How to make simple Arduino RGB Led strip VU Meter

Despite the many options and customization possibilities, this device is extremely simple to build, and contains a minimal number of components.

Dec 19, 2024

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Components and supplies

Adressable WS2812B RGB LED light strip

Arduino Nano

micro switch

10kOhm potentiometer

Push Button

Resistor 10k

Tools and machines

Soldering kit

Apps and platforms

Arduino IDE

Project description

Code

Code vu

cpp

...

1/*
2**********************************************************************
3* Stereo VU Meter for 1 or 2 LED rings or strips build by ericBcreator
4* Designed to be used with an Arduino UNO, Nano or compatible device.
5**********************************************************************
6* Notice: search for @EB in the Sketch for important variables to set
7* for the Sketch to work with your setup.
8**********************************************************************
9* Last updated 20180202 by ericBcreator
10*
11* This code is free for personal use, not for commercial purposes.
12* Please leave this header intact.
13*
14* contact: ericBcreator@gmail.com
15**********************************************************************
16*/
17#include <Adafruit_NeoPixel.h>
18#define nonLinearLogAudio 
19
20//#define led_strip_60                                    //uncomment this if you are using a single 60 LED strip (Center to sides mode)
21#define led_2_strip_60                                  //uncomment this if you are using two 60 LED strips (Left-Right bottom to top mode)
22
23//#define led_strip_30                                    //uncomment this if you are using a single 30 LED strip
24//#define led_2_strip_30                                  //uncomment this if you are using two 30 LED strips
25
26//#define led_strip_144                                   //uncomment this if you are using a single 144 LED strip
27//#define led_2_strip_144                                 //uncomment this if you are using two 144 LED strips
28
29const int useSensorValues = true;                         // @EB
30
31
32//
33// setup pins
34//
35
36int leftPin = A0, rightPin = A1;                          // left audio in on analog 0, right on analog 1
37int brightnessPin = A4, sensitivityPin = A5;              // potentiometers for brightness and sensitivity on analog 4 and 5
38int leftStripPin = 5;                                     // DIN of left led strip on digital pin 5
39int rightStripPin = 6;                                    // DIN of right led strip on digital pin 6
40int showPeaksPin = 7;                                     // switch to toggle peaks on or off on digital pin 7 (7, 9 for box version)
41int showPeaksMomentarySwitch = false;                     // set false for an on/off toggle switch
42int reverseShowPeaks = true;                              // reverses the on/off setting in case you made a wiring mistake ;-) @EB
43int selectButton1Pin = 8;                                 // push button for changing settings on digital pin 8
44int useSelectButton1 = true;                              // set to false if no push button1 for selecting the color scheme is connected  @EB
45int selectButton2Pin = 9;                                 // push button for changing settings on digital pin 9
46int useSelectButton2 = true;                              // set to false if no push button2 is connected  @EB
47
48
49#if defined (led_strip_60)
50  //settings for a 60 led strip
51
52  int stripNumOfLeds = 60;                                  // the total number of leds
53  int stripsOn2Pins = false;                                // set to true if the LED strips or rings are connected to 2 input pins
54  uint32_t stripColor[31];                                  // half of the number of leds + 1
55  int displayMiddleLed = true;                              // display the middle led (blue). set to true for one strip, false for two strips or rings
56  int splitStrip = false;                                   // set to true when using 2 strips or rings, false for one strip
57  int middleOffset = 1;                                     // offset for the middle led when using one strip
58  int startupAnimationDelay = 6;                            // delay for the startup animation
59  int orangeLimitAmount = 0;                                // limit the amount of green of the middle LEDs to make them more orange
60  int swapLeftRight = false;                                // swap the left and right input values or not
61  
62  int dropDelay = 5;                                        // hold time before dropping the leds
63  float dropFactor = .94;                                   // value for dropping the leds
64  
65  int peakTimeNoDropDelay = 250;                            // peak hold time when not dropping the peaks (when droppingPeak is false)
66  int peakTimeFirstDropDelay = 70;                          // peak hold time when dropping the first peak
67  int peakTimeDropDelay = 7;                                // peak hold time when dropping the rest of the peaks
68  float peakDropFactor = .94;                               // value for dropping the peaks
69  int droppingPeakFade = false;                             // display the dropping peak fading to black or not
70  
71  int bouncingPeaksNumOfLeds = 6;                           // how many leds to bounce up (max)
72  int bouncingPeaksNumOfLedsMin = 3;                        // how many leds to bounce up (min) when using dynamicBouncingPeaks
73  int bouncingPeakDelay = 4;                                // delay between peak bounce updates
74  int bouncingPeakCounterInc = 10;                          // increase counter for each bounce update. note: it uses a 0-180 sin function for the bouncing
75
76#elif defined (led_2_strip_60)
77  //settings for 2 60 led strips
78
79  int stripNumOfLeds = 60;
80  int stripsOn2Pins = true;
81  uint32_t stripColor[61];
82  int displayMiddleLed = false;
83  int splitStrip = true;
84  int middleOffset = 0;
85  int startupAnimationDelay = 1;
86  int orangeLimitAmount = 0;
87  int swapLeftRight = false;
88  
89  int dropDelay = 5;
90  float dropFactor = .94;
91  
92  int peakTimeNoDropDelay = 250;
93  int peakTimeFirstDropDelay = 70;
94  int peakTimeDropDelay = 7;
95  float peakDropFactor = .94;
96  int droppingPeakFade = false;
97  
98  int bouncingPeaksNumOfLeds = 12;
99  int bouncingPeaksNumOfLedsMin = 4;
100  int bouncingPeakDelay = 4;
101  int bouncingPeakCounterInc = 10;
102  
103#elif defined (led_strip_30)
104  //settings for a 30 led strip
105
106  int stripNumOfLeds = 30;                                  // the total number of leds
107  int stripsOn2Pins = false;                                // set to true if the LED strips or rings are connected to 2 input pins
108  uint32_t stripColor[16];                                  // half of the number of leds + 1
109  int displayMiddleLed = true;                              // display the middle led (blue). set to true for one strip, false for two strips or rings
110  int splitStrip = false;                                   // set to true when using 2 strips or rings, false for one strip
111  int middleOffset = 1;                                     // offset for the middle led when using one strip
112  int startupAnimationDelay = 10;                           // delay for the startup animation
113  int orangeLimitAmount = 0;                                // limit the amount of green of the middle LEDs to make them more orange
114  int swapLeftRight = false;                                // swap the left and right input values or not
115  
116  int dropDelay = 10;                                       // hold time before dropping the leds
117  float dropFactor = .9;                                    // value for dropping the leds
118  
119  int peakTimeNoDropDelay = 250;                            // peak hold time when not dropping the peaks (set droppingPeak true or false)
120  int peakTimeFirstDropDelay = 150;                         // peak hold time when dropping the first peak
121  int peakTimeDropDelay = 15;                               // peak hold time when dropping the rest of the peaks
122  float peakDropFactor = .94;                               // value for dropping the peaks
123  int droppingPeakFade = false;                             // display the dropping peak fading to black or not
124  
125  int bouncingPeaksNumOfLeds = 4;                           // how many leds to bounce up (max)
126  int bouncingPeaksNumOfLedsMin = 2;                        // how many leds to bounce up (min) when using dynamicBouncingPeaks
127  int bouncingPeakDelay = 4;                                // delay between peak bounce updates
128  int bouncingPeakCounterInc = 9;                           // increase counter for each bounce update. note: it uses a 0-180 sin function for the bouncing
129
130#elif defined (led_2_strip_30)
131  //settings for 2 30 led strips
132
133  int stripNumOfLeds = 30;
134  int stripsOn2Pins = true;
135  uint32_t stripColor[31];
136  int displayMiddleLed = false;
137  int splitStrip = true;
138  int middleOffset = 0;
139  int startupAnimationDelay = 1;
140  int orangeLimitAmount = 0;
141  int swapLeftRight = false;
142  
143  int dropDelay = 5;
144  float dropFactor = .94;
145  
146  int peakTimeNoDropDelay = 250;
147  int peakTimeFirstDropDelay = 70;
148  int peakTimeDropDelay = 7;
149  float peakDropFactor = .94;
150  int droppingPeakFade = false;
151  
152  int bouncingPeaksNumOfLeds = 12;
153  int bouncingPeaksNumOfLedsMin = 4;
154  int bouncingPeakDelay = 4;
155  int bouncingPeakCounterInc = 10;
156  
157#elif defined (led_strip_144)
158  //settings for a 144 led strip
159
160  int stripNumOfLeds = 145;
161  int stripsOn2Pins = false;
162  uint32_t stripColor[73];
163  int displayMiddleLed = true;
164  int splitStrip = false;
165  int middleOffset = 1;
166  int startupAnimationDelay = 1;
167  int orangeLimitAmount = 0;
168  int swapLeftRight = false;
169  
170  int dropDelay = 4;
171  float dropFactor = .92;
172  
173  int peakTimeNoDropDelay = 250;
174  int peakTimeFirstDropDelay = 100;
175  int peakTimeDropDelay = 5;
176  float peakDropFactor = .94;
177  int droppingPeakFade = false;
178  
179  int bouncingPeaksNumOfLeds = 10;
180  int bouncingPeaksNumOfLedsMin = 4;
181  int bouncingPeakDelay = 2;
182  int bouncingPeakCounterInc = 10;
183
184#elif defined (led_2_strip_144)
185  //settings for 2 144 led strips
186
187  int stripNumOfLeds = 144;
188  int stripsOn2Pins = true;
189  uint32_t stripColor[145];
190  int displayMiddleLed = false;
191  int splitStrip = true;
192  int middleOffset = 0;
193  int startupAnimationDelay = 1;
194  int orangeLimitAmount = 0;
195  int swapLeftRight = false;
196  
197  int dropDelay = 5;
198  float dropFactor = .94;
199  
200  int peakTimeNoDropDelay = 250;
201  int peakTimeFirstDropDelay = 70;
202  int peakTimeDropDelay = 7;
203  float peakDropFactor = .94;
204  int droppingPeakFade = false;
205  
206  int bouncingPeaksNumOfLeds = 12;
207  int bouncingPeaksNumOfLedsMin = 4;
208  int bouncingPeakDelay = 4;
209  int bouncingPeakCounterInc = 10;
210  
211#endif
212//
213// setup other user variables
214//
215
216// basic settings
217int pulsing = false;                                       // pulsing will display from the middle of each strip or ring  @EB
218
219int spinCircle = false;                                    // spin the animation. will not work with stripsOn2Pins  @EB
220
221int animType = 0;                                         // startup animation selection (1 looks nice for 1 ring)  @EB
222int colorScheme = 10;                                     // 0: green-red, 1: blue-green, 2: blue-red, 3: red-blue, 4: green-blue, 5: red-green, 6: blue-white-red
223                                                          // 7: red-white-blue, 8: green-white-red, 9: green-white-blue, 10: color wheel, 11: spinning color wheel,
224                                            // 12: as 11 but spread with factor colorScheme12Factor  @EB
225int maxColorScheme = 12;                                  // used for looping through the color schemes with the switch button
226int colorScheme11SpinDelay = stripNumOfLeds / 4 ;         // delay for spinning scheme 11
227int colorScheme12Factor = 3;                              // wheel spread factor for scheme 12 @EB
228
229int minValue = 10;                                        // min analog input value
230int sensitivityValue = 110;                               // 0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
231
232#ifdef highLevelInput
233  int maxValue = 700;                                     // max analog input value (0-1023 equals 0-5V). try 300 for low level input, 700 for high
234  int maxSensitivity = 2 * 255;                           // set to a higher setting to amplify low input levels. try 4 * 255 for low level input, 2 * 255 for high
235#else
236  int maxValue = 300;                                     // max analog input value (0-1023 equals 0-5V). try 300 for low level input, 700 for high
237  int maxSensitivity = 4 * 255;                           // set to a higher setting to amplify low input levels. try 4 * 255 for low level input, 2 * 255 for high
238#endif
239
240int ledBrightness = 30;                                   // 0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
241int sensorDeviationBrightness = 3;                        // eliminate fluctuating values
242int overflowDelay = 10;                                   // overflow hold time
243
244// peak settings @EB
245int displayPeaks = false;                                 // value will be set by the switch if useSensorValues = true
246int displayTopAsPeak = true;                              // always display the top LED in peak color
247int droppingPeak = true;                                  // display dropping peaks or not. note: displayPeaks has to be true 
248int bouncingPeaks = false;                                // display bouncing peaks or not. note: displayPeaks has to be true 
249int dynamicBouncingPeaks = false;                         // bounce less with lower peaks. note: bouncingPeaks has to be true 
250
251//
252// initialize other variables 
253//
254
255int numOfSegments, halfNumOfSegments, stripMiddle, maxDisplaySegments;
256float sensitivityFactor;
257float nonLinearResponseFactor;
258
259int brightnessValue, prevBrightnessValue;
260float ledFactor, ledFactor_div_numOfSegments;
261
262uint32_t stripMiddleColor, stripOverflowColor, stripHoldColor;
263uint32_t colorValue;
264
265int leftValue = 0, rightValue = 0, maxReadValue = 0;
266int leftValueN = 0, rightValueN = 0;
267int leftAnalogValue = 0, rightAnalogValue = 0;
268float log10MaxDisplaySegments;
269
270int prevLeftValue = 0, prevRightValue = 0;
271int prevLeftAnalogValue = 0, prevRightAnalogValue = 0;
272
273int selectButton1PinState = 0, prevSelectButton1PinState = 0;
274int selectButton2PinState = 0, prevSelectButton2PinState = 0;
275
276int selectButton1PinSetting = colorScheme;
277int selectButton2PinSetting = 0;
278
279int i, j;
280int dropLeft, dropRight;
281int leftDropTime, rightDropTime;
282
283int leftPeak = 0, rightPeak = 0;
284int leftPeakTime = 0, rightPeakTime = 0;
285int leftFirstPeak = true, rightFirstPeak = true;
286int showPeaksPinSetting, prevShowPeaksPinSetting;
287
288int stripPulseMiddle = 0;
289int halfLeftValue, halfRightValue, halfPrevLeftValue, halfPrevRightValue;
290
291int leftPeakBouncing = false, rightPeakBouncing = false;
292int leftPeakBounce = 0, rightPeakBounce = 0;
293int prevLeftPeakBounce = 0, prevRightPeakBounce = 0;
294int leftPeakBounceCounter = 0, rightPeakBounceCounter = 0;
295int leftPeakBounceDelayCounter = 0, rightPeakBounceDelayCounter = 0;
296int leftBouncingPeaksNumOfLeds = 0, rightBouncingPeaksNumOfLeds = 0;
297float bounceFactor;
298
299int colorScheme11SpinValue = 0, colorScheme11SpinDelayValue = 0;
300int colorSchemeFactor = 1;
301long selectButton1Timer;
302
303int spinDelayCounter = 0, spinCounter = 0, spinTurnsCounter = 0, spinTurnsMax = 0, spinTurnsDelay = 0, spinTurnsDelayMax = 0;
304int spinCounterInc = 1;
305int spinDelay = 0;
306//
307// initialize the strip or rings
308//
309
310Adafruit_NeoPixel left_strip = Adafruit_NeoPixel(stripNumOfLeds, leftStripPin, NEO_GRB + NEO_KHZ800);
311Adafruit_NeoPixel right_strip = Adafruit_NeoPixel(stripNumOfLeds, rightStripPin, NEO_GRB + NEO_KHZ800);
312
313//
314// setup
315//
316
317void setup() {
318  #ifdef DEBUG
319    Serial.begin(9600);
320  #endif
321
322  randomSeed(analogRead(2));
323
324  if (stripsOn2Pins) {
325    numOfSegments = stripNumOfLeds;
326    maxDisplaySegments = numOfSegments - 1;
327    
328    stripMiddle = stripNumOfLeds;
329    stripPulseMiddle = stripMiddle / 2;
330    spinCircle = false;
331  }
332  else {
333    numOfSegments = stripNumOfLeds / 2;
334    stripMiddle = stripNumOfLeds / 2;
335    maxDisplaySegments = stripMiddle - 1;
336
337    stripPulseMiddle = stripMiddle / 2;
338  }
339
340  halfNumOfSegments = numOfSegments / 2; 
341  bounceFactor = (float) bouncingPeaksNumOfLeds / (maxDisplaySegments - bouncingPeaksNumOfLeds);
342  nonLinearResponseFactor = 90 / (float) maxDisplaySegments;
343  log10MaxDisplaySegments = log10(maxDisplaySegments);
344
345  pinMode(showPeaksPin, INPUT);    
346  
347  if (useSelectButton1)
348    pinMode(selectButton1Pin, INPUT);  
349
350  left_strip.begin();
351  if (stripsOn2Pins) 
352    right_strip.begin();
353
354  if (useSensorValues) {
355    readSensorValues();
356    setInitialDisplayPeaks();
357  }
358  else {
359    setStripColors();
360    setSensitivityFactor();
361  }
362
363  #ifdef DEBUG_TEST_LEDS
364    displayTest();
365  #endif
366
367  startupAnimation();
368}
369
370//
371// main loop
372//
373
374void loop() {
375  #ifdef DEBUG_PRINT_LOOP_TIME
376    long time = millis();
377  #endif
378
379
380  if (useSensorValues) 
381    readSensorValues();
382  
383  readValues();
384
385  #if defined (DEBUG_NO_PEAKS)
386    displayPeaks = false;
387  #endif
388
389  #if defined (DEBUG_PEAKS)
390    displayPeaks = true;
391  #endif
392
393  if (pulsing) {
394    drawPulsingValues();
395  }
396  else {
397    drawValues();
398    if (displayPeaks) {
399      getPeaks();
400      drawPeaks();
401    }
402  }
403
404  left_strip.show();
405  if (stripsOn2Pins)
406    right_strip.show();
407    
408  storePrevValues();
409
410  checkSpinCircle();
411
412  #ifdef DEBUG_PRINT_LOOP_TIME
413    time = millis() - time;
414    Serial.println(time);
415  #endif
416}
417
418// 
419// functions
420//
421
422void setInitialDisplayPeaks() {
423  #if !defined (DEBUG_NO_PEAK_SWITCH)
424    showPeaksPinSetting = digitalRead(showPeaksPin);
425  
426    if (showPeaksPinSetting == HIGH)
427      displayPeaks = false;
428  #endif 
429 
430  if (reverseShowPeaks) {
431    if (!displayPeaks)
432      displayPeaks = true;
433    else
434      displayPeaks = false;
435  }
436  
437  prevShowPeaksPinSetting = showPeaksPinSetting;
438}
439
440void readSensorValues() {
441  //
442  // peaks pin
443  //
444
445  #if !defined (DEBUG_NO_PEAK_SWITCH)
446    showPeaksPinSetting = digitalRead(showPeaksPin);
447  
448    if (showPeaksMomentarySwitch) {
449      if (showPeaksPinSetting == LOW && prevShowPeaksPinSetting == HIGH) {
450        if (displayPeaks == true) {
451          displayPeaks = false;
452          clearLeftPeak();
453          clearRightPeak();        
454          if (showPeaksMomentarySwitch)
455            while (digitalRead(showPeaksPin) == LOW) {}
456        }
457        else {
458          displayPeaks = true;
459        }
460      }
461    } 
462    else {
463      if (reverseShowPeaks) {
464        if (showPeaksPinSetting == HIGH && prevShowPeaksPinSetting == LOW) 
465          displayPeaks = true;
466        else if (showPeaksPinSetting == LOW && prevShowPeaksPinSetting == HIGH) {
467          displayPeaks = false;
468          clearLeftPeak();
469          clearRightPeak();        
470        }
471      }
472      else {    
473        if (showPeaksPinSetting == LOW && prevShowPeaksPinSetting == HIGH) 
474          displayPeaks = true;
475        else if (showPeaksPinSetting == HIGH && prevShowPeaksPinSetting == LOW) {
476          displayPeaks = false;
477          clearLeftPeak();
478          clearRightPeak();        
479        }
480      }
481    }
482    if (pulsing) {
483      if (displayPeaks)
484        displayTopAsPeak = true;
485      else
486        displayTopAsPeak = false;
487    }
488
489    prevShowPeaksPinSetting = showPeaksPinSetting;
490  #endif
491  
492
493  //
494  // selectButtonPin 1 and 2
495  //
496  if (useSelectButton1) {      
497    selectButton1PinState = digitalRead(selectButton1Pin);
498    
499    if (selectButton1PinState == HIGH && prevSelectButton1PinState == LOW)
500      selectButton1Timer = millis();
501      
502    if (selectButton1PinState == HIGH && prevSelectButton1PinState == HIGH) {
503      if ((millis() - selectButton1Timer) > 1000) {
504        pulsing = !pulsing;
505        setStripColors();
506        displayNumber(colorScheme, 250);
507
508        while (digitalRead(selectButton1Pin) == HIGH) {}
509        selectButton1PinState = LOW;
510        clearValues();
511      }
512    }
513    else if (selectButton1PinState == LOW && prevSelectButton1PinState == HIGH) {
514      selectButton1PinSetting++;
515      if (selectButton1PinSetting > maxColorScheme) {
516        selectButton1PinSetting = 0;
517      }
518      colorScheme = selectButton1PinSetting;
519
520      if (colorScheme == 12)
521        colorScheme11SpinValue = (colorScheme11SpinValue * colorScheme12Factor);
522
523      setStripColors();
524      displayNumber(colorScheme, 250);
525    }
526    prevSelectButton1PinState = selectButton1PinState;
527  }
528
529  if (useSelectButton2) {
530    selectButton2PinState = digitalRead(selectButton2Pin);
531    
532    if (selectButton2PinState == HIGH && prevSelectButton2PinState == LOW) {
533      selectButton2PinSetting++;
534      
535      switch(selectButton2PinSetting) {
536        case 0:
537        case 1: {   
538          pulsing = true;
539          spinCircle = false;
540          break;
541        }
542        case 2: {
543          pulsing = true;
544          spinCircle = true;
545          break;
546        }
547        case 3: {
548          pulsing = false;
549          spinCircle = false;
550          selectButton2PinSetting = 0;
551          break;
552        }
553      }
554      
555      setStripColors();
556      displayNumber(colorScheme, 250);
557    }
558    
559    prevSelectButton2PinState = selectButton2PinState;
560  }
561  
562  //
563  // brightness
564  //
565  brightnessValue = analogRead(brightnessPin);
566  brightnessValue = map(brightnessValue, 0, 1023, 0, 255);
567  
568  if (abs(brightnessValue - prevBrightnessValue) > sensorDeviationBrightness) {
569    ledBrightness = brightnessValue;
570    setStripColors();
571    prevBrightnessValue = brightnessValue;
572  }
573
574  //
575  // colorscheme 11 spinning wheel
576  //
577
578  if (colorScheme == 11 || colorScheme == 12) {
579    colorScheme11SpinDelayValue++;
580    if (colorScheme11SpinDelayValue == colorScheme11SpinDelay) {
581      colorScheme11SpinDelayValue = 0;
582      colorScheme11SpinValue++;
583      if (colorScheme11SpinValue > maxDisplaySegments * colorSchemeFactor)
584        colorScheme11SpinValue = 0;
585      setStripColors();
586    }
587  }
588
589  //
590  // sensitivity
591  //
592  sensitivityValue = analogRead(sensitivityPin);
593  sensitivityValue = map(sensitivityValue, 0, 1023, 0, 255);
594  setSensitivityFactor();
595}
596
597void setSensitivityFactor() {
598  //sensitivityValue_div_numOfSegments = sensitivityValue / numOfSegments;
599  sensitivityFactor = ((float) sensitivityValue / 255 * (float) maxSensitivity / 255);
600}
601
602void readValues() {
603  #ifdef averageReadings
604    leftAnalogValue = 0;
605    rightAnalogValue = 0;
606    
607    for (i = 0; i <= averageNumOfReadings; i++) {
608      leftAnalogValue += analogRead(leftPin);
609      rightAnalogValue += analogRead(rightPin);
610    }
611
612    leftAnalogValue /= averageNumOfReadings;
613    rightAnalogValue /= averageNumOfReadings;
614    
615  #else  
616    leftAnalogValue = analogRead(leftPin);
617    rightAnalogValue = analogRead(rightPin);
618  #endif
619
620  if (swapLeftRight) {
621    int tempValue = leftAnalogValue;
622    leftAnalogValue = rightAnalogValue;
623    rightAnalogValue = tempValue;
624  }
625
626  if (leftAnalogValue < prevLeftAnalogValue) {
627    leftDropTime++;
628    if (leftDropTime > dropDelay) {
629      leftAnalogValue = prevLeftAnalogValue * dropFactor;
630      leftDropTime = 0;
631    }
632    else
633      leftAnalogValue = prevLeftAnalogValue;
634  }
635   
636  if (rightAnalogValue < prevRightAnalogValue) {
637    rightDropTime++;
638    if (rightDropTime > dropDelay) {
639      rightAnalogValue = prevRightAnalogValue * dropFactor;
640      rightDropTime = 0;
641    }
642    else
643      rightAnalogValue = prevRightAnalogValue;
644  }
645
646  #ifdef DEBUG_PRINT_ANALOGVALUES
647    Serial.print(leftAnalogValue);
648    Serial.print(" ");
649    Serial.println(rightAnalogValue);
650  #endif  
651
652  // map values  
653  leftValue = map(leftAnalogValue * sensitivityFactor, minValue, maxValue, 0, maxDisplaySegments);
654  rightValue = map(rightAnalogValue * sensitivityFactor, minValue, maxValue, 0, maxDisplaySegments);
655  
656  // if defined, convert to (reverse) non linear response
657  boolean flagNonLinear = false;
658  
659  #if defined (nonLinearSinAudio)
660    flagNonLinear = true;
661    leftValueN = ((sin(((leftValue * nonLinearResponseFactor) + 270) * 0.0174533) + 1) * maxDisplaySegments);
662    rightValueN = ((sin(((rightValue * nonLinearResponseFactor) + 270) * 0.0174533) + 1) * maxDisplaySegments);
663    
664  #elif defined (nonLinearReverseSinAudio)
665    flagNonLinear = true;
666    leftValueN = ((sin(((leftValue * nonLinearResponseFactor)) * 0.0174533)) * maxDisplaySegments);
667    rightValueN = ((sin(((rightValue * nonLinearResponseFactor)) * 0.0174533)) * maxDisplaySegments);
668
669  #elif defined (nonLinearLogAudio)
670    flagNonLinear = true;
671    leftValueN = ((log10(leftValue  + 1) / log10MaxDisplaySegments * maxDisplaySegments));
672    rightValueN = ((log10(rightValue  + 1) / log10MaxDisplaySegments * maxDisplaySegments));
673  
674  #endif
675  
676  if (flagNonLinear == true) {
677    #if defined (nonLinearAvr2)
678      leftValue = (leftValue + leftValueN) / 2;
679      rightValue = (rightValue + rightValueN) / 2;
680    #else
681      leftValue = leftValueN;
682      rightValue = rightValueN;
683    #endif
684  }
685  
686// @EB_DEBUG
687
688  #ifdef displayOverflow
689    #ifdef compressOverflowPeaks
690      for (i = 1; i <= compressOverflowNumOfTimes; i++) {
691        if (leftValue > maxDisplaySegments) {
692//          Serial.print(i);    
693//          Serial.print("  ");
694//          Serial.print(leftValue);    
695//          Serial.print("  ");
696          leftValue = leftValue - leftValue * compressOverflowFactor * i;
697//          Serial.print(leftValue);
698//          Serial.print("  ");
699//          Serial.println(maxDisplaySegments);
700        }
701      }
702    #endif
703  #endif
704  
705  if (leftValue > maxDisplaySegments) {      
706    leftValue = maxDisplaySegments;
707    #ifdef displayOverflow
708      drawOverflow();
709    #endif
710  }
711
712  #ifdef displayOverflow
713    #ifdef compressOverflowPeaks
714      if (rightValue > maxDisplaySegments)
715        rightValue = rightValue - rightValue * compressOverflowFactor;
716    #endif
717  #endif
718  
719  if (rightValue > maxDisplaySegments) {
720    rightValue = maxDisplaySegments;
721    #ifdef displayOverflow
722      drawOverflow();
723    #endif
724  }
725}
726
727void storePrevValues() {
728  prevLeftAnalogValue = leftAnalogValue;
729  prevRightAnalogValue = rightAnalogValue;
730
731  prevLeftValue = leftValue;
732  prevRightValue = rightValue;
733}
734
735void getPeaks() {
736  if (leftValue > leftPeak) {
737    if (dynamicBouncingPeaks || prevLeftPeakBounce > 0)
738      clearLeftBouncePeak();
739          
740    leftPeak = leftValue;
741    leftPeakTime = 0;
742    leftFirstPeak = true;
743
744    if (bouncingPeaks) {
745      leftPeakBouncing = true;
746      leftPeakBounceCounter = 0;
747      leftPeakBounceDelayCounter = 0;
748      
749      if (dynamicBouncingPeaks)
750        leftBouncingPeaksNumOfLeds = max(bouncingPeaksNumOfLedsMin, (leftPeak * bounceFactor));
751      else
752        leftBouncingPeaksNumOfLeds = bouncingPeaksNumOfLeds;
753    }
754  }
755  else {
756    leftPeakTime++;
757    if (droppingPeak) {
758      if (leftFirstPeak) {
759        if (leftPeakTime > peakTimeFirstDropDelay) {
760          clearLeftPeak();
761          leftFirstPeak = false;
762        }
763      }
764      else {
765        if (leftPeakTime > peakTimeDropDelay) {
766          clearLeftPeak();
767        }
768      }
769    }
770    else {
771      if (leftPeakTime > peakTimeNoDropDelay) {
772        clearLeftPeak();
773      }
774    }
775  }
776
777  if (leftPeakBouncing) {
778    if (leftFirstPeak) {
779      leftPeakBounceDelayCounter++;
780      if (leftPeakBounceDelayCounter >= bouncingPeakDelay) {
781        leftPeakBounceDelayCounter = 0;
782        leftPeakBounceCounter += bouncingPeakCounterInc;
783        if (leftPeakBounceCounter >= 180) {
784          clearLeftBouncePeak();
785          clearLeftBounce();
786        }
787        else {        
788          leftPeakBounce = min((sin(leftPeakBounceCounter * 0.0174533) * leftBouncingPeaksNumOfLeds), (maxDisplaySegments - leftPeak));
789          if (leftPeakBounce != prevLeftPeakBounce) {
790            clearLeftBouncePeak();
791          }
792          prevLeftPeakBounce = leftPeakBounce;
793        }
794      }
795    }
796  }
797
798  if (rightValue > rightPeak) {
799    if (dynamicBouncingPeaks || prevRightPeakBounce > 0)
800      clearRightBouncePeak();
801
802    rightPeak = rightValue;
803    rightPeakTime = 0;
804    rightFirstPeak = true;
805
806    if (bouncingPeaks) {
807      rightPeakBouncing = true;
808      rightPeakBounceCounter = 0;
809      rightPeakBounceDelayCounter = 0;
810
811      if (dynamicBouncingPeaks)
812        rightBouncingPeaksNumOfLeds = max(bouncingPeaksNumOfLedsMin, (rightPeak * bounceFactor));
813      else
814        rightBouncingPeaksNumOfLeds = bouncingPeaksNumOfLeds;
815    }
816  }
817  else {
818    rightPeakTime++;
819    if (droppingPeak) {
820      if (rightFirstPeak) {
821        if (rightPeakTime > peakTimeFirstDropDelay) {
822          clearRightPeak();
823          rightFirstPeak = false;
824        }
825      }
826      else {
827        if (rightPeakTime > peakTimeDropDelay)
828          clearRightPeak();
829      }
830    }
831    else {
832      if (rightPeakTime > peakTimeNoDropDelay)
833        clearRightPeak();
834    }
835  }
836
837  if (rightPeakBouncing) {
838    if (rightFirstPeak) {
839      rightPeakBounceDelayCounter++;
840      if (rightPeakBounceDelayCounter >= bouncingPeakDelay) {
841        rightPeakBounceDelayCounter = 0;
842        rightPeakBounceCounter += bouncingPeakCounterInc;
843  
844        if (rightPeakBounceCounter >= 180) {
845          clearRightBouncePeak();
846          clearRightBounce();
847        }
848        else {        
849          rightPeakBounce = min((sin(rightPeakBounceCounter * 0.0174533) * rightBouncingPeaksNumOfLeds), (maxDisplaySegments - rightPeak));
850          if (rightPeakBounce != prevRightPeakBounce) {
851            clearRightBouncePeak();
852          }
853          prevRightPeakBounce = rightPeakBounce;
854        }
855      }
856    }
857  }
858}
859
860void checkSpinCircle () {
861  if (spinCircle) {
862    if (spinTurnsMax == 0) {
863      spinTurnsMax = random(stripNumOfLeds / 4, stripNumOfLeds * 3);  // spin at least a quarter turn, max 3 turns
864      
865      if (random(10) > 4)
866        spinCounterInc = -spinCounterInc;
867      
868      spinTurnsDelayMax = random(100, 1000); // @EB_DEBUG
869
870      spinDelay = random(20, 75); // @EB_DEBUG
871    }
872
873    if (spinTurnsCounter == spinTurnsMax) {
874      spinTurnsDelay++;
875      if (spinTurnsDelay == spinTurnsDelayMax) {
876        spinTurnsDelay = 0;
877        spinTurnsCounter = 0;
878        spinTurnsMax = 0;
879      }
880    }
881    else {
882      spinDelayCounter++;
883  
884      if (spinDelayCounter > spinDelay) {
885        clearZeroAndPeaks();
886
887        spinCounter += spinCounterInc;
888        if (spinCounter > stripNumOfLeds)
889          spinCounter = 0;
890        else if (spinCounter < 0)
891          spinCounter = stripNumOfLeds;
892
893        spinTurnsCounter++;
894        spinDelayCounter = 0;
895      }
896    }
897  }
898}
899
900int getSpinCircleValue(int value) {
901  if (!spinCircle)
902   return value;
903  else {
904    int calcValue = value + spinCounter;
905    if (calcValue >= stripNumOfLeds)
906      calcValue -= stripNumOfLeds;
907    return calcValue;
908  }
909}
910
911void drawValues() {
912  if (splitStrip) {
913    for (i = middleOffset; i < leftValue; i++)
914      left_strip.setPixelColor(getSpinCircleValue(i), stripColor[i]);
915
916    if (!displayPeaks && displayTopAsPeak)
917      left_strip.setPixelColor(getSpinCircleValue(leftValue), stripHoldColor);
918
919    for (i = prevLeftValue; i >= leftValue; i--)
920      left_strip.setPixelColor(getSpinCircleValue(i), 0);
921
922    if (stripsOn2Pins) {
923      for (i = middleOffset; i < rightValue; i++) 
924        right_strip.setPixelColor(i, stripColor[i]);
925
926      if (!displayPeaks && displayTopAsPeak)
927        right_strip.setPixelColor(rightValue, stripHoldColor);
928
929      for (i = prevRightValue; i >= rightValue; i--)
930        right_strip.setPixelColor(i, 0);
931    }
932    else {
933      for (i = middleOffset; i < rightValue; i++)
934        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), stripColor[i]);
935
936      if (!displayPeaks && displayTopAsPeak)
937        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + rightValue), stripHoldColor);
938        
939      for (i = prevRightValue; i >= rightValue; i--)
940        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), 0);
941    }
942  }
943  else {
944    for (i = middleOffset; i < leftValue; i++)
945      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), stripColor[i]);
946
947    if (!displayPeaks && displayTopAsPeak)
948      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + leftValue), stripHoldColor);
949
950    for (i = prevLeftValue; i >= leftValue; i--)
951      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), 0);
952  
953    for (i = middleOffset; i < rightValue; i++)
954      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - i), stripColor[i]);
955
956    if (!displayPeaks && displayTopAsPeak)
957      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - rightValue), stripHoldColor);
958
959    for (i = prevRightValue; i >= rightValue; i--)
960      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - i), 0);
961  }
962
963  if (displayMiddleLed) 
964    left_strip.setPixelColor(getSpinCircleValue(stripMiddle), stripMiddleColor);
965}
966
967void drawPulsingValues() {
968  halfLeftValue = (leftValue + 1) / 2;
969  halfRightValue = (rightValue + 1) / 2;
970  halfPrevLeftValue = (prevLeftValue + 1)/ 2;
971  halfPrevRightValue = (prevRightValue + 1) / 2;
972  
973  if (splitStrip) {
974    for (i = 0; i < halfLeftValue; i++) {
975      colorValue = stripColor[i * 2];
976      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + i), colorValue);
977      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - i), colorValue);
978    }
979
980    if (displayTopAsPeak) {
981      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + halfLeftValue), stripHoldColor);
982      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - halfLeftValue), stripHoldColor);
983    }
984
985    for (i = halfPrevLeftValue; i >= halfLeftValue; i--) {
986      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + i), 0);
987      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - i), 0);
988    }
989
990    if (stripsOn2Pins) {
991      for (i = 0; i < halfRightValue; i++) {
992        colorValue = stripColor[i * 2];
993        right_strip.setPixelColor((stripPulseMiddle + i), colorValue);
994        right_strip.setPixelColor((stripPulseMiddle - i), colorValue);
995      }
996
997      if (displayTopAsPeak) {
998        right_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + halfRightValue), stripHoldColor);
999        right_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - halfRightValue), stripHoldColor);
1000      }
1001      
1002      for (i = halfPrevRightValue; i >= halfRightValue; i--) {
1003        right_strip.setPixelColor((stripPulseMiddle + i), 0);
1004        right_strip.setPixelColor((stripPulseMiddle - i), 0);
1005      }
1006    }
1007    else {
1008      for (i = 0; i < halfRightValue; i++) {
1009        colorValue = colorValue = stripColor[i * 2];
1010        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + i), colorValue);
1011        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - i), colorValue);
1012      }
1013
1014      if (displayTopAsPeak) {
1015        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + halfRightValue), stripHoldColor);
1016        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - halfRightValue), stripHoldColor);
1017      }
1018
1019      for (i = halfPrevRightValue; i >= halfRightValue; i--) {
1020        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + i), 0);
1021        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - i), 0);
1022      }
1023    }
1024  }
1025  else {
1026    for (i = 0; i < halfLeftValue; i++) {
1027      colorValue = colorValue = stripColor[i * 2];
1028      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + i), colorValue);
1029      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - i), colorValue);
1030    }
1031
1032    if (displayTopAsPeak) {
1033      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + halfLeftValue), stripHoldColor);
1034      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - halfLeftValue), stripHoldColor);
1035    }
1036    
1037    for (i = halfPrevLeftValue; i >= halfLeftValue; i--) {
1038      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + i), 0);
1039      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - i), 0);
1040    }
1041  
1042    for (i = 0; i < halfRightValue; i++) {
1043      colorValue = colorValue = stripColor[i * 2];
1044      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle + i)), colorValue);
1045      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle - i)), colorValue);
1046    }
1047
1048    if (displayTopAsPeak) {
1049      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle + halfRightValue)), stripHoldColor);
1050      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle - halfRightValue)), stripHoldColor);
1051    }
1052    
1053    for (i = halfPrevRightValue; i >= halfRightValue; i--) {
1054      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle + i)), 0);
1055      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle - i)), 0);
1056    }
1057  }
1058
1059  if (displayMiddleLed) {
1060    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - stripPulseMiddle), stripMiddleColor);
1061    left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle), stripMiddleColor);
1062  }
1063}
1064
1065void clearZeroAndPeaks() {
1066  left_strip.setPixelColor(getSpinCircleValue(middleOffset), 0);
1067  left_strip.setPixelColor(getSpinCircleValue(stripMiddle), 0);
1068
1069  if (displayTopAsPeak) {
1070    if (splitStrip) {
1071      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + halfLeftValue), 0);
1072      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - halfLeftValue), 0);
1073      
1074      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + halfRightValue), 0);
1075      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - halfRightValue), 0);
1076    }
1077    else {
1078      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + halfLeftValue), 0);
1079      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - halfLeftValue), 0);
1080
1081      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle + halfRightValue)), 0);
1082      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle - halfRightValue)), 0);
1083    }
1084  }
1085}
1086
1087void drawPeaks() {  
1088  if (leftPeak > 0) {
1089    if (droppingPeakFade && leftPeakBouncing == false)
1090      stripHoldColor = left_strip.Color(max(1, (255 * leftPeak * ledFactor_div_numOfSegments)), 0, 0);
1091    else
1092      stripHoldColor = stripColor[numOfSegments];
1093
1094    if (splitStrip)
1095      left_strip.setPixelColor(getSpinCircleValue(leftPeak + leftPeakBounce), stripHoldColor);
1096    else
1097      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + (leftPeak + leftPeakBounce)), stripHoldColor);
1098  } 
1099  
1100  if (rightPeak > 0) {
1101    if (droppingPeakFade && rightPeakBouncing == false)
1102      stripHoldColor = left_strip.Color(max(1, (255 * rightPeak * ledFactor_div_numOfSegments)), 0, 0);    
1103    else
1104      stripHoldColor = stripColor[numOfSegments];
1105
1106    if (splitStrip) {
1107      if (stripsOn2Pins) {
1108        right_strip.setPixelColor(getSpinCircleValue(rightPeak + rightPeakBounce), stripHoldColor);
1109      }
1110      else {
1111        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + rightPeak + rightPeakBounce), stripHoldColor);
1112      }
1113    }
1114    else {
1115      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (rightPeak + rightPeakBounce)), stripHoldColor);
1116    }
1117  }
1118
1119  //if (leftPeak > 0 || rightPeak > 0)
1120  //  left_strip.show();    
1121}
1122
1123void clearLeftPeak() {  
1124  if (splitStrip)
1125    left_strip.setPixelColor(getSpinCircleValue(leftPeak + prevLeftPeakBounce), 0);
1126  else
1127    left_strip.setPixelColor(getSpinCircleValue(stripMiddle + (leftPeak + prevLeftPeakBounce)), 0);
1128
1129  if (droppingPeak)
1130    leftPeak = leftPeak * peakDropFactor;
1131  else
1132    leftPeak = 0;
1133  leftPeakTime = 0;
1134}
1135
1136void clearRightPeak() {
1137  if (splitStrip) {
1138    if( stripsOn2Pins) {
1139      right_strip.setPixelColor(getSpinCircleValue(rightPeak + prevRightPeakBounce), 0);
1140    }
1141    else {
1142      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + rightPeak + prevRightPeakBounce), 0);
1143    }
1144  }
1145  else {
1146    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (rightPeak + prevRightPeakBounce)), 0);
1147  }
1148  
1149  if (droppingPeak) 
1150    rightPeak = rightPeak * peakDropFactor;
1151  else
1152    rightPeak = 0;
1153  rightPeakTime = 0;
1154}
1155
1156void clearLeftBouncePeak() {
1157  if (splitStrip)
1158    left_strip.setPixelColor(getSpinCircleValue(leftPeak + prevLeftPeakBounce), 0);
1159  else
1160    left_strip.setPixelColor(getSpinCircleValue(stripMiddle + (leftPeak + prevLeftPeakBounce)), 0);
1161}
1162
1163void clearRightBouncePeak() {
1164  if (splitStrip) {
1165    if (stripsOn2Pins) {
1166      right_strip.setPixelColor(getSpinCircleValue(rightPeak + prevRightPeakBounce), 0);
1167    }
1168    else {
1169      left_strip.setPixelColor(getSpinCircleValue((stripMiddle + rightPeak + prevRightPeakBounce)), 0);
1170    }
1171  }
1172  else {
1173    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (rightPeak + prevRightPeakBounce)), 0);
1174  }
1175}
1176
1177void clearLeftBounce() {
1178  leftPeakBouncing = false;
1179  leftPeakBounceCounter = 0;
1180  leftPeakBounce = 0;
1181  prevLeftPeakBounce = 0;
1182  leftBouncingPeaksNumOfLeds = 0;
1183}
1184
1185void clearRightBounce() {
1186  rightPeakBouncing = false;
1187  rightPeakBounceCounter = 0;
1188  rightPeakBounce = 0;
1189  prevRightPeakBounce = 0;
1190  leftBouncingPeaksNumOfLeds = 0;
1191}
1192
1193void clearValues() {
1194  leftAnalogValue = 0;
1195  rightAnalogValue = 0;
1196  prevLeftAnalogValue = 0;
1197  prevRightAnalogValue = 0;
1198  leftPeak = 0;
1199  rightPeak = 0;
1200}
1201
1202
1203void drawOverflow() {
1204  for (i = 0; i <= numOfSegments; i++) {
1205    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - i), stripOverflowColor);
1206    if (stripsOn2Pins) {
1207      right_strip.setPixelColor(i, stripOverflowColor);
1208    }
1209    else {
1210      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), stripOverflowColor);
1211    }
1212  }
1213  left_strip.show();
1214  if (stripsOn2Pins)
1215    right_strip.show();
1216  
1217  delay(overflowDelay);
1218
1219  for (i = 0; i <= numOfSegments; i++) {
1220    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - i), 0);
1221    if (stripsOn2Pins) {
1222      right_strip.setPixelColor(i, 0);
1223    }
1224    else {
1225      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), 0);
1226    }
1227  }
1228  left_strip.show();
1229  if (stripsOn2Pins)
1230    right_strip.show();
1231}
1232
1233void setStripColors() {
1234  int r, g, b;
1235  int p1, p2;
1236
1237  ledFactor = (float) ledBrightness / 255;
1238  ledFactor_div_numOfSegments = (float) ledFactor / (float) numOfSegments;
1239  stripMiddleColor = left_strip.Color(0, 0, 255 * ledFactor);
1240  
1241  switch (colorScheme) {
1242    case 0: {      
1243      int orangeLimit;
1244      float orangeFactor = orangeLimitAmount / halfNumOfSegments;
1245    
1246      for (i = 0; i <= numOfSegments; i++) {
1247        if (i <= halfNumOfSegments)
1248          orangeLimit = (i * orangeFactor);
1249        else
1250          orangeLimit = ((numOfSegments - i) * orangeFactor);
1251    
1252        stripColor[i] = left_strip.Color((255 * i * ledFactor_div_numOfSegments), ((255 - orangeLimit) * (numOfSegments - i) * ledFactor_div_numOfSegments), 0); 
1253      }
1254      break;
1255    }
1256
1257    case 1: {
1258      for (i = 0; i <= numOfSegments; i++) {
1259        stripColor[i] = left_strip.Color(0, (255 * i * ledFactor_div_numOfSegments), (255 * (numOfSegments - i) * ledFactor_div_numOfSegments)); 
1260      }
1261      break;
1262    }
1263
1264    case 2: {
1265      for (i = 0; i <= numOfSegments; i++) {
1266        stripColor[i] = left_strip.Color((255 * i * ledFactor_div_numOfSegments), 0, (255 * (numOfSegments - i) * ledFactor_div_numOfSegments)); 
1267      }
1268      break;
1269    }
1270
1271    case 3: {
1272      for (i = 0; i <= numOfSegments; i++) {
1273        stripColor[i] = left_strip.Color((255 * (numOfSegments - i) * ledFactor_div_numOfSegments), 0, (255 * i * ledFactor_div_numOfSegments)); 
1274      }
1275      break;
1276    }
1277
1278    case 4: {
1279      for (i = 0; i <= numOfSegments; i++) {
1280        stripColor[i] = left_strip.Color(0, (255 * (numOfSegments - i) * ledFactor_div_numOfSegments), (255 * i * ledFactor_div_numOfSegments)); 
1281      }
1282      break;
1283    }
1284
1285    case 5: {
1286      for (i = 0; i <= numOfSegments; i++) {
1287        stripColor[i] = left_strip.Color((255 * (numOfSegments - i) * ledFactor_div_numOfSegments), (255 * i * ledFactor_div_numOfSegments), 0); 
1288      }
1289      break;
1290    }
1291
1292    case 6: {
1293      for (i = 0; i <= numOfSegments; i++) {
1294        r = (255 * i * ledFactor_div_numOfSegments);
1295        g = (255 * min(i, numOfSegments - i) * ledFactor_div_numOfSegments);
1296        b = (200 * (numOfSegments - i) * ledFactor_div_numOfSegments); 
1297        stripColor[i] = left_strip.Color(r, g, b); 
1298      }
1299      break;
1300    }
1301
1302    case 7: {
1303      for (i = 0; i <= numOfSegments; i++) {
1304        b = (255 * i * ledFactor_div_numOfSegments);
1305        g = (255 * min(i, numOfSegments - i) * ledFactor_div_numOfSegments);
1306        r = (255 * (numOfSegments - i) * ledFactor_div_numOfSegments); 
1307        stripColor[i] = left_strip.Color(r, g, b); 
1308      }
1309      break;
1310    }
1311
1312    case 8: {
1313      for (i = 0; i <= numOfSegments; i++) {
1314        r = (255 * i * ledFactor_div_numOfSegments);
1315        b = (255 * min(i, numOfSegments - i) * ledFactor_div_numOfSegments);
1316        g = (255 * (numOfSegments - i) * ledFactor_div_numOfSegments); 
1317        stripColor[i] = left_strip.Color(r, g, b); 
1318      }
1319      break;
1320    }
1321
1322    case 9: {
1323      for (i = 0; i <= numOfSegments; i++) {
1324        b = (255 * i * ledFactor_div_numOfSegments);
1325        r = (255 * min(i, numOfSegments - i) * ledFactor_div_numOfSegments);
1326        g = (255 * (numOfSegments - i) * ledFactor_div_numOfSegments); 
1327        stripColor[i] = left_strip.Color(r, g, b); 
1328      }
1329      break;
1330    }
1331
1332    case 10: 
1333      colorScheme11SpinValue = 0;
1334      
1335    case 11:     
1336    
1337    case 12: {
1338      p1 = (85 * numOfSegments / 255);
1339      p2 = (170 * numOfSegments / 255);
1340      int wheel;
1341
1342      if (colorScheme == 12)
1343        colorSchemeFactor = colorScheme12Factor;        
1344      else
1345        colorSchemeFactor = 1;
1346            
1347      for (i = 0; i <= numOfSegments; i++) {  
1348        //wheel = int(float(i + colorScheme11SpinValue) / colorSchemeFactor) % numOfSegments;  // reverse wheel
1349        
1350        wheel = int(float(i - colorScheme11SpinValue) / colorSchemeFactor + numOfSegments) % numOfSegments;
1351
1352        if (wheel < p1) {          
1353          wheel = map(wheel, 0, p1, 0, 255);
1354          r = (wheel * ledFactor);
1355          g = ((255 - wheel) * ledFactor);
1356          b = 0;
1357        } 
1358        else if (wheel < p2) {
1359          wheel = map(wheel, p1, p2, 0, 255);
1360          r = ((255 - wheel) * ledFactor);
1361          g = 0;
1362          b = (wheel * ledFactor);
1363        } 
1364        else {
1365          wheel = map(wheel, p2, numOfSegments, 0, 255);
1366          r = 0;
1367          g = (wheel * ledFactor);
1368          b = ((255 - wheel) * ledFactor);
1369        }        
1370
1371        stripColor[i] = left_strip.Color(r, g, b); 
1372      }
1373      break;
1374    }
1375  }
1376
1377  if (colorScheme >= 10)
1378    stripHoldColor = left_strip.Color(255 * ledFactor, 0, 0); // set to red for the color wheels
1379  else
1380    stripHoldColor = stripColor[numOfSegments];
1381    
1382  stripOverflowColor = stripHoldColor;   // left_strip.Color(min(255, 255 * ledFactor * 1.5), 0, 0);
1383}
1384
1385void startupAnimation() {  
1386  for (j = 0; j < 2; j++) {
1387    for (i = 0; i <= numOfSegments; i++) {
1388      if (animType == 1)
1389        left_strip.setPixelColor(stripMiddle - (numOfSegments - i), stripColor[i]);
1390      else
1391        left_strip.setPixelColor(stripMiddle - i, stripColor[i]);
1392      
1393      if (stripsOn2Pins)
1394        right_strip.setPixelColor(i, stripColor[i]);
1395      else
1396        left_strip.setPixelColor(stripMiddle + i, stripColor[i]);
1397
1398      left_strip.show();
1399      if (stripsOn2Pins)
1400        right_strip.show();  
1401      
1402      delay(startupAnimationDelay);
1403    }
1404    
1405    for (i = 0; i <= numOfSegments; i++) {
1406      if (animType == 1)
1407        left_strip.setPixelColor(stripMiddle - (numOfSegments - i), 0);
1408      else
1409        left_strip.setPixelColor(stripMiddle - i, 0);
1410        
1411      if (stripsOn2Pins)
1412        right_strip.setPixelColor(i, 0);
1413      else
1414        left_strip.setPixelColor(stripMiddle + i, 0);
1415
1416      left_strip.show();
1417      if (stripsOn2Pins)
1418        right_strip.show();  
1419      
1420      delay(startupAnimationDelay);
1421    }
1422  }
1423}
1424
1425void displayNumber (int number, int displayDelay) {
1426  left_strip.clear();
1427  if (stripsOn2Pins)
1428    right_strip.clear();
1429
1430  number++; // @EB_DEBUG : display value 0 at led 1
1431  
1432  for (i = 0; i <= number; i++) {
1433    if (i % 5 == 0) 
1434      colorValue = stripMiddleColor;
1435    else
1436      colorValue = stripColor[0];
1437
1438    left_strip.setPixelColor(middleOffset + i, colorValue);
1439
1440    if (stripsOn2Pins)
1441      right_strip.setPixelColor(middleOffset + i, colorValue);
1442    else
1443      left_strip.setPixelColor(stripMiddle + middleOffset + i, colorValue);
1444
1445    delay(45 - number * 3); // @EB_DEBUG
1446    
1447    left_strip.show();
1448    if (stripsOn2Pins)
1449      right_strip.show();  
1450  }
1451
1452  if (pulsing) {
1453    left_strip.setPixelColor(middleOffset + maxDisplaySegments, stripMiddleColor);
1454
1455    if (stripsOn2Pins)
1456      right_strip.setPixelColor(maxDisplaySegments, stripMiddleColor);
1457    else
1458      left_strip.setPixelColor(stripMiddle + maxDisplaySegments, stripMiddleColor);
1459
1460    left_strip.show();
1461    if (stripsOn2Pins)
1462      right_strip.show();  
1463  }
1464
1465  delay(displayDelay);
1466
1467  left_strip.clear();
1468  if (stripsOn2Pins)
1469    right_strip.clear();
1470}
1471
1472
1473//
1474// for debugging
1475//
1476
1477#ifdef DEBUG_TEST_LEDS
1478  void displayTest() {
1479    for (i = 0; i <= numOfSegments; i++) {
1480      left_strip.setPixelColor(stripMiddle - i, stripColor[i]);
1481
1482      if (stripsOn2Pins)
1483        right_strip.setPixelColor(i, stripColor[i]);
1484      else
1485        left_strip.setPixelColor(stripMiddle + i, stripColor[i]);
1486
1487      left_strip.show();
1488      if (stripsOn2Pins)
1489        right_strip.show();  
1490
1491      delay(50);
1492    }
1493    delay(5000);
1494  
1495    for (i = 0; i <= numOfSegments; i++) {
1496      left_strip.setPixelColor(stripMiddle - i, 0);
1497
1498      if (stripsOn2Pins)
1499        right_strip.setPixelColor(i, 0);
1500      else
1501        left_strip.setPixelColor(stripMiddle + i, 0);
1502
1503      left_strip.show();
1504      if (stripsOn2Pins)
1505        right_strip.show();  
1506    }
1507  }
1508  
1509  void serialDisplayRGB(int r, int g, int b) {
1510    Serial.print(i);
1511    Serial.print(" ");
1512    Serial.print(r);
1513    Serial.print(" ");
1514    Serial.print(g);
1515    Serial.print(" ");
1516    Serial.println(b);
1517  }
1518#endif

/*
**********************************************************************
* Stereo VU Meter for 1 or 2 LED rings or strips build by ericBcreator
* Designed to be used with an Arduino UNO, Nano or compatible device.
**********************************************************************
* Notice: search for @EB in the Sketch for important variables to set
* for the Sketch to work with your setup.
**********************************************************************
* Last updated 20180202 by ericBcreator
*
* This code is free for personal use, not for commercial purposes.
* Please leave this header intact.
*
* contact: ericBcreator@gmail.com
**********************************************************************
*/
#include <Adafruit_NeoPixel.h>
#define nonLinearLogAudio 

//#define led_strip_60                                    //uncomment this if you are using a single 60 LED strip (Center to sides mode)
#define led_2_strip_60                                  //uncomment this if you are using two 60 LED strips (Left-Right bottom to top mode)

//#define led_strip_30                                    //uncomment this if you are using a single 30 LED strip
//#define led_2_strip_30                                  //uncomment this if you are using two 30 LED strips

//#define led_strip_144                                   //uncomment this if you are using a single 144 LED strip
//#define led_2_strip_144                                 //uncomment this if you are using two 144 LED strips

const int useSensorValues = true;                         // @EB


//
// setup pins
//

int leftPin = A0, rightPin = A1;                          // left audio in on analog 0, right on analog 1
int brightnessPin = A4, sensitivityPin = A5;              // potentiometers for brightness and sensitivity on analog 4 and 5
int leftStripPin = 5;                                     // DIN of left led strip on digital pin 5
int rightStripPin = 6;                                    // DIN of right led strip on digital pin 6
int showPeaksPin = 7;                                     // switch to toggle peaks on or off on digital pin 7 (7, 9 for box version)
int showPeaksMomentarySwitch = false;                     // set false for an on/off toggle switch
int reverseShowPeaks = true;                              // reverses the on/off setting in case you made a wiring mistake ;-) @EB
int selectButton1Pin = 8;                                 // push button for changing settings on digital pin 8
int useSelectButton1 = true;                              // set to false if no push button1 for selecting the color scheme is connected  @EB
int selectButton2Pin = 9;                                 // push button for changing settings on digital pin 9
int useSelectButton2 = true;                              // set to false if no push button2 is connected  @EB


#if defined (led_strip_60)
  //settings for a 60 led strip

  int stripNumOfLeds = 60;                                  // the total number of leds
  int stripsOn2Pins = false;                                // set to true if the LED strips or rings are connected to 2 input pins
  uint32_t stripColor[31];                                  // half of the number of leds + 1
  int displayMiddleLed = true;                              // display the middle led (blue). set to true for one strip, false for two strips or rings
  int splitStrip = false;                                   // set to true when using 2 strips or rings, false for one strip
  int middleOffset = 1;                                     // offset for the middle led when using one strip
  int startupAnimationDelay = 6;                            // delay for the startup animation
  int orangeLimitAmount = 0;                                // limit the amount of green of the middle LEDs to make them more orange
  int swapLeftRight = false;                                // swap the left and right input values or not
  
  int dropDelay = 5;                                        // hold time before dropping the leds
  float dropFactor = .94;                                   // value for dropping the leds
  
  int peakTimeNoDropDelay = 250;                            // peak hold time when not dropping the peaks (when droppingPeak is false)
  int peakTimeFirstDropDelay = 70;                          // peak hold time when dropping the first peak
  int peakTimeDropDelay = 7;                                // peak hold time when dropping the rest of the peaks
  float peakDropFactor = .94;                               // value for dropping the peaks
  int droppingPeakFade = false;                             // display the dropping peak fading to black or not
  
  int bouncingPeaksNumOfLeds = 6;                           // how many leds to bounce up (max)
  int bouncingPeaksNumOfLedsMin = 3;                        // how many leds to bounce up (min) when using dynamicBouncingPeaks
  int bouncingPeakDelay = 4;                                // delay between peak bounce updates
  int bouncingPeakCounterInc = 10;                          // increase counter for each bounce update. note: it uses a 0-180 sin function for the bouncing

#elif defined (led_2_strip_60)
  //settings for 2 60 led strips

  int stripNumOfLeds = 60;
  int stripsOn2Pins = true;
  uint32_t stripColor[61];
  int displayMiddleLed = false;
  int splitStrip = true;
  int middleOffset = 0;
  int startupAnimationDelay = 1;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int dropDelay = 5;
  float dropFactor = .94;
  
  int peakTimeNoDropDelay = 250;
  int peakTimeFirstDropDelay = 70;
  int peakTimeDropDelay = 7;
  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int bouncingPeaksNumOfLeds = 12;
  int bouncingPeaksNumOfLedsMin = 4;
  int bouncingPeakDelay = 4;
  int bouncingPeakCounterInc = 10;
  
#elif defined (led_strip_30)
  //settings for a 30 led strip

  int stripNumOfLeds = 30;                                  // the total number of leds
  int stripsOn2Pins = false;                                // set to true if the LED strips or rings are connected to 2 input pins
  uint32_t stripColor[16];                                  // half of the number of leds + 1
  int displayMiddleLed = true;                              // display the middle led (blue). set to true for one strip, false for two strips or rings
  int splitStrip = false;                                   // set to true when using 2 strips or rings, false for one strip
  int middleOffset = 1;                                     // offset for the middle led when using one strip
  int startupAnimationDelay = 10;                           // delay for the startup animation
  int orangeLimitAmount = 0;                                // limit the amount of green of the middle LEDs to make them more orange
  int swapLeftRight = false;                                // swap the left and right input values or not
  
  int dropDelay = 10;                                       // hold time before dropping the leds
  float dropFactor = .9;                                    // value for dropping the leds
  
  int peakTimeNoDropDelay = 250;                            // peak hold time when not dropping the peaks (set droppingPeak true or false)
  int peakTimeFirstDropDelay = 150;                         // peak hold time when dropping the first peak
  int peakTimeDropDelay = 15;                               // peak hold time when dropping the rest of the peaks
  float peakDropFactor = .94;                               // value for dropping the peaks
  int droppingPeakFade = false;                             // display the dropping peak fading to black or not
  
  int bouncingPeaksNumOfLeds = 4;                           // how many leds to bounce up (max)
  int bouncingPeaksNumOfLedsMin = 2;                        // how many leds to bounce up (min) when using dynamicBouncingPeaks
  int bouncingPeakDelay = 4;                                // delay between peak bounce updates
  int bouncingPeakCounterInc = 9;                           // increase counter for each bounce update. note: it uses a 0-180 sin function for the bouncing

#elif defined (led_2_strip_30)
  //settings for 2 30 led strips

  int stripNumOfLeds = 30;
  int stripsOn2Pins = true;
  uint32_t stripColor[31];
  int displayMiddleLed = false;
  int splitStrip = true;
  int middleOffset = 0;
  int startupAnimationDelay = 1;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int dropDelay = 5;
  float dropFactor = .94;
  
  int peakTimeNoDropDelay = 250;
  int peakTimeFirstDropDelay = 70;
  int peakTimeDropDelay = 7;
  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int bouncingPeaksNumOfLeds = 12;
  int bouncingPeaksNumOfLedsMin = 4;
  int bouncingPeakDelay = 4;
  int bouncingPeakCounterInc = 10;
  
#elif defined (led_strip_144)
  //settings for a 144 led strip

  int stripNumOfLeds = 145;
  int stripsOn2Pins = false;
  uint32_t stripColor[73];
  int displayMiddleLed = true;
  int splitStrip = false;
  int middleOffset = 1;
  int startupAnimationDelay = 1;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int dropDelay = 4;
  float dropFactor = .92;
  
  int peakTimeNoDropDelay = 250;
  int peakTimeFirstDropDelay = 100;
  int peakTimeDropDelay = 5;
  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int bouncingPeaksNumOfLeds = 10;
  int bouncingPeaksNumOfLedsMin = 4;
  int bouncingPeakDelay = 2;
  int bouncingPeakCounterInc = 10;

#elif defined (led_2_strip_144)
  //settings for 2 144 led strips

  int stripNumOfLeds = 144;
  int stripsOn2Pins = true;
  uint32_t stripColor[145];
  int displayMiddleLed = false;
  int splitStrip = true;
  int middleOffset = 0;
  int startupAnimationDelay = 1;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int dropDelay = 5;
  float dropFactor = .94;
  
  int peakTimeNoDropDelay = 250;
  int peakTimeFirstDropDelay = 70;
  int peakTimeDropDelay = 7;
  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int bouncingPeaksNumOfLeds = 12;
  int bouncingPeaksNumOfLedsMin = 4;
  int bouncingPeakDelay = 4;
  int bouncingPeakCounterInc = 10;
  
#endif
//
// setup other user variables
//

// basic settings
int pulsing = false;                                       // pulsing will display from the middle of each strip or ring  @EB

int spinCircle = false;                                    // spin the animation. will not work with stripsOn2Pins  @EB

int animType = 0;                                         // startup animation selection (1 looks nice for 1 ring)  @EB
int colorScheme = 10;                                     // 0: green-red, 1: blue-green, 2: blue-red, 3: red-blue, 4: green-blue, 5: red-green, 6: blue-white-red
                                                          // 7: red-white-blue, 8: green-white-red, 9: green-white-blue, 10: color wheel, 11: spinning color wheel,
                                            // 12: as 11 but spread with factor colorScheme12Factor  @EB
int maxColorScheme = 12;                                  // used for looping through the color schemes with the switch button
int colorScheme11SpinDelay = stripNumOfLeds / 4 ;         // delay for spinning scheme 11
int colorScheme12Factor = 3;                              // wheel spread factor for scheme 12 @EB

int minValue = 10;                                        // min analog input value
int sensitivityValue = 110;                               // 0 - 255, initial value (value read from the potentiometer if useSensorValues = true)

#ifdef highLevelInput
  int maxValue = 700;                                     // max analog input value (0-1023 equals 0-5V). try 300 for low level input, 700 for high
  int maxSensitivity = 2 * 255;                           // set to a higher setting to amplify low input levels. try 4 * 255 for low level input, 2 * 255 for high
#else
  int maxValue = 300;                                     // max analog input value (0-1023 equals 0-5V). try 300 for low level input, 700 for high
  int maxSensitivity = 4 * 255;                           // set to a higher setting to amplify low input levels. try 4 * 255 for low level input, 2 * 255 for high
#endif

int ledBrightness = 30;                                   // 0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
int sensorDeviationBrightness = 3;                        // eliminate fluctuating values
int overflowDelay = 10;                                   // overflow hold time

// peak settings @EB
int displayPeaks = false;                                 // value will be set by the switch if useSensorValues = true
int displayTopAsPeak = true;                              // always display the top LED in peak color
int droppingPeak = true;                                  // display dropping peaks or not. note: displayPeaks has to be true 
int bouncingPeaks = false;                                // display bouncing peaks or not. note: displayPeaks has to be true 
int dynamicBouncingPeaks = false;                         // bounce less with lower peaks. note: bouncingPeaks has to be true 

//
// initialize other variables 
//

int numOfSegments, halfNumOfSegments, stripMiddle, maxDisplaySegments;
float sensitivityFactor;
float nonLinearResponseFactor;

int brightnessValue, prevBrightnessValue;
float ledFactor, ledFactor_div_numOfSegments;

uint32_t stripMiddleColor, stripOverflowColor, stripHoldColor;
uint32_t colorValue;

int leftValue = 0, rightValue = 0, maxReadValue = 0;
int leftValueN = 0, rightValueN = 0;
int leftAnalogValue = 0, rightAnalogValue = 0;
float log10MaxDisplaySegments;

int prevLeftValue = 0, prevRightValue = 0;
int prevLeftAnalogValue = 0, prevRightAnalogValue = 0;

int selectButton1PinState = 0, prevSelectButton1PinState = 0;
int selectButton2PinState = 0, prevSelectButton2PinState = 0;

int selectButton1PinSetting = colorScheme;
int selectButton2PinSetting = 0;

int i, j;
int dropLeft, dropRight;
int leftDropTime, rightDropTime;

int leftPeak = 0, rightPeak = 0;
int leftPeakTime = 0, rightPeakTime = 0;
int leftFirstPeak = true, rightFirstPeak = true;
int showPeaksPinSetting, prevShowPeaksPinSetting;

int stripPulseMiddle = 0;
int halfLeftValue, halfRightValue, halfPrevLeftValue, halfPrevRightValue;

int leftPeakBouncing = false, rightPeakBouncing = false;
int leftPeakBounce = 0, rightPeakBounce = 0;
int prevLeftPeakBounce = 0, prevRightPeakBounce = 0;
int leftPeakBounceCounter = 0, rightPeakBounceCounter = 0;
int leftPeakBounceDelayCounter = 0, rightPeakBounceDelayCounter = 0;
int leftBouncingPeaksNumOfLeds = 0, rightBouncingPeaksNumOfLeds = 0;
float bounceFactor;

int colorScheme11SpinValue = 0, colorScheme11SpinDelayValue = 0;
int colorSchemeFactor = 1;
long selectButton1Timer;

int spinDelayCounter = 0, spinCounter = 0, spinTurnsCounter = 0, spinTurnsMax = 0, spinTurnsDelay = 0, spinTurnsDelayMax = 0;
int spinCounterInc = 1;
int spinDelay = 0;
//
// initialize the strip or rings
//

Adafruit_NeoPixel left_strip = Adafruit_NeoPixel(stripNumOfLeds, leftStripPin, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel right_strip = Adafruit_NeoPixel(stripNumOfLeds, rightStripPin, NEO_GRB + NEO_KHZ800);

//
// setup
//

void setup() {
  #ifdef DEBUG
    Serial.begin(9600);
  #endif

  randomSeed(analogRead(2));

  if (stripsOn2Pins) {
    numOfSegments = stripNumOfLeds;
    maxDisplaySegments = numOfSegments - 1;
    
    stripMiddle = stripNumOfLeds;
    stripPulseMiddle = stripMiddle / 2;
    spinCircle = false;
  }
  else {
    numOfSegments = stripNumOfLeds / 2;
    stripMiddle = stripNumOfLeds / 2;
    maxDisplaySegments = stripMiddle - 1;

    stripPulseMiddle = stripMiddle / 2;
  }

  halfNumOfSegments = numOfSegments / 2; 
  bounceFactor = (float) bouncingPeaksNumOfLeds / (maxDisplaySegments - bouncingPeaksNumOfLeds);
  nonLinearResponseFactor = 90 / (float) maxDisplaySegments;
  log10MaxDisplaySegments = log10(maxDisplaySegments);

  pinMode(showPeaksPin, INPUT);    
  
  if (useSelectButton1)
    pinMode(selectButton1Pin, INPUT);  

  left_strip.begin();
  if (stripsOn2Pins) 
    right_strip.begin();

  if (useSensorValues) {
    readSensorValues();
    setInitialDisplayPeaks();
  }
  else {
    setStripColors();
    setSensitivityFactor();
  }

  #ifdef DEBUG_TEST_LEDS
    displayTest();
  #endif

  startupAnimation();
}

//
// main loop
//

void loop() {
  #ifdef DEBUG_PRINT_LOOP_TIME
    long time = millis();
  #endif


  if (useSensorValues) 
    readSensorValues();
  
  readValues();

  #if defined (DEBUG_NO_PEAKS)
    displayPeaks = false;
  #endif

  #if defined (DEBUG_PEAKS)
    displayPeaks = true;
  #endif

  if (pulsing) {
    drawPulsingValues();
  }
  else {
    drawValues();
    if (displayPeaks) {
      getPeaks();
      drawPeaks();
    }
  }

  left_strip.show();
  if (stripsOn2Pins)
    right_strip.show();
    
  storePrevValues();

  checkSpinCircle();

  #ifdef DEBUG_PRINT_LOOP_TIME
    time = millis() - time;
    Serial.println(time);
  #endif
}

// 
// functions
//

void setInitialDisplayPeaks() {
  #if !defined (DEBUG_NO_PEAK_SWITCH)
    showPeaksPinSetting = digitalRead(showPeaksPin);
  
    if (showPeaksPinSetting == HIGH)
      displayPeaks = false;
  #endif 
 
  if (reverseShowPeaks) {
    if (!displayPeaks)
      displayPeaks = true;
    else
      displayPeaks = false;
  }
  
  prevShowPeaksPinSetting = showPeaksPinSetting;
}

void readSensorValues() {
  //
  // peaks pin
  //

  #if !defined (DEBUG_NO_PEAK_SWITCH)
    showPeaksPinSetting = digitalRead(showPeaksPin);
  
    if (showPeaksMomentarySwitch) {
      if (showPeaksPinSetting == LOW && prevShowPeaksPinSetting == HIGH) {
        if (displayPeaks == true) {
          displayPeaks = false;
          clearLeftPeak();
          clearRightPeak();        
          if (showPeaksMomentarySwitch)
            while (digitalRead(showPeaksPin) == LOW) {}
        }
        else {
          displayPeaks = true;
        }
      }
    } 
    else {
      if (reverseShowPeaks) {
        if (showPeaksPinSetting == HIGH && prevShowPeaksPinSetting == LOW) 
          displayPeaks = true;
        else if (showPeaksPinSetting == LOW && prevShowPeaksPinSetting == HIGH) {
          displayPeaks = false;
          clearLeftPeak();
          clearRightPeak();        
        }
      }
      else {    
        if (showPeaksPinSetting == LOW && prevShowPeaksPinSetting == HIGH) 
          displayPeaks = true;
        else if (showPeaksPinSetting == HIGH && prevShowPeaksPinSetting == LOW) {
          displayPeaks = false;
          clearLeftPeak();
          clearRightPeak();        
        }
      }
    }
    if (pulsing) {
      if (displayPeaks)
        displayTopAsPeak = true;
      else
        displayTopAsPeak = false;
    }

    prevShowPeaksPinSetting = showPeaksPinSetting;
  #endif
  

  //
  // selectButtonPin 1 and 2
  //
  if (useSelectButton1) {      
    selectButton1PinState = digitalRead(selectButton1Pin);
    
    if (selectButton1PinState == HIGH && prevSelectButton1PinState == LOW)
      selectButton1Timer = millis();
      
    if (selectButton1PinState == HIGH && prevSelectButton1PinState == HIGH) {
      if ((millis() - selectButton1Timer) > 1000) {
        pulsing = !pulsing;
        setStripColors();
        displayNumber(colorScheme, 250);

        while (digitalRead(selectButton1Pin) == HIGH) {}
        selectButton1PinState = LOW;
        clearValues();
      }
    }
    else if (selectButton1PinState == LOW && prevSelectButton1PinState == HIGH) {
      selectButton1PinSetting++;
      if (selectButton1PinSetting > maxColorScheme) {
        selectButton1PinSetting = 0;
      }
      colorScheme = selectButton1PinSetting;

      if (colorScheme == 12)
        colorScheme11SpinValue = (colorScheme11SpinValue * colorScheme12Factor);

      setStripColors();
      displayNumber(colorScheme, 250);
    }
    prevSelectButton1PinState = selectButton1PinState;
  }

  if (useSelectButton2) {
    selectButton2PinState = digitalRead(selectButton2Pin);
    
    if (selectButton2PinState == HIGH && prevSelectButton2PinState == LOW) {
      selectButton2PinSetting++;
      
      switch(selectButton2PinSetting) {
        case 0:
        case 1: {   
          pulsing = true;
          spinCircle = false;
          break;
        }
        case 2: {
          pulsing = true;
          spinCircle = true;
          break;
        }
        case 3: {
          pulsing = false;
          spinCircle = false;
          selectButton2PinSetting = 0;
          break;
        }
      }
      
      setStripColors();
      displayNumber(colorScheme, 250);
    }
    
    prevSelectButton2PinState = selectButton2PinState;
  }
  
  //
  // brightness
  //
  brightnessValue = analogRead(brightnessPin);
  brightnessValue = map(brightnessValue, 0, 1023, 0, 255);
  
  if (abs(brightnessValue - prevBrightnessValue) > sensorDeviationBrightness) {
    ledBrightness = brightnessValue;
    setStripColors();
    prevBrightnessValue = brightnessValue;
  }

  //
  // colorscheme 11 spinning wheel
  //

  if (colorScheme == 11 || colorScheme == 12) {
    colorScheme11SpinDelayValue++;
    if (colorScheme11SpinDelayValue == colorScheme11SpinDelay) {
      colorScheme11SpinDelayValue = 0;
      colorScheme11SpinValue++;
      if (colorScheme11SpinValue > maxDisplaySegments * colorSchemeFactor)
        colorScheme11SpinValue = 0;
      setStripColors();
    }
  }

  //
  // sensitivity
  //
  sensitivityValue = analogRead(sensitivityPin);
  sensitivityValue = map(sensitivityValue, 0, 1023, 0, 255);
  setSensitivityFactor();
}

void setSensitivityFactor() {
  //sensitivityValue_div_numOfSegments = sensitivityValue / numOfSegments;
  sensitivityFactor = ((float) sensitivityValue / 255 * (float) maxSensitivity / 255);
}

void readValues() {
  #ifdef averageReadings
    leftAnalogValue = 0;
    rightAnalogValue = 0;
    
    for (i = 0; i <= averageNumOfReadings; i++) {
      leftAnalogValue += analogRead(leftPin);
      rightAnalogValue += analogRead(rightPin);
    }

    leftAnalogValue /= averageNumOfReadings;
    rightAnalogValue /= averageNumOfReadings;
    
  #else  
    leftAnalogValue = analogRead(leftPin);
    rightAnalogValue = analogRead(rightPin);
  #endif

  if (swapLeftRight) {
    int tempValue = leftAnalogValue;
    leftAnalogValue = rightAnalogValue;
    rightAnalogValue = tempValue;
  }

  if (leftAnalogValue < prevLeftAnalogValue) {
    leftDropTime++;
    if (leftDropTime > dropDelay) {
      leftAnalogValue = prevLeftAnalogValue * dropFactor;
      leftDropTime = 0;
    }
    else
      leftAnalogValue = prevLeftAnalogValue;
  }
   
  if (rightAnalogValue < prevRightAnalogValue) {
    rightDropTime++;
    if (rightDropTime > dropDelay) {
      rightAnalogValue = prevRightAnalogValue * dropFactor;
      rightDropTime = 0;
    }
    else
      rightAnalogValue = prevRightAnalogValue;
  }

  #ifdef DEBUG_PRINT_ANALOGVALUES
    Serial.print(leftAnalogValue);
    Serial.print(" ");
    Serial.println(rightAnalogValue);
  #endif  

  // map values  
  leftValue = map(leftAnalogValue * sensitivityFactor, minValue, maxValue, 0, maxDisplaySegments);
  rightValue = map(rightAnalogValue * sensitivityFactor, minValue, maxValue, 0, maxDisplaySegments);
  
  // if defined, convert to (reverse) non linear response
  boolean flagNonLinear = false;
  
  #if defined (nonLinearSinAudio)
    flagNonLinear = true;
    leftValueN = ((sin(((leftValue * nonLinearResponseFactor) + 270) * 0.0174533) + 1) * maxDisplaySegments);
    rightValueN = ((sin(((rightValue * nonLinearResponseFactor) + 270) * 0.0174533) + 1) * maxDisplaySegments);
    
  #elif defined (nonLinearReverseSinAudio)
    flagNonLinear = true;
    leftValueN = ((sin(((leftValue * nonLinearResponseFactor)) * 0.0174533)) * maxDisplaySegments);
    rightValueN = ((sin(((rightValue * nonLinearResponseFactor)) * 0.0174533)) * maxDisplaySegments);

  #elif defined (nonLinearLogAudio)
    flagNonLinear = true;
    leftValueN = ((log10(leftValue  + 1) / log10MaxDisplaySegments * maxDisplaySegments));
    rightValueN = ((log10(rightValue  + 1) / log10MaxDisplaySegments * maxDisplaySegments));
  
  #endif
  
  if (flagNonLinear == true) {
    #if defined (nonLinearAvr2)
      leftValue = (leftValue + leftValueN) / 2;
      rightValue = (rightValue + rightValueN) / 2;
    #else
      leftValue = leftValueN;
      rightValue = rightValueN;
    #endif
  }
  
// @EB_DEBUG

  #ifdef displayOverflow
    #ifdef compressOverflowPeaks
      for (i = 1; i <= compressOverflowNumOfTimes; i++) {
        if (leftValue > maxDisplaySegments) {
//          Serial.print(i);    
//          Serial.print("  ");
//          Serial.print(leftValue);    
//          Serial.print("  ");
          leftValue = leftValue - leftValue * compressOverflowFactor * i;
//          Serial.print(leftValue);
//          Serial.print("  ");
//          Serial.println(maxDisplaySegments);
        }
      }
    #endif
  #endif
  
  if (leftValue > maxDisplaySegments) {      
    leftValue = maxDisplaySegments;
    #ifdef displayOverflow
      drawOverflow();
    #endif
  }

  #ifdef displayOverflow
    #ifdef compressOverflowPeaks
      if (rightValue > maxDisplaySegments)
        rightValue = rightValue - rightValue * compressOverflowFactor;
    #endif
  #endif
  
  if (rightValue > maxDisplaySegments) {
    rightValue = maxDisplaySegments;
    #ifdef displayOverflow
      drawOverflow();
    #endif
  }
}

void storePrevValues() {
  prevLeftAnalogValue = leftAnalogValue;
  prevRightAnalogValue = rightAnalogValue;

  prevLeftValue = leftValue;
  prevRightValue = rightValue;
}

void getPeaks() {
  if (leftValue > leftPeak) {
    if (dynamicBouncingPeaks || prevLeftPeakBounce > 0)
      clearLeftBouncePeak();
          
    leftPeak = leftValue;
    leftPeakTime = 0;
    leftFirstPeak = true;

    if (bouncingPeaks) {
      leftPeakBouncing = true;
      leftPeakBounceCounter = 0;
      leftPeakBounceDelayCounter = 0;
      
      if (dynamicBouncingPeaks)
        leftBouncingPeaksNumOfLeds = max(bouncingPeaksNumOfLedsMin, (leftPeak * bounceFactor));
      else
        leftBouncingPeaksNumOfLeds = bouncingPeaksNumOfLeds;
    }
  }
  else {
    leftPeakTime++;
    if (droppingPeak) {
      if (leftFirstPeak) {
        if (leftPeakTime > peakTimeFirstDropDelay) {
          clearLeftPeak();
          leftFirstPeak = false;
        }
      }
      else {
        if (leftPeakTime > peakTimeDropDelay) {
          clearLeftPeak();
        }
      }
    }
    else {
      if (leftPeakTime > peakTimeNoDropDelay) {
        clearLeftPeak();
      }
    }
  }

  if (leftPeakBouncing) {
    if (leftFirstPeak) {
      leftPeakBounceDelayCounter++;
      if (leftPeakBounceDelayCounter >= bouncingPeakDelay) {
        leftPeakBounceDelayCounter = 0;
        leftPeakBounceCounter += bouncingPeakCounterInc;
        if (leftPeakBounceCounter >= 180) {
          clearLeftBouncePeak();
          clearLeftBounce();
        }
        else {        
          leftPeakBounce = min((sin(leftPeakBounceCounter * 0.0174533) * leftBouncingPeaksNumOfLeds), (maxDisplaySegments - leftPeak));
          if (leftPeakBounce != prevLeftPeakBounce) {
            clearLeftBouncePeak();
          }
          prevLeftPeakBounce = leftPeakBounce;
        }
      }
    }
  }

  if (rightValue > rightPeak) {
    if (dynamicBouncingPeaks || prevRightPeakBounce > 0)
      clearRightBouncePeak();

    rightPeak = rightValue;
    rightPeakTime = 0;
    rightFirstPeak = true;

    if (bouncingPeaks) {
      rightPeakBouncing = true;
      rightPeakBounceCounter = 0;
      rightPeakBounceDelayCounter = 0;

      if (dynamicBouncingPeaks)
        rightBouncingPeaksNumOfLeds = max(bouncingPeaksNumOfLedsMin, (rightPeak * bounceFactor));
      else
        rightBouncingPeaksNumOfLeds = bouncingPeaksNumOfLeds;
    }
  }
  else {
    rightPeakTime++;
    if (droppingPeak) {
      if (rightFirstPeak) {
        if (rightPeakTime > peakTimeFirstDropDelay) {
          clearRightPeak();
          rightFirstPeak = false;
        }
      }
      else {
        if (rightPeakTime > peakTimeDropDelay)
          clearRightPeak();
      }
    }
    else {
      if (rightPeakTime > peakTimeNoDropDelay)
        clearRightPeak();
    }
  }

  if (rightPeakBouncing) {
    if (rightFirstPeak) {
      rightPeakBounceDelayCounter++;
      if (rightPeakBounceDelayCounter >= bouncingPeakDelay) {
        rightPeakBounceDelayCounter = 0;
        rightPeakBounceCounter += bouncingPeakCounterInc;
  
        if (rightPeakBounceCounter >= 180) {
          clearRightBouncePeak();
          clearRightBounce();
        }
        else {        
          rightPeakBounce = min((sin(rightPeakBounceCounter * 0.0174533) * rightBouncingPeaksNumOfLeds), (maxDisplaySegments - rightPeak));
          if (rightPeakBounce != prevRightPeakBounce) {
            clearRightBouncePeak();
          }
          prevRightPeakBounce = rightPeakBounce;
        }
      }
    }
  }
}

void checkSpinCircle () {
  if (spinCircle) {
    if (spinTurnsMax == 0) {
      spinTurnsMax = random(stripNumOfLeds / 4, stripNumOfLeds * 3);  // spin at least a quarter turn, max 3 turns
      
      if (random(10) > 4)
        spinCounterInc = -spinCounterInc;
      
      spinTurnsDelayMax = random(100, 1000); // @EB_DEBUG

      spinDelay = random(20, 75); // @EB_DEBUG
    }

    if (spinTurnsCounter == spinTurnsMax) {
      spinTurnsDelay++;
      if (spinTurnsDelay == spinTurnsDelayMax) {
        spinTurnsDelay = 0;
        spinTurnsCounter = 0;
        spinTurnsMax = 0;
      }
    }
    else {
      spinDelayCounter++;
  
      if (spinDelayCounter > spinDelay) {
        clearZeroAndPeaks();

        spinCounter += spinCounterInc;
        if (spinCounter > stripNumOfLeds)
          spinCounter = 0;
        else if (spinCounter < 0)
          spinCounter = stripNumOfLeds;

        spinTurnsCounter++;
        spinDelayCounter = 0;
      }
    }
  }
}

int getSpinCircleValue(int value) {
  if (!spinCircle)
   return value;
  else {
    int calcValue = value + spinCounter;
    if (calcValue >= stripNumOfLeds)
      calcValue -= stripNumOfLeds;
    return calcValue;
  }
}

void drawValues() {
  if (splitStrip) {
    for (i = middleOffset; i < leftValue; i++)
      left_strip.setPixelColor(getSpinCircleValue(i), stripColor[i]);

    if (!displayPeaks && displayTopAsPeak)
      left_strip.setPixelColor(getSpinCircleValue(leftValue), stripHoldColor);

    for (i = prevLeftValue; i >= leftValue; i--)
      left_strip.setPixelColor(getSpinCircleValue(i), 0);

    if (stripsOn2Pins) {
      for (i = middleOffset; i < rightValue; i++) 
        right_strip.setPixelColor(i, stripColor[i]);

      if (!displayPeaks && displayTopAsPeak)
        right_strip.setPixelColor(rightValue, stripHoldColor);

      for (i = prevRightValue; i >= rightValue; i--)
        right_strip.setPixelColor(i, 0);
    }
    else {
      for (i = middleOffset; i < rightValue; i++)
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), stripColor[i]);

      if (!displayPeaks && displayTopAsPeak)
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + rightValue), stripHoldColor);
        
      for (i = prevRightValue; i >= rightValue; i--)
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), 0);
    }
  }
  else {
    for (i = middleOffset; i < leftValue; i++)
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), stripColor[i]);

    if (!displayPeaks && displayTopAsPeak)
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + leftValue), stripHoldColor);

    for (i = prevLeftValue; i >= leftValue; i--)
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), 0);
  
    for (i = middleOffset; i < rightValue; i++)
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - i), stripColor[i]);

    if (!displayPeaks && displayTopAsPeak)
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - rightValue), stripHoldColor);

    for (i = prevRightValue; i >= rightValue; i--)
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - i), 0);
  }

  if (displayMiddleLed) 
    left_strip.setPixelColor(getSpinCircleValue(stripMiddle), stripMiddleColor);
}

void drawPulsingValues() {
  halfLeftValue = (leftValue + 1) / 2;
  halfRightValue = (rightValue + 1) / 2;
  halfPrevLeftValue = (prevLeftValue + 1)/ 2;
  halfPrevRightValue = (prevRightValue + 1) / 2;
  
  if (splitStrip) {
    for (i = 0; i < halfLeftValue; i++) {
      colorValue = stripColor[i * 2];
      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + i), colorValue);
      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - i), colorValue);
    }

    if (displayTopAsPeak) {
      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + halfLeftValue), stripHoldColor);
      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - halfLeftValue), stripHoldColor);
    }

    for (i = halfPrevLeftValue; i >= halfLeftValue; i--) {
      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + i), 0);
      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - i), 0);
    }

    if (stripsOn2Pins) {
      for (i = 0; i < halfRightValue; i++) {
        colorValue = stripColor[i * 2];
        right_strip.setPixelColor((stripPulseMiddle + i), colorValue);
        right_strip.setPixelColor((stripPulseMiddle - i), colorValue);
      }

      if (displayTopAsPeak) {
        right_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + halfRightValue), stripHoldColor);
        right_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - halfRightValue), stripHoldColor);
      }
      
      for (i = halfPrevRightValue; i >= halfRightValue; i--) {
        right_strip.setPixelColor((stripPulseMiddle + i), 0);
        right_strip.setPixelColor((stripPulseMiddle - i), 0);
      }
    }
    else {
      for (i = 0; i < halfRightValue; i++) {
        colorValue = colorValue = stripColor[i * 2];
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + i), colorValue);
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - i), colorValue);
      }

      if (displayTopAsPeak) {
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + halfRightValue), stripHoldColor);
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - halfRightValue), stripHoldColor);
      }

      for (i = halfPrevRightValue; i >= halfRightValue; i--) {
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + i), 0);
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - i), 0);
      }
    }
  }
  else {
    for (i = 0; i < halfLeftValue; i++) {
      colorValue = colorValue = stripColor[i * 2];
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + i), colorValue);
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - i), colorValue);
    }

    if (displayTopAsPeak) {
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + halfLeftValue), stripHoldColor);
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - halfLeftValue), stripHoldColor);
    }
    
    for (i = halfPrevLeftValue; i >= halfLeftValue; i--) {
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + i), 0);
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - i), 0);
    }
  
    for (i = 0; i < halfRightValue; i++) {
      colorValue = colorValue = stripColor[i * 2];
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle + i)), colorValue);
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle - i)), colorValue);
    }

    if (displayTopAsPeak) {
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle + halfRightValue)), stripHoldColor);
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle - halfRightValue)), stripHoldColor);
    }
    
    for (i = halfPrevRightValue; i >= halfRightValue; i--) {
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle + i)), 0);
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle - i)), 0);
    }
  }

  if (displayMiddleLed) {
    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - stripPulseMiddle), stripMiddleColor);
    left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle), stripMiddleColor);
  }
}

void clearZeroAndPeaks() {
  left_strip.setPixelColor(getSpinCircleValue(middleOffset), 0);
  left_strip.setPixelColor(getSpinCircleValue(stripMiddle), 0);

  if (displayTopAsPeak) {
    if (splitStrip) {
      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle + halfLeftValue), 0);
      left_strip.setPixelColor(getSpinCircleValue(stripPulseMiddle - halfLeftValue), 0);
      
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + halfRightValue), 0);
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - halfRightValue), 0);
    }
    else {
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle + halfLeftValue), 0);
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + stripPulseMiddle - halfLeftValue), 0);

      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle + halfRightValue)), 0);
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (stripPulseMiddle - halfRightValue)), 0);
    }
  }
}

void drawPeaks() {  
  if (leftPeak > 0) {
    if (droppingPeakFade && leftPeakBouncing == false)
      stripHoldColor = left_strip.Color(max(1, (255 * leftPeak * ledFactor_div_numOfSegments)), 0, 0);
    else
      stripHoldColor = stripColor[numOfSegments];

    if (splitStrip)
      left_strip.setPixelColor(getSpinCircleValue(leftPeak + leftPeakBounce), stripHoldColor);
    else
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + (leftPeak + leftPeakBounce)), stripHoldColor);
  } 
  
  if (rightPeak > 0) {
    if (droppingPeakFade && rightPeakBouncing == false)
      stripHoldColor = left_strip.Color(max(1, (255 * rightPeak * ledFactor_div_numOfSegments)), 0, 0);    
    else
      stripHoldColor = stripColor[numOfSegments];

    if (splitStrip) {
      if (stripsOn2Pins) {
        right_strip.setPixelColor(getSpinCircleValue(rightPeak + rightPeakBounce), stripHoldColor);
      }
      else {
        left_strip.setPixelColor(getSpinCircleValue(stripMiddle + rightPeak + rightPeakBounce), stripHoldColor);
      }
    }
    else {
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (rightPeak + rightPeakBounce)), stripHoldColor);
    }
  }

  //if (leftPeak > 0 || rightPeak > 0)
  //  left_strip.show();    
}

void clearLeftPeak() {  
  if (splitStrip)
    left_strip.setPixelColor(getSpinCircleValue(leftPeak + prevLeftPeakBounce), 0);
  else
    left_strip.setPixelColor(getSpinCircleValue(stripMiddle + (leftPeak + prevLeftPeakBounce)), 0);

  if (droppingPeak)
    leftPeak = leftPeak * peakDropFactor;
  else
    leftPeak = 0;
  leftPeakTime = 0;
}

void clearRightPeak() {
  if (splitStrip) {
    if( stripsOn2Pins) {
      right_strip.setPixelColor(getSpinCircleValue(rightPeak + prevRightPeakBounce), 0);
    }
    else {
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + rightPeak + prevRightPeakBounce), 0);
    }
  }
  else {
    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (rightPeak + prevRightPeakBounce)), 0);
  }
  
  if (droppingPeak) 
    rightPeak = rightPeak * peakDropFactor;
  else
    rightPeak = 0;
  rightPeakTime = 0;
}

void clearLeftBouncePeak() {
  if (splitStrip)
    left_strip.setPixelColor(getSpinCircleValue(leftPeak + prevLeftPeakBounce), 0);
  else
    left_strip.setPixelColor(getSpinCircleValue(stripMiddle + (leftPeak + prevLeftPeakBounce)), 0);
}

void clearRightBouncePeak() {
  if (splitStrip) {
    if (stripsOn2Pins) {
      right_strip.setPixelColor(getSpinCircleValue(rightPeak + prevRightPeakBounce), 0);
    }
    else {
      left_strip.setPixelColor(getSpinCircleValue((stripMiddle + rightPeak + prevRightPeakBounce)), 0);
    }
  }
  else {
    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - (rightPeak + prevRightPeakBounce)), 0);
  }
}

void clearLeftBounce() {
  leftPeakBouncing = false;
  leftPeakBounceCounter = 0;
  leftPeakBounce = 0;
  prevLeftPeakBounce = 0;
  leftBouncingPeaksNumOfLeds = 0;
}

void clearRightBounce() {
  rightPeakBouncing = false;
  rightPeakBounceCounter = 0;
  rightPeakBounce = 0;
  prevRightPeakBounce = 0;
  leftBouncingPeaksNumOfLeds = 0;
}

void clearValues() {
  leftAnalogValue = 0;
  rightAnalogValue = 0;
  prevLeftAnalogValue = 0;
  prevRightAnalogValue = 0;
  leftPeak = 0;
  rightPeak = 0;
}


void drawOverflow() {
  for (i = 0; i <= numOfSegments; i++) {
    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - i), stripOverflowColor);
    if (stripsOn2Pins) {
      right_strip.setPixelColor(i, stripOverflowColor);
    }
    else {
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), stripOverflowColor);
    }
  }
  left_strip.show();
  if (stripsOn2Pins)
    right_strip.show();
  
  delay(overflowDelay);

  for (i = 0; i <= numOfSegments; i++) {
    left_strip.setPixelColor(getSpinCircleValue(stripMiddle - i), 0);
    if (stripsOn2Pins) {
      right_strip.setPixelColor(i, 0);
    }
    else {
      left_strip.setPixelColor(getSpinCircleValue(stripMiddle + i), 0);
    }
  }
  left_strip.show();
  if (stripsOn2Pins)
    right_strip.show();
}

void setStripColors() {
  int r, g, b;
  int p1, p2;

  ledFactor = (float) ledBrightness / 255;
  ledFactor_div_numOfSegments = (float) ledFactor / (float) numOfSegments;
  stripMiddleColor = left_strip.Color(0, 0, 255 * ledFactor);
  
  switch (colorScheme) {
    case 0: {      
      int orangeLimit;
      float orangeFactor = orangeLimitAmount / halfNumOfSegments;
    
      for (i = 0; i <= numOfSegments; i++) {
        if (i <= halfNumOfSegments)
          orangeLimit = (i * orangeFactor);
        else
          orangeLimit = ((numOfSegments - i) * orangeFactor);
    
        stripColor[i] = left_strip.Color((255 * i * ledFactor_div_numOfSegments), ((255 - orangeLimit) * (numOfSegments - i) * ledFactor_div_numOfSegments), 0); 
      }
      break;
    }

    case 1: {
      for (i = 0; i <= numOfSegments; i++) {
        stripColor[i] = left_strip.Color(0, (255 * i * ledFactor_div_numOfSegments), (255 * (numOfSegments - i) * ledFactor_div_numOfSegments)); 
      }
      break;
    }

    case 2: {
      for (i = 0; i <= numOfSegments; i++) {
        stripColor[i] = left_strip.Color((255 * i * ledFactor_div_numOfSegments), 0, (255 * (numOfSegments - i) * ledFactor_div_numOfSegments)); 
      }
      break;
    }

    case 3: {
      for (i = 0; i <= numOfSegments; i++) {
        stripColor[i] = left_strip.Color((255 * (numOfSegments - i) * ledFactor_div_numOfSegments), 0, (255 * i * ledFactor_div_numOfSegments)); 
      }
      break;
    }

    case 4: {
      for (i = 0; i <= numOfSegments; i++) {
        stripColor[i] = left_strip.Color(0, (255 * (numOfSegments - i) * ledFactor_div_numOfSegments), (255 * i * ledFactor_div_numOfSegments)); 
      }
      break;
    }

    case 5: {
      for (i = 0; i <= numOfSegments; i++) {
        stripColor[i] = left_strip.Color((255 * (numOfSegments - i) * ledFactor_div_numOfSegments), (255 * i * ledFactor_div_numOfSegments), 0); 
      }
      break;
    }

    case 6: {
      for (i = 0; i <= numOfSegments; i++) {
        r = (255 * i * ledFactor_div_numOfSegments);
        g = (255 * min(i, numOfSegments - i) * ledFactor_div_numOfSegments);
        b = (200 * (numOfSegments - i) * ledFactor_div_numOfSegments); 
        stripColor[i] = left_strip.Color(r, g, b); 
      }
      break;
    }

    case 7: {
      for (i = 0; i <= numOfSegments; i++) {
        b = (255 * i * ledFactor_div_numOfSegments);
        g = (255 * min(i, numOfSegments - i) * ledFactor_div_numOfSegments);
        r = (255 * (numOfSegments - i) * ledFactor_div_numOfSegments); 
        stripColor[i] = left_strip.Color(r, g, b); 
      }
      break;
    }

    case 8: {
      for (i = 0; i <= numOfSegments; i++) {
        r = (255 * i * ledFactor_div_numOfSegments);
        b = (255 * min(i, numOfSegments - i) * ledFactor_div_numOfSegments);
        g = (255 * (numOfSegments - i) * ledFactor_div_numOfSegments); 
        stripColor[i] = left_strip.Color(r, g, b); 
      }
      break;
    }

    case 9: {
      for (i = 0; i <= numOfSegments; i++) {
        b = (255 * i * ledFactor_div_numOfSegments);
        r = (255 * min(i, numOfSegments - i) * ledFactor_div_numOfSegments);
        g = (255 * (numOfSegments - i) * ledFactor_div_numOfSegments); 
        stripColor[i] = left_strip.Color(r, g, b); 
      }
      break;
    }

    case 10: 
      colorScheme11SpinValue = 0;
      
    case 11:     
    
    case 12: {
      p1 = (85 * numOfSegments / 255);
      p2 = (170 * numOfSegments / 255);
      int wheel;

      if (colorScheme == 12)
        colorSchemeFactor = colorScheme12Factor;        
      else
        colorSchemeFactor = 1;
            
      for (i = 0; i <= numOfSegments; i++) {  
        //wheel = int(float(i + colorScheme11SpinValue) / colorSchemeFactor) % numOfSegments;  // reverse wheel
        
        wheel = int(float(i - colorScheme11SpinValue) / colorSchemeFactor + numOfSegments) % numOfSegments;

        if (wheel < p1) {          
          wheel = map(wheel, 0, p1, 0, 255);
          r = (wheel * ledFactor);
          g = ((255 - wheel) * ledFactor);
          b = 0;
        } 
        else if (wheel < p2) {
          wheel = map(wheel, p1, p2, 0, 255);
          r = ((255 - wheel) * ledFactor);
          g = 0;
          b = (wheel * ledFactor);
        } 
        else {
          wheel = map(wheel, p2, numOfSegments, 0, 255);
          r = 0;
          g = (wheel * ledFactor);
          b = ((255 - wheel) * ledFactor);
        }        

        stripColor[i] = left_strip.Color(r, g, b); 
      }
      break;
    }
  }

  if (colorScheme >= 10)
    stripHoldColor = left_strip.Color(255 * ledFactor, 0, 0); // set to red for the color wheels
  else
    stripHoldColor = stripColor[numOfSegments];
    
  stripOverflowColor = stripHoldColor;   // left_strip.Color(min(255, 255 * ledFactor * 1.5), 0, 0);
}

void startupAnimation() {  
  for (j = 0; j < 2; j++) {
    for (i = 0; i <= numOfSegments; i++) {
      if (animType == 1)
        left_strip.setPixelColor(stripMiddle - (numOfSegments - i), stripColor[i]);
      else
        left_strip.setPixelColor(stripMiddle - i, stripColor[i]);
      
      if (stripsOn2Pins)
        right_strip.setPixelColor(i, stripColor[i]);
      else
        left_strip.setPixelColor(stripMiddle + i, stripColor[i]);

      left_strip.show();
      if (stripsOn2Pins)
        right_strip.show();  
      
      delay(startupAnimationDelay);
    }
    
    for (i = 0; i <= numOfSegments; i++) {
      if (animType == 1)
        left_strip.setPixelColor(stripMiddle - (numOfSegments - i), 0);
      else
        left_strip.setPixelColor(stripMiddle - i, 0);
        
      if (stripsOn2Pins)
        right_strip.setPixelColor(i, 0);
      else
        left_strip.setPixelColor(stripMiddle + i, 0);

      left_strip.show();
      if (stripsOn2Pins)
        right_strip.show();  
      
      delay(startupAnimationDelay);
    }
  }
}

void displayNumber (int number, int displayDelay) {
  left_strip.clear();
  if (stripsOn2Pins)
    right_strip.clear();

  number++; // @EB_DEBUG : display value 0 at led 1
  
  for (i = 0; i <= number; i++) {
    if (i % 5 == 0) 
      colorValue = stripMiddleColor;
    else
      colorValue = stripColor[0];

    left_strip.setPixelColor(middleOffset + i, colorValue);

    if (stripsOn2Pins)
      right_strip.setPixelColor(middleOffset + i, colorValue);
    else
      left_strip.setPixelColor(stripMiddle + middleOffset + i, colorValue);

    delay(45 - number * 3); // @EB_DEBUG
    
    left_strip.show();
    if (stripsOn2Pins)
      right_strip.show();  
  }

  if (pulsing) {
    left_strip.setPixelColor(middleOffset + maxDisplaySegments, stripMiddleColor);

    if (stripsOn2Pins)
      right_strip.setPixelColor(maxDisplaySegments, stripMiddleColor);
    else
      left_strip.setPixelColor(stripMiddle + maxDisplaySegments, stripMiddleColor);

    left_strip.show();
    if (stripsOn2Pins)
      right_strip.show();  
  }

  delay(displayDelay);

  left_strip.clear();
  if (stripsOn2Pins)
    right_strip.clear();
}


//
// for debugging
//

#ifdef DEBUG_TEST_LEDS
  void displayTest() {
    for (i = 0; i <= numOfSegments; i++) {
      left_strip.setPixelColor(stripMiddle - i, stripColor[i]);

      if (stripsOn2Pins)
        right_strip.setPixelColor(i, stripColor[i]);
      else
        left_strip.setPixelColor(stripMiddle + i, stripColor[i]);

      left_strip.show();
      if (stripsOn2Pins)
        right_strip.show();  

      delay(50);
    }
    delay(5000);
  
    for (i = 0; i <= numOfSegments; i++) {
      left_strip.setPixelColor(stripMiddle - i, 0);

      if (stripsOn2Pins)
        right_strip.setPixelColor(i, 0);
      else
        left_strip.setPixelColor(stripMiddle + i, 0);

      left_strip.show();
      if (stripsOn2Pins)
        right_strip.show();  
    }
  }
  
  void serialDisplayRGB(int r, int g, int b) {
    Serial.print(i);
    Serial.print(" ");
    Serial.print(r);
    Serial.print(" ");
    Serial.print(g);
    Serial.print(" ");
    Serial.println(b);
  }
#endif

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