Infinity Mirror VU Meter Music Equalizer

Infinity mirror VU meter music equalizer is inspired by our infinity mirror clock project and we present it to our precious viewers.

Apr 1, 2018

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infinity mirror

music

clocks

Devices & Components

Arduino Nano

NeoPixel strip

Barrel Jack Female Pigtail Lead 2.1 - 5.5mm

Rotary potentiometer (generic)

Resistor 475 ohm

Resistor 10k ohm

Hardware & Tools

Soldering iron (generic)

Project description

Code

arduino

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*  Last updated 20171105 by ericBcreator
7*
8* This code is free for personal use,  not for commercial purposes.
9* Please leave this header intact.
10*
11* contact:  ericBcreator@gmail.com
12**********************************************************************
13*/
14
15//#define  DEBUG                                             // for debugging
16
17//
18//  include the NeoPixel library:
19//
20
21#include <Adafruit_NeoPixel.h>
22
23//
24//  uncomment the definition for the connected strip or ring(s)
25//
26
27//#define  led_ring_60
28//#define led_strip_60
29//#define led_strip_30
30//#define led_2_rings_24
31#define  led_2_rings_30
32//#define led_strip_200
33//#define led_strip_144
34
35//
36//  important setting: using potentiometer sensor values or not
37// This setting has  to be set right or the script will not work correctly:
38// - set this to true  if using potentiometers
39// - set this to false if not using potentiometers
40//
41
42const  int useSensorValues = true;                         
43
44//
45// setup pins
46//
47
48int  leftPin = A0, rightPin = A1;                          // left audio in on analog  0, right on analog 1
49int brightnessPin = A4, sensitivityPin = A5;              //  potentiometers for brightness and sensitivity on analog 4 and 5
50int stripPin  = 6;                                         // DIN of leds on digital pin 6
51int  showPeaksPin = 7;                                     // switch to toggle peaks  on or off on digital pin 7
52int momentarySwitch = false;                              //  set false for an on/off toggle switch
53
54//
55// setup variables for the number  of leds and led strip or 2 rings
56//
57
58#if defined (led_ring_60)
59  //settings  for a 60 led ring
60
61  int stripNumOfLeds = 32;                                  //  the total number of leds         60   idi
62  uint32_t stripColor[17];                                  //  half of the number of leds + 1   32 idi
63  int displayMiddleLed = false;                             //  display the middle led (blue). set to true for one strip, false for two strips or  rings
64  int splitStrip = true;                                    // set to true  when using 2 strips or rings, false for one strip
65  int middleOffset = 0;                                     //  offset for the middle led when using one strip
66  int startupAnimationDelay =  6;                            // delay for the startup animation
67  int orangeLimitAmount  = 0;                                // limit the amount of green of the middle LEDs  to make them more orange
68  int swapLeftRight = false;                                //  swap the left and right input values or not
69  
70  int dropDelay = 4;                                        //  hold time before dropping the leds
71  float dropFactor = .92;                                   //  value for dropping the leds
72  
73  int peakTimeNoDropDelay = 250;                            //  peak hold time when not dropping the peaks (set droppingPeak true or false)
74  int peakTimeFirstDropDelay = 130;                         // peak hold time when  dropping the first peak
75  int peakTimeDropDelay = 7;                                //  peak hold time when dropping the rest of the peaks
76  float peakDropFactor = .93;                               // value for dropping the peaks
77  int droppingPeakFade  = false;                             // display the dropping peak fading to black  or not
78  
79  int bouncingPeaksNumOfLeds = 6;                           // how  many leds to bounce up (max)
80  int bouncingPeakDelay = 4;                                //  delay between peak bounce updates
81  int bouncingPeakCounterInc = 10;                          //  increase counter for each bounce update. note: it uses a 0-180 sin function for  the bouncing
82
83#elif defined (led_strip_60)
84  //settings for a 60 led ring
85
86  int stripNumOfLeds = 60;                                  // the total number  of leds
87  uint32_t stripColor[31];                                  // half of  the number of leds + 1
88  int displayMiddleLed = true;                              //  display the middle led (blue). set to true for one strip, false for two strips or  rings
89  int splitStrip = false;                                   // set to true  when using 2 strips or rings, false for one strip
90  int middleOffset = 1;                                     //  offset for the middle led when using one strip
91  int startupAnimationDelay =  6;                            // delay for the startup animation
92  int orangeLimitAmount  = 0;                                // limit the amount of green of the middle LEDs  to make them more orange
93  int swapLeftRight = false;                                //  swap the left and right input values or not
94  
95  int dropDelay = 4;                                        //  hold time before dropping the leds
96  float dropFactor = .92;                                   //  value for dropping the leds
97  
98  int peakTimeNoDropDelay = 250;                            //  peak hold time when not dropping the peaks (set droppingPeak true or false)
99  int peakTimeFirstDropDelay = 130;                         // peak hold time when  dropping the first peak
100  int peakTimeDropDelay = 7;                                //  peak hold time when dropping the rest of the peaks
101  float peakDropFactor = .93;                               // value for dropping the peaks
102  int droppingPeakFade  = false;                             // display the dropping peak fading to black  or not
103  
104  int bouncingPeaksNumOfLeds = 6;                           // how  many leds to bounce up (max)
105  int bouncingPeakDelay = 4;                                //  delay between peak bounce updates
106  int bouncingPeakCounterInc = 10;                          //  increase counter for each bounce update. note: it uses a 0-180 sin function for  the bouncing
107
108#elif defined (led_strip_30)
109  //settings for a 30 led strip
110
111  int stripNumOfLeds = 30;                                  // the total number  of leds
112  uint32_t stripColor[16];                                  // half of  the number of leds + 1
113  int displayMiddleLed = true;                              //  display the middle led (blue). set to true for one strip, false for two strips or  rings
114  int splitStrip = false;                                   // set to true  when using 2 strips or rings, false for one strip
115  int middleOffset = 1;                                     //  offset for the middle led when using one strip
116  int startupAnimationDelay =  10;                           // delay for the startup animation
117  int orangeLimitAmount  = 0;                                // limit the amount of green of the middle LEDs  to make them more orange
118  int swapLeftRight = false;                                //  swap the left and right input values or not
119  
120  int dropDelay = 10;                                       //  hold time before dropping the leds
121  float dropFactor = .9;                                    //  value for dropping the leds
122  
123  int peakTimeNoDropDelay = 250;                            //  peak hold time when not dropping the peaks (set droppingPeak true or false)
124  int peakTimeFirstDropDelay = 150;                         // peak hold time when  dropping the first peak
125  int peakTimeDropDelay = 15;                               //  peak hold time when dropping the rest of the peaks
126  float peakDropFactor = .94;                               // value for dropping the peaks
127  int droppingPeakFade  = false;                             // display the dropping peak fading to black  or not
128  
129  int bouncingPeaksNumOfLeds = 3;                           // how  many leds to bounce up (max)
130  int bouncingPeakDelay = 4;                                //  delay between peak bounce updates
131  int bouncingPeakCounterInc = 9;                           //  increase counter for each bounce update. note: it uses a 0-180 sin function for  the bouncing
132
133#elif defined (led_2_rings_24)
134  //settings for 2 24 led  rings
135
136  int stripNumOfLeds = 48;
137  uint32_t stripColor[25];
138  int displayMiddleLed  = false;
139  int splitStrip = true;
140  int middleOffset = 0;
141  int startupAnimationDelay  = 5;
142  int orangeLimitAmount = 0;
143  int swapLeftRight = false;
144  
145  int  dropDelay = 2;
146  float dropFactor = .96;
147  
148  int peakTimeNoDropDelay =  250;
149  int peakTimeFirstDropDelay = 100;
150  int peakTimeDropDelay = 10;
151  float peakDropFactor = .94;
152  int droppingPeakFade = false;
153  
154  int  bouncingPeaksNumOfLeds = 3;
155  int bouncingPeakDelay = 4;
156  int bouncingPeakCounterInc  = 9;
157
158#elif defined(led_2_rings_30)
159  //settings for 2 30 led rings
160
161  int stripNumOfLeds = 60;
162  uint32_t stripColor[31];
163  int displayMiddleLed  = false;
164  int splitStrip = true;
165  int middleOffset = 0;
166  int startupAnimationDelay  = 5;
167  int orangeLimitAmount = 0;
168  int swapLeftRight = false;
169  
170  int  dropDelay = 2;
171  float dropFactor = .96;
172  
173  int peakTimeNoDropDelay =  250;
174  int peakTimeFirstDropDelay = 100;
175  int peakTimeDropDelay = 10;
176  float peakDropFactor = .94;
177  int droppingPeakFade = false;
178  
179  int  bouncingPeaksNumOfLeds = 3;
180  int bouncingPeakDelay = 4;
181  int bouncingPeakCounterInc  = 9;
182
183#elif defined (led_strip_200)
184  //settings for a 200 led strip
185
186  int stripNumOfLeds = 200;
187  uint32_t stripColor[101];
188  int displayMiddleLed  = false;
189  int splitStrip = true;
190  int middleOffset = 0;
191  int startupAnimationDelay  = 1;
192  int orangeLimitAmount = 0;
193  int swapLeftRight = false;
194  
195  int  dropDelay = 10;
196  float dropFactor = .96;
197  
198  int peakTimeNoDropDelay  = 250;
199  int peakTimeFirstDropDelay = 100;
200  int peakTimeDropDelay = 30;
201  float peakDropFactor = .99;
202  int droppingPeakFade = false;
203  
204  int  bouncingPeaksNumOfLeds = 8;
205  int bouncingPeakDelay = 4;
206  int bouncingPeakCounterInc  = 9;
207
208#elif defined (led_strip_144)
209  //settings for a 200 led strip
210
211  int stripNumOfLeds = 145;
212  uint32_t stripColor[73];
213  int displayMiddleLed  = true;
214  int splitStrip = false;
215  int middleOffset = 1;
216  int startupAnimationDelay  = 1;
217  int orangeLimitAmount = 0;
218  int swapLeftRight = false;
219  
220  int  dropDelay = 10;
221  float dropFactor = .85;
222  
223  int peakTimeNoDropDelay  = 250;
224  int peakTimeFirstDropDelay = 100;
225  int peakTimeDropDelay = 5;
226  float peakDropFactor = .94;
227  int droppingPeakFade = false;
228  
229  int  bouncingPeaksNumOfLeds = 10;
230  int bouncingPeakDelay = 2;
231  int bouncingPeakCounterInc  = 10;
232#endif
233
234//
235// setup other variables, user editable
236//
237
238//  basic settings
239int minValue = 5;                                        // min  analog input value
240int maxValue = 250;                                       //  max analog input value (0-1023 equals 0-5V)
241int sensitivityValue = 255;                               //  0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
242int  maxSensitivity = 2 * 255;                             // let the 'volume' go up  to 200%!
243int ledBrightness = 30;                                   // 0 - 255,  initial value (value read from the potentiometer if useSensorValues = true)
244int  sensorDeviationBrightness = 1;                        // eliminate fluctuating values
245int  overflowDelay = 20;                                   // overflow hold time
246
247//  peak settings
248int displayPeaks = true;                                  // value  will be set by the switch if useSensorValues = true
249int droppingPeak = true;                                  // display dropping peaks or not. note: displayPeaks  has to be true 
250int bouncingPeaks = true;                                 //  display bouncing peaks or not. note: displayPeaks has to be true 
251
252//
253//  initialize other variables needed for the sketch
254//
255
256int numOfSegments  = stripNumOfLeds / 2;
257int halfNumOfSegments = numOfSegments / 2; 
258int stripMiddle  = stripNumOfLeds / 2;
259int maxDisplaySegments = stripMiddle - 1;
260float sensitivityFactor;
261
262int  brightnessValue, prevBrightnessValue;
263float ledFactor, ledFactor_div_numOfSegments;
264
265int  leftValue = 0, rightValue = 0, maxReadValue = 0;
266int leftAnalogValue = 0, rightAnalogValue  = 0;
267
268int prevLeftValue = 0, prevRightValue = 0;
269int prevLeftAnalogValue  = 0, prevRightAnalogValue = 0;
270
271int i, j;
272int dropLeft, dropRight;
273int  leftDropTime, rightDropTime;
274
275int leftPeak = 0, rightPeak = 0;
276int leftPeakTime  = 0, rightPeakTime = 0;
277int leftFirstPeak = true, rightFirstPeak = true;
278int  readShowPeaksPin, prevReadShowPeaksPin;
279
280uint32_t stripMiddleColor, stripOverflowColor,  stripHoldColor;
281
282int leftPeakBouncing = false, rightPeakBouncing = false;
283int  leftPeakBounce = 0, rightPeakBounce = 0;
284int prevLeftPeakBounce = 0, prevRightPeakBounce  = 0;
285int leftPeakBounceCounter = 0, rightPeakBounceCounter = 0;
286int leftPeakBounceDelayCounter  = 0, rightPeakBounceDelayCounter = 0;
287
288//
289// initialize the strip or rings
290//
291
292Adafruit_NeoPixel  strip = Adafruit_NeoPixel(stripNumOfLeds, stripPin, NEO_GRB + NEO_KHZ800);
293
294//
295//  setup
296//
297
298void setup() {
299  #ifdef DEBUG
300    Serial.begin(9600);
301  #endif
302  
303  pinMode(showPeaksPin, INPUT);  
304
305  strip.begin();
306  
307  setStripColors();
308  startupAnimation();
309  
310  if (useSensorValues)  
311    setInitialDisplayPeaks();
312  else
313    setSensitivityFactor();
314}
315
316//
317//  main loop
318//
319
320void loop() {
321  if (useSensorValues) 
322    readSensorValues();
323  
324  readValues();
325  drawValues();
326
327  if (displayPeaks) {
328    getPeaks();
329    drawPeaks();
330  }
331
332  storePrevValues();
333}
334
335// 
336// functions
337//
338
339void  setInitialDisplayPeaks() {
340  readShowPeaksPin = digitalRead(showPeaksPin);
341  if (readShowPeaksPin == HIGH)
342    displayPeaks = false;
343  else
344    displayPeaks  = true;
345  prevReadShowPeaksPin = readShowPeaksPin;
346}
347
348void readSensorValues()  {
349  readShowPeaksPin = digitalRead(showPeaksPin);
350
351  if (momentarySwitch)  {
352    if (readShowPeaksPin == LOW && prevReadShowPeaksPin == HIGH) {
353      if  (displayPeaks == true) {
354        displayPeaks = false;
355        clearLeftPeak();
356        clearRightPeak();        
357        if (momentarySwitch)
358          while  (digitalRead(showPeaksPin) == LOW) {}
359      }
360      else {
361        displayPeaks  = true;
362      }
363    }
364  } 
365  else {
366    if (readShowPeaksPin == LOW  && prevReadShowPeaksPin == HIGH) 
367      displayPeaks = true;
368    else if (readShowPeaksPin  == HIGH && prevReadShowPeaksPin == LOW) {
369      displayPeaks = false;
370      clearLeftPeak();
371      clearRightPeak();        
372    }
373  }
374  prevReadShowPeaksPin = readShowPeaksPin;
375  
376  brightnessValue = analogRead(brightnessPin);
377  brightnessValue = map(brightnessValue,  0, 1023, 0, 255);
378  
379  if (abs(brightnessValue - prevBrightnessValue) > sensorDeviationBrightness)  {
380    ledBrightness = brightnessValue;
381    setStripColors();
382    prevBrightnessValue  = brightnessValue;
383  }
384
385  sensitivityValue = analogRead(sensitivityPin);
386  sensitivityValue = map(sensitivityValue, 0, 1023, 0, 255);
387  setSensitivityFactor();
388}
389
390void  setSensitivityFactor() {
391  //sensitivityValue_div_numOfSegments = sensitivityValue  / numOfSegments;
392  sensitivityFactor = ((float) sensitivityValue / 255 * (float)  maxSensitivity / 255);
393}
394
395void readValues() {
396  leftAnalogValue = analogRead(leftPin);
397  rightAnalogValue = analogRead(rightPin);
398
399  if (swapLeftRight) {
400    int  tempValue = leftAnalogValue;
401    leftAnalogValue = rightAnalogValue;
402    rightAnalogValue  = tempValue;
403  }
404
405  if (leftAnalogValue < prevLeftAnalogValue) {
406    leftDropTime++;
407    if (leftDropTime > dropDelay) {
408      leftAnalogValue = prevLeftAnalogValue  * dropFactor;
409      leftDropTime = 0;
410    }
411    else
412      leftAnalogValue  = prevLeftAnalogValue;
413  }
414   
415  if (rightAnalogValue < prevRightAnalogValue)  {
416    rightDropTime++;
417    if (rightDropTime > dropDelay) {
418      rightAnalogValue  = prevRightAnalogValue * dropFactor;
419      rightDropTime = 0;
420    }
421    else
422      rightAnalogValue = prevRightAnalogValue;
423  }
424
425  #ifdef DEBUG
426    Serial.print(leftAnalogValue);
427    Serial.print(" ");
428    Serial.println(rightAnalogValue);
429  #endif  
430
431  // map values  
432  leftValue = map(leftAnalogValue * sensitivityFactor,  minValue, maxValue, 0, maxDisplaySegments);
433  rightValue = map(rightAnalogValue  * sensitivityFactor, minValue, maxValue, 0, maxDisplaySegments);
434
435  if (leftValue  > maxDisplaySegments) {
436      leftValue = maxDisplaySegments;
437      drawOverflow();
438  }
439  
440  if (rightValue > maxDisplaySegments) {
441      rightValue = maxDisplaySegments;
442      drawOverflow();
443  }
444}
445
446void storePrevValues() {
447  prevLeftAnalogValue  = leftAnalogValue;
448  prevRightAnalogValue = rightAnalogValue;
449
450  prevLeftValue  = leftValue;
451  prevRightValue = rightValue;
452}
453
454void getPeaks() {
455  if (leftValue > leftPeak) {
456    leftPeak = leftValue;
457    leftPeakTime =  0;
458    leftFirstPeak = true;
459
460    if (bouncingPeaks) {
461      leftPeakBouncing  = true;
462      leftPeakBounceCounter = 0;
463      leftPeakBounceDelayCounter  = 0;
464    }
465  }
466  else {
467    leftPeakTime++;
468    if (droppingPeak)  {
469      if (leftFirstPeak) {
470        if (leftPeakTime > peakTimeFirstDropDelay)  {
471          clearLeftPeak();
472          leftFirstPeak = false;
473        }
474      }
475      else {
476        if (leftPeakTime > peakTimeDropDelay) {
477          clearLeftPeak();
478        }
479      }
480    }
481    else {
482      if (leftPeakTime > peakTimeNoDropDelay)  {
483        clearLeftPeak();
484      }
485    }
486  }
487
488  if (leftPeakBouncing)  {
489    if (leftFirstPeak) {
490      leftPeakBounceDelayCounter++;
491      if  (leftPeakBounceDelayCounter >= bouncingPeakDelay) {
492        leftPeakBounceDelayCounter  = 0;
493        leftPeakBounceCounter += bouncingPeakCounterInc;
494  
495        if  (leftPeakBounceCounter >= 180) {
496          clearLeftBouncePeak();
497          clearLeftBounce();
498        }
499        else {        
500          leftPeakBounce = min((sin(leftPeakBounceCounter  * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - leftPeak));
501          if (leftPeakBounce != prevLeftPeakBounce) {
502            clearLeftBouncePeak();
503          }
504          prevLeftPeakBounce = leftPeakBounce;
505        }
506      }
507    }
508  }
509
510  if (rightValue > rightPeak) {
511    rightPeak = rightValue;
512    rightPeakTime = 0;
513    rightFirstPeak = true;
514
515    if (bouncingPeaks)  {
516      rightPeakBouncing = true;
517      rightPeakBounceCounter = 0;
518      rightPeakBounceDelayCounter  = 0;
519    }
520  }
521  else {
522    rightPeakTime++;
523    if (droppingPeak)  {
524      if (rightFirstPeak) {
525        if (rightPeakTime > peakTimeFirstDropDelay)  {
526          clearRightPeak();
527          rightFirstPeak = false;
528        }
529      }
530      else {
531        if (rightPeakTime > peakTimeDropDelay)
532          clearRightPeak();
533      }
534    }
535    else {
536      if (rightPeakTime > peakTimeNoDropDelay)
537        clearRightPeak();
538    }
539  }
540
541  if (rightPeakBouncing) {
542    if (rightFirstPeak) {
543      rightPeakBounceDelayCounter++;
544      if (rightPeakBounceDelayCounter  >= bouncingPeakDelay) {
545        rightPeakBounceDelayCounter = 0;
546        rightPeakBounceCounter  += bouncingPeakCounterInc;
547  
548        if (rightPeakBounceCounter >= 180) {
549          clearRightBouncePeak();
550          clearRightBounce();
551        }
552        else {        
553          rightPeakBounce = min((sin(rightPeakBounceCounter  * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - rightPeak));
554          if (rightPeakBounce != prevRightPeakBounce) {
555            clearRightBouncePeak();
556          }
557          prevRightPeakBounce = rightPeakBounce;
558        }
559      }
560    }
561  }
562}
563
564void drawValues() {
565  if (splitStrip) {
566    for (i = middleOffset; i < leftValue; i++)
567      strip.setPixelColor(i, stripColor[i]);
568  
569    for (i = prevLeftValue; i > leftValue; i--)
570      strip.setPixelColor(i,  0);
571  
572    for (i = middleOffset; i < rightValue; i++)
573      strip.setPixelColor(stripMiddle  + i, stripColor[i]);
574  
575    for (i = prevRightValue; i > rightValue; i--)
576      strip.setPixelColor(stripMiddle + i, 0);
577  }
578  else {
579    for (i  = middleOffset; i < leftValue; i++)
580      strip.setPixelColor(stripMiddle + i,  stripColor[i]);
581  
582    for (i = prevLeftValue; i > leftValue; i--)
583      strip.setPixelColor(stripMiddle  + i, 0);
584  
585    for (i = middleOffset; i < rightValue; i++)
586      strip.setPixelColor(stripMiddle  - i, stripColor[i]);
587  
588    for (i = prevRightValue; i > rightValue; i--)
589      strip.setPixelColor(stripMiddle - i, 0);
590  }
591
592  if (displayMiddleLed)  strip.setPixelColor(stripMiddle, stripMiddleColor);
593  strip.show();
594}
595
596void  drawPeaks() {
597  if (leftPeak > 0) {
598    if (droppingPeakFade && leftPeakBouncing  == false)
599      stripHoldColor = strip.Color(max(1, (255 * leftPeak * ledFactor_div_numOfSegments)),  0, 0);
600    else
601      stripHoldColor = stripColor[numOfSegments];
602
603    if (splitStrip)
604      strip.setPixelColor((leftPeak + leftPeakBounce), stripHoldColor);
605    else
606      strip.setPixelColor(stripMiddle + (leftPeak + leftPeakBounce),  stripHoldColor);
607  } 
608  
609  if (rightPeak > 0) {
610    if (droppingPeakFade  && rightPeakBouncing == false)
611      stripHoldColor = strip.Color(max(1, (255  * rightPeak * ledFactor_div_numOfSegments)), 0, 0);    
612    else
613      stripHoldColor  = stripColor[numOfSegments];
614
615    if (splitStrip)
616      strip.setPixelColor(stripMiddle  + rightPeak + prevRightPeakBounce, stripHoldColor);
617    else 
618      strip.setPixelColor(stripMiddle  - (rightPeak + prevRightPeakBounce), stripHoldColor);
619  }
620
621  if (leftPeak  > 0 || rightPeak > 0)
622    strip.show();    
623}
624
625void clearLeftPeak()  {
626  if (splitStrip)
627    strip.setPixelColor((leftPeak + prevLeftPeakBounce),  0);
628  else
629    strip.setPixelColor(stripMiddle + (leftPeak + prevLeftPeakBounce),  0);
630
631  if (droppingPeak)
632    leftPeak = leftPeak * peakDropFactor;
633  else
634    leftPeak = 0;
635  leftPeakTime = 0;
636}
637
638void clearLeftBounce()  {
639  leftPeakBouncing = false;
640  leftPeakBounceCounter = 0;
641  leftPeakBounce  = 0;
642  prevLeftPeakBounce = 0;
643}
644
645void clearLeftBouncePeak() {
646  if  (splitStrip)
647    strip.setPixelColor((leftPeak + prevLeftPeakBounce), 0);
648  else
649    strip.setPixelColor(stripMiddle + (leftPeak + prevLeftPeakBounce),  0);
650}
651
652void clearRightPeak() {
653  if (splitStrip)
654    strip.setPixelColor(stripMiddle  + rightPeak + prevRightPeakBounce, 0);
655  else 
656    strip.setPixelColor(stripMiddle  - (rightPeak + prevRightPeakBounce), 0);
657  
658  if (droppingPeak)
659    rightPeak  = rightPeak * peakDropFactor;
660  else
661    rightPeak = 0;
662  rightPeakTime  = 0;
663}
664
665void clearRightBounce() {
666  rightPeakBouncing = false;
667  rightPeakBounceCounter  = 0;
668  rightPeakBounce = 0;
669  prevRightPeakBounce = 0;
670}
671
672void clearRightBouncePeak()  {
673  if (splitStrip)
674    strip.setPixelColor((stripMiddle + rightPeak + prevRightPeakBounce),  0);
675  else
676    strip.setPixelColor(stripMiddle - (rightPeak + prevRightPeakBounce),  0);
677}
678
679void drawOverflow() {
680  for (i = 0; i <= numOfSegments; i++)  {
681    strip.setPixelColor(stripMiddle + i, stripOverflowColor);
682    strip.setPixelColor(stripMiddle  - i, stripOverflowColor);
683  }
684  strip.show();
685  delay(overflowDelay);
686
687  for (i = 0; i <= numOfSegments; i++) {
688    strip.setPixelColor(stripMiddle  + i, 0);
689    strip.setPixelColor(stripMiddle - i, 0);
690  }
691  strip.show();
692}
693
694void  setStripColors() {
695  int orangeLimit;
696  ledFactor = (float)ledBrightness /  255;
697
698  float orangeFactor = orangeLimitAmount / halfNumOfSegments;
699  ledFactor_div_numOfSegments  = ledFactor / numOfSegments;
700  
701  stripOverflowColor = strip.Color(min(255,  255 * ledFactor * 1.5), 0, 0);
702  stripMiddleColor = strip.Color(0, 0, 255 * ledFactor);
703
704  stripColor[0] = strip.Color(0, 255 * ledFactor, 0);
705  for (i = 1; i <= numOfSegments;  i++) {
706    if (i <= halfNumOfSegments)
707      orangeLimit = (i * orangeFactor);
708    else
709      orangeLimit = ((numOfSegments - i) * orangeFactor);
710
711    stripColor[i]  = strip.Color((255 * i * ledFactor_div_numOfSegments), ((255 - orangeLimit) * (numOfSegments  - i) * ledFactor_div_numOfSegments), 0); 
712  }
713
714  stripHoldColor = stripColor[numOfSegments];
715}
716
717void  startupAnimation() {  
718  for (j = 0; j < 2; j++) {
719    for (i = 0; i <= numOfSegments;  i++) {
720      strip.setPixelColor(stripMiddle - i, stripColor[i]);
721      strip.setPixelColor(stripMiddle  + i, stripColor[i]);
722      strip.show();
723      delay(startupAnimationDelay);
724    }
725    
726    for (i = 0; i <= numOfSegments; i++) {
727      strip.setPixelColor(stripMiddle  + i, 0);
728      strip.setPixelColor(stripMiddle - i, 0);
729      strip.show();
730      delay(startupAnimationDelay);
731    }
732  }
733}
734

/*
**********************************************************************
*  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.
**********************************************************************
*  Last updated 20171105 by ericBcreator
*
* This code is free for personal use,  not for commercial purposes.
* Please leave this header intact.
*
* contact:  ericBcreator@gmail.com
**********************************************************************
*/

//#define  DEBUG                                             // for debugging

//
//  include the NeoPixel library:
//

#include <Adafruit_NeoPixel.h>

//
//  uncomment the definition for the connected strip or ring(s)
//

//#define  led_ring_60
//#define led_strip_60
//#define led_strip_30
//#define led_2_rings_24
#define  led_2_rings_30
//#define led_strip_200
//#define led_strip_144

//
//  important setting: using potentiometer sensor values or not
// This setting has  to be set right or the script will not work correctly:
// - set this to true  if using potentiometers
// - set this to false if not using potentiometers
//

const  int useSensorValues = true;                         

//
// 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 stripPin  = 6;                                         // DIN of leds on digital pin 6
int  showPeaksPin = 7;                                     // switch to toggle peaks  on or off on digital pin 7
int momentarySwitch = false;                              //  set false for an on/off toggle switch

//
// setup variables for the number  of leds and led strip or 2 rings
//

#if defined (led_ring_60)
  //settings  for a 60 led ring

  int stripNumOfLeds = 32;                                  //  the total number of leds         60   idi
  uint32_t stripColor[17];                                  //  half of the number of leds + 1   32 idi
  int displayMiddleLed = false;                             //  display the middle led (blue). set to true for one strip, false for two strips or  rings
  int splitStrip = true;                                    // set to true  when using 2 strips or rings, false for one strip
  int middleOffset = 0;                                     //  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 = 4;                                        //  hold time before dropping the leds
  float dropFactor = .92;                                   //  value for dropping the leds
  
  int peakTimeNoDropDelay = 250;                            //  peak hold time when not dropping the peaks (set droppingPeak true or false)
  int peakTimeFirstDropDelay = 130;                         // peak hold time when  dropping the first peak
  int peakTimeDropDelay = 7;                                //  peak hold time when dropping the rest of the peaks
  float peakDropFactor = .93;                               // 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 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_strip_60)
  //settings for a 60 led ring

  int stripNumOfLeds = 60;                                  // the total number  of leds
  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 = 4;                                        //  hold time before dropping the leds
  float dropFactor = .92;                                   //  value for dropping the leds
  
  int peakTimeNoDropDelay = 250;                            //  peak hold time when not dropping the peaks (set droppingPeak true or false)
  int peakTimeFirstDropDelay = 130;                         // peak hold time when  dropping the first peak
  int peakTimeDropDelay = 7;                                //  peak hold time when dropping the rest of the peaks
  float peakDropFactor = .93;                               // 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 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_strip_30)
  //settings for a 30 led strip

  int stripNumOfLeds = 30;                                  // the total number  of leds
  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 = 3;                           // how  many leds to bounce up (max)
  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_rings_24)
  //settings for 2 24 led  rings

  int stripNumOfLeds = 48;
  uint32_t stripColor[25];
  int displayMiddleLed  = false;
  int splitStrip = true;
  int middleOffset = 0;
  int startupAnimationDelay  = 5;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int  dropDelay = 2;
  float dropFactor = .96;
  
  int peakTimeNoDropDelay =  250;
  int peakTimeFirstDropDelay = 100;
  int peakTimeDropDelay = 10;
  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int  bouncingPeaksNumOfLeds = 3;
  int bouncingPeakDelay = 4;
  int bouncingPeakCounterInc  = 9;

#elif defined(led_2_rings_30)
  //settings for 2 30 led rings

  int stripNumOfLeds = 60;
  uint32_t stripColor[31];
  int displayMiddleLed  = false;
  int splitStrip = true;
  int middleOffset = 0;
  int startupAnimationDelay  = 5;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int  dropDelay = 2;
  float dropFactor = .96;
  
  int peakTimeNoDropDelay =  250;
  int peakTimeFirstDropDelay = 100;
  int peakTimeDropDelay = 10;
  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int  bouncingPeaksNumOfLeds = 3;
  int bouncingPeakDelay = 4;
  int bouncingPeakCounterInc  = 9;

#elif defined (led_strip_200)
  //settings for a 200 led strip

  int stripNumOfLeds = 200;
  uint32_t stripColor[101];
  int displayMiddleLed  = false;
  int splitStrip = true;
  int middleOffset = 0;
  int startupAnimationDelay  = 1;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int  dropDelay = 10;
  float dropFactor = .96;
  
  int peakTimeNoDropDelay  = 250;
  int peakTimeFirstDropDelay = 100;
  int peakTimeDropDelay = 30;
  float peakDropFactor = .99;
  int droppingPeakFade = false;
  
  int  bouncingPeaksNumOfLeds = 8;
  int bouncingPeakDelay = 4;
  int bouncingPeakCounterInc  = 9;

#elif defined (led_strip_144)
  //settings for a 200 led strip

  int stripNumOfLeds = 145;
  uint32_t stripColor[73];
  int displayMiddleLed  = true;
  int splitStrip = false;
  int middleOffset = 1;
  int startupAnimationDelay  = 1;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int  dropDelay = 10;
  float dropFactor = .85;
  
  int peakTimeNoDropDelay  = 250;
  int peakTimeFirstDropDelay = 100;
  int peakTimeDropDelay = 5;
  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int  bouncingPeaksNumOfLeds = 10;
  int bouncingPeakDelay = 2;
  int bouncingPeakCounterInc  = 10;
#endif

//
// setup other variables, user editable
//

//  basic settings
int minValue = 5;                                        // min  analog input value
int maxValue = 250;                                       //  max analog input value (0-1023 equals 0-5V)
int sensitivityValue = 255;                               //  0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
int  maxSensitivity = 2 * 255;                             // let the 'volume' go up  to 200%!
int ledBrightness = 30;                                   // 0 - 255,  initial value (value read from the potentiometer if useSensorValues = true)
int  sensorDeviationBrightness = 1;                        // eliminate fluctuating values
int  overflowDelay = 20;                                   // overflow hold time

//  peak settings
int displayPeaks = true;                                  // value  will be set by the switch if useSensorValues = true
int droppingPeak = true;                                  // display dropping peaks or not. note: displayPeaks  has to be true 
int bouncingPeaks = true;                                 //  display bouncing peaks or not. note: displayPeaks has to be true 

//
//  initialize other variables needed for the sketch
//

int numOfSegments  = stripNumOfLeds / 2;
int halfNumOfSegments = numOfSegments / 2; 
int stripMiddle  = stripNumOfLeds / 2;
int maxDisplaySegments = stripMiddle - 1;
float sensitivityFactor;

int  brightnessValue, prevBrightnessValue;
float ledFactor, ledFactor_div_numOfSegments;

int  leftValue = 0, rightValue = 0, maxReadValue = 0;
int leftAnalogValue = 0, rightAnalogValue  = 0;

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

uint32_t stripMiddleColor, stripOverflowColor,  stripHoldColor;

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;

//
// initialize the strip or rings
//

Adafruit_NeoPixel  strip = Adafruit_NeoPixel(stripNumOfLeds, stripPin, NEO_GRB + NEO_KHZ800);

//
//  setup
//

void setup() {
  #ifdef DEBUG
    Serial.begin(9600);
  #endif
  
  pinMode(showPeaksPin, INPUT);  

  strip.begin();
  
  setStripColors();
  startupAnimation();
  
  if (useSensorValues)  
    setInitialDisplayPeaks();
  else
    setSensitivityFactor();
}

//
//  main loop
//

void loop() {
  if (useSensorValues) 
    readSensorValues();
  
  readValues();
  drawValues();

  if (displayPeaks) {
    getPeaks();
    drawPeaks();
  }

  storePrevValues();
}

// 
// functions
//

void  setInitialDisplayPeaks() {
  readShowPeaksPin = digitalRead(showPeaksPin);
  if (readShowPeaksPin == HIGH)
    displayPeaks = false;
  else
    displayPeaks  = true;
  prevReadShowPeaksPin = readShowPeaksPin;
}

void readSensorValues()  {
  readShowPeaksPin = digitalRead(showPeaksPin);

  if (momentarySwitch)  {
    if (readShowPeaksPin == LOW && prevReadShowPeaksPin == HIGH) {
      if  (displayPeaks == true) {
        displayPeaks = false;
        clearLeftPeak();
        clearRightPeak();        
        if (momentarySwitch)
          while  (digitalRead(showPeaksPin) == LOW) {}
      }
      else {
        displayPeaks  = true;
      }
    }
  } 
  else {
    if (readShowPeaksPin == LOW  && prevReadShowPeaksPin == HIGH) 
      displayPeaks = true;
    else if (readShowPeaksPin  == HIGH && prevReadShowPeaksPin == LOW) {
      displayPeaks = false;
      clearLeftPeak();
      clearRightPeak();        
    }
  }
  prevReadShowPeaksPin = readShowPeaksPin;
  
  brightnessValue = analogRead(brightnessPin);
  brightnessValue = map(brightnessValue,  0, 1023, 0, 255);
  
  if (abs(brightnessValue - prevBrightnessValue) > sensorDeviationBrightness)  {
    ledBrightness = brightnessValue;
    setStripColors();
    prevBrightnessValue  = brightnessValue;
  }

  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() {
  leftAnalogValue = analogRead(leftPin);
  rightAnalogValue = analogRead(rightPin);

  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
    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 (leftValue  > maxDisplaySegments) {
      leftValue = maxDisplaySegments;
      drawOverflow();
  }
  
  if (rightValue > maxDisplaySegments) {
      rightValue = maxDisplaySegments;
      drawOverflow();
  }
}

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

  prevLeftValue  = leftValue;
  prevRightValue = rightValue;
}

void getPeaks() {
  if (leftValue > leftPeak) {
    leftPeak = leftValue;
    leftPeakTime =  0;
    leftFirstPeak = true;

    if (bouncingPeaks) {
      leftPeakBouncing  = true;
      leftPeakBounceCounter = 0;
      leftPeakBounceDelayCounter  = 0;
    }
  }
  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  * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - leftPeak));
          if (leftPeakBounce != prevLeftPeakBounce) {
            clearLeftBouncePeak();
          }
          prevLeftPeakBounce = leftPeakBounce;
        }
      }
    }
  }

  if (rightValue > rightPeak) {
    rightPeak = rightValue;
    rightPeakTime = 0;
    rightFirstPeak = true;

    if (bouncingPeaks)  {
      rightPeakBouncing = true;
      rightPeakBounceCounter = 0;
      rightPeakBounceDelayCounter  = 0;
    }
  }
  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  * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - rightPeak));
          if (rightPeakBounce != prevRightPeakBounce) {
            clearRightBouncePeak();
          }
          prevRightPeakBounce = rightPeakBounce;
        }
      }
    }
  }
}

void drawValues() {
  if (splitStrip) {
    for (i = middleOffset; i < leftValue; i++)
      strip.setPixelColor(i, stripColor[i]);
  
    for (i = prevLeftValue; i > leftValue; i--)
      strip.setPixelColor(i,  0);
  
    for (i = middleOffset; i < rightValue; i++)
      strip.setPixelColor(stripMiddle  + i, stripColor[i]);
  
    for (i = prevRightValue; i > rightValue; i--)
      strip.setPixelColor(stripMiddle + i, 0);
  }
  else {
    for (i  = middleOffset; i < leftValue; i++)
      strip.setPixelColor(stripMiddle + i,  stripColor[i]);
  
    for (i = prevLeftValue; i > leftValue; i--)
      strip.setPixelColor(stripMiddle  + i, 0);
  
    for (i = middleOffset; i < rightValue; i++)
      strip.setPixelColor(stripMiddle  - i, stripColor[i]);
  
    for (i = prevRightValue; i > rightValue; i--)
      strip.setPixelColor(stripMiddle - i, 0);
  }

  if (displayMiddleLed)  strip.setPixelColor(stripMiddle, stripMiddleColor);
  strip.show();
}

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

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

    if (splitStrip)
      strip.setPixelColor(stripMiddle  + rightPeak + prevRightPeakBounce, stripHoldColor);
    else 
      strip.setPixelColor(stripMiddle  - (rightPeak + prevRightPeakBounce), stripHoldColor);
  }

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

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

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

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

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

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

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

void clearRightBouncePeak()  {
  if (splitStrip)
    strip.setPixelColor((stripMiddle + rightPeak + prevRightPeakBounce),  0);
  else
    strip.setPixelColor(stripMiddle - (rightPeak + prevRightPeakBounce),  0);
}

void drawOverflow() {
  for (i = 0; i <= numOfSegments; i++)  {
    strip.setPixelColor(stripMiddle + i, stripOverflowColor);
    strip.setPixelColor(stripMiddle  - i, stripOverflowColor);
  }
  strip.show();
  delay(overflowDelay);

  for (i = 0; i <= numOfSegments; i++) {
    strip.setPixelColor(stripMiddle  + i, 0);
    strip.setPixelColor(stripMiddle - i, 0);
  }
  strip.show();
}

void  setStripColors() {
  int orangeLimit;
  ledFactor = (float)ledBrightness /  255;

  float orangeFactor = orangeLimitAmount / halfNumOfSegments;
  ledFactor_div_numOfSegments  = ledFactor / numOfSegments;
  
  stripOverflowColor = strip.Color(min(255,  255 * ledFactor * 1.5), 0, 0);
  stripMiddleColor = strip.Color(0, 0, 255 * ledFactor);

  stripColor[0] = strip.Color(0, 255 * ledFactor, 0);
  for (i = 1; i <= numOfSegments;  i++) {
    if (i <= halfNumOfSegments)
      orangeLimit = (i * orangeFactor);
    else
      orangeLimit = ((numOfSegments - i) * orangeFactor);

    stripColor[i]  = strip.Color((255 * i * ledFactor_div_numOfSegments), ((255 - orangeLimit) * (numOfSegments  - i) * ledFactor_div_numOfSegments), 0); 
  }

  stripHoldColor = stripColor[numOfSegments];
}

void  startupAnimation() {  
  for (j = 0; j < 2; j++) {
    for (i = 0; i <= numOfSegments;  i++) {
      strip.setPixelColor(stripMiddle - i, stripColor[i]);
      strip.setPixelColor(stripMiddle  + i, stripColor[i]);
      strip.show();
      delay(startupAnimationDelay);
    }
    
    for (i = 0; i <= numOfSegments; i++) {
      strip.setPixelColor(stripMiddle  + i, 0);
      strip.setPixelColor(stripMiddle - i, 0);
      strip.show();
      delay(startupAnimationDelay);
    }
  }
}

Code

arduino

1/*
2**********************************************************************
3*
4  Stereo VU Meter for 1 or 2 LED rings or strips build by ericBcreator
5* Designed
6  to be used with an Arduino UNO, Nano or compatible device.
7**********************************************************************
8*
9  Last updated 20171105 by ericBcreator
10*
11* This code is free for personal use,
12  not for commercial purposes.
13* Please leave this header intact.
14*
15* contact:
16  ericBcreator@gmail.com
17**********************************************************************
18*/
19
20//#define
21  DEBUG                                             // for debugging
22
23//
24//
25  include the NeoPixel library:
26//
27
28#include <Adafruit_NeoPixel.h>
29
30//
31//
32  uncomment the definition for the connected strip or ring(s)
33//
34
35//#define
36  led_ring_60
37//#define led_strip_60
38//#define led_strip_30
39//#define led_2_rings_24
40#define
41  led_2_rings_30
42//#define led_strip_200
43//#define led_strip_144
44
45//
46//
47  important setting: using potentiometer sensor values or not
48// This setting has
49  to be set right or the script will not work correctly:
50// - set this to true
51  if using potentiometers
52// - set this to false if not using potentiometers
53//
54
55const
56  int useSensorValues = true;                         
57
58//
59// setup pins
60//
61
62int
63  leftPin = A0, rightPin = A1;                          // left audio in on analog
64  0, right on analog 1
65int brightnessPin = A4, sensitivityPin = A5;              //
66  potentiometers for brightness and sensitivity on analog 4 and 5
67int stripPin
68  = 6;                                         // DIN of leds on digital pin 6
69int
70  showPeaksPin = 7;                                     // switch to toggle peaks
71  on or off on digital pin 7
72int momentarySwitch = false;                              //
73  set false for an on/off toggle switch
74
75//
76// setup variables for the number
77  of leds and led strip or 2 rings
78//
79
80#if defined (led_ring_60)
81  //settings
82  for a 60 led ring
83
84  int stripNumOfLeds = 32;                                  //
85  the total number of leds         60   idi
86  uint32_t stripColor[17];                                  //
87  half of the number of leds + 1   32 idi
88  int displayMiddleLed = false;                             //
89  display the middle led (blue). set to true for one strip, false for two strips or
90  rings
91  int splitStrip = true;                                    // set to true
92  when using 2 strips or rings, false for one strip
93  int middleOffset = 0;                                     //
94  offset for the middle led when using one strip
95  int startupAnimationDelay =
96  6;                            // delay for the startup animation
97  int orangeLimitAmount
98  = 0;                                // limit the amount of green of the middle LEDs
99  to make them more orange
100  int swapLeftRight = false;                                //
101  swap the left and right input values or not
102  
103  int dropDelay = 4;                                        //
104  hold time before dropping the leds
105  float dropFactor = .92;                                   //
106  value for dropping the leds
107  
108  int peakTimeNoDropDelay = 250;                            //
109  peak hold time when not dropping the peaks (set droppingPeak true or false)
110
111  int peakTimeFirstDropDelay = 130;                         // peak hold time when
112  dropping the first peak
113  int peakTimeDropDelay = 7;                                //
114  peak hold time when dropping the rest of the peaks
115  float peakDropFactor = .93;
116                               // value for dropping the peaks
117  int droppingPeakFade
118  = false;                             // display the dropping peak fading to black
119  or not
120  
121  int bouncingPeaksNumOfLeds = 6;                           // how
122  many leds to bounce up (max)
123  int bouncingPeakDelay = 4;                                //
124  delay between peak bounce updates
125  int bouncingPeakCounterInc = 10;                          //
126  increase counter for each bounce update. note: it uses a 0-180 sin function for
127  the bouncing
128
129#elif defined (led_strip_60)
130  //settings for a 60 led ring
131
132
133  int stripNumOfLeds = 60;                                  // the total number
134  of leds
135  uint32_t stripColor[31];                                  // half of
136  the number of leds + 1
137  int displayMiddleLed = true;                              //
138  display the middle led (blue). set to true for one strip, false for two strips or
139  rings
140  int splitStrip = false;                                   // set to true
141  when using 2 strips or rings, false for one strip
142  int middleOffset = 1;                                     //
143  offset for the middle led when using one strip
144  int startupAnimationDelay =
145  6;                            // delay for the startup animation
146  int orangeLimitAmount
147  = 0;                                // limit the amount of green of the middle LEDs
148  to make them more orange
149  int swapLeftRight = false;                                //
150  swap the left and right input values or not
151  
152  int dropDelay = 4;                                        //
153  hold time before dropping the leds
154  float dropFactor = .92;                                   //
155  value for dropping the leds
156  
157  int peakTimeNoDropDelay = 250;                            //
158  peak hold time when not dropping the peaks (set droppingPeak true or false)
159
160  int peakTimeFirstDropDelay = 130;                         // peak hold time when
161  dropping the first peak
162  int peakTimeDropDelay = 7;                                //
163  peak hold time when dropping the rest of the peaks
164  float peakDropFactor = .93;
165                               // value for dropping the peaks
166  int droppingPeakFade
167  = false;                             // display the dropping peak fading to black
168  or not
169  
170  int bouncingPeaksNumOfLeds = 6;                           // how
171  many leds to bounce up (max)
172  int bouncingPeakDelay = 4;                                //
173  delay between peak bounce updates
174  int bouncingPeakCounterInc = 10;                          //
175  increase counter for each bounce update. note: it uses a 0-180 sin function for
176  the bouncing
177
178#elif defined (led_strip_30)
179  //settings for a 30 led strip
180
181
182  int stripNumOfLeds = 30;                                  // the total number
183  of leds
184  uint32_t stripColor[16];                                  // half of
185  the number of leds + 1
186  int displayMiddleLed = true;                              //
187  display the middle led (blue). set to true for one strip, false for two strips or
188  rings
189  int splitStrip = false;                                   // set to true
190  when using 2 strips or rings, false for one strip
191  int middleOffset = 1;                                     //
192  offset for the middle led when using one strip
193  int startupAnimationDelay =
194  10;                           // delay for the startup animation
195  int orangeLimitAmount
196  = 0;                                // limit the amount of green of the middle LEDs
197  to make them more orange
198  int swapLeftRight = false;                                //
199  swap the left and right input values or not
200  
201  int dropDelay = 10;                                       //
202  hold time before dropping the leds
203  float dropFactor = .9;                                    //
204  value for dropping the leds
205  
206  int peakTimeNoDropDelay = 250;                            //
207  peak hold time when not dropping the peaks (set droppingPeak true or false)
208
209  int peakTimeFirstDropDelay = 150;                         // peak hold time when
210  dropping the first peak
211  int peakTimeDropDelay = 15;                               //
212  peak hold time when dropping the rest of the peaks
213  float peakDropFactor = .94;
214                               // value for dropping the peaks
215  int droppingPeakFade
216  = false;                             // display the dropping peak fading to black
217  or not
218  
219  int bouncingPeaksNumOfLeds = 3;                           // how
220  many leds to bounce up (max)
221  int bouncingPeakDelay = 4;                                //
222  delay between peak bounce updates
223  int bouncingPeakCounterInc = 9;                           //
224  increase counter for each bounce update. note: it uses a 0-180 sin function for
225  the bouncing
226
227#elif defined (led_2_rings_24)
228  //settings for 2 24 led
229  rings
230
231  int stripNumOfLeds = 48;
232  uint32_t stripColor[25];
233  int displayMiddleLed
234  = false;
235  int splitStrip = true;
236  int middleOffset = 0;
237  int startupAnimationDelay
238  = 5;
239  int orangeLimitAmount = 0;
240  int swapLeftRight = false;
241  
242  int
243  dropDelay = 2;
244  float dropFactor = .96;
245  
246  int peakTimeNoDropDelay =
247  250;
248  int peakTimeFirstDropDelay = 100;
249  int peakTimeDropDelay = 10;
250
251  float peakDropFactor = .94;
252  int droppingPeakFade = false;
253  
254  int
255  bouncingPeaksNumOfLeds = 3;
256  int bouncingPeakDelay = 4;
257  int bouncingPeakCounterInc
258  = 9;
259
260#elif defined(led_2_rings_30)
261  //settings for 2 30 led rings
262
263
264  int stripNumOfLeds = 60;
265  uint32_t stripColor[31];
266  int displayMiddleLed
267  = false;
268  int splitStrip = true;
269  int middleOffset = 0;
270  int startupAnimationDelay
271  = 5;
272  int orangeLimitAmount = 0;
273  int swapLeftRight = false;
274  
275  int
276  dropDelay = 2;
277  float dropFactor = .96;
278  
279  int peakTimeNoDropDelay =
280  250;
281  int peakTimeFirstDropDelay = 100;
282  int peakTimeDropDelay = 10;
283
284  float peakDropFactor = .94;
285  int droppingPeakFade = false;
286  
287  int
288  bouncingPeaksNumOfLeds = 3;
289  int bouncingPeakDelay = 4;
290  int bouncingPeakCounterInc
291  = 9;
292
293#elif defined (led_strip_200)
294  //settings for a 200 led strip
295
296
297  int stripNumOfLeds = 200;
298  uint32_t stripColor[101];
299  int displayMiddleLed
300  = false;
301  int splitStrip = true;
302  int middleOffset = 0;
303  int startupAnimationDelay
304  = 1;
305  int orangeLimitAmount = 0;
306  int swapLeftRight = false;
307  
308  int
309  dropDelay = 10;
310  float dropFactor = .96;
311  
312  int peakTimeNoDropDelay
313  = 250;
314  int peakTimeFirstDropDelay = 100;
315  int peakTimeDropDelay = 30;
316
317  float peakDropFactor = .99;
318  int droppingPeakFade = false;
319  
320  int
321  bouncingPeaksNumOfLeds = 8;
322  int bouncingPeakDelay = 4;
323  int bouncingPeakCounterInc
324  = 9;
325
326#elif defined (led_strip_144)
327  //settings for a 200 led strip
328
329
330  int stripNumOfLeds = 145;
331  uint32_t stripColor[73];
332  int displayMiddleLed
333  = true;
334  int splitStrip = false;
335  int middleOffset = 1;
336  int startupAnimationDelay
337  = 1;
338  int orangeLimitAmount = 0;
339  int swapLeftRight = false;
340  
341  int
342  dropDelay = 10;
343  float dropFactor = .85;
344  
345  int peakTimeNoDropDelay
346  = 250;
347  int peakTimeFirstDropDelay = 100;
348  int peakTimeDropDelay = 5;
349
350  float peakDropFactor = .94;
351  int droppingPeakFade = false;
352  
353  int
354  bouncingPeaksNumOfLeds = 10;
355  int bouncingPeakDelay = 2;
356  int bouncingPeakCounterInc
357  = 10;
358#endif
359
360//
361// setup other variables, user editable
362//
363
364//
365  basic settings
366int minValue = 5;                                        // min
367  analog input value
368int maxValue = 250;                                       //
369  max analog input value (0-1023 equals 0-5V)
370int sensitivityValue = 255;                               //
371  0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
372int
373  maxSensitivity = 2 * 255;                             // let the 'volume' go up
374  to 200%!
375int ledBrightness = 30;                                   // 0 - 255,
376  initial value (value read from the potentiometer if useSensorValues = true)
377int
378  sensorDeviationBrightness = 1;                        // eliminate fluctuating values
379int
380  overflowDelay = 20;                                   // overflow hold time
381
382//
383  peak settings
384int displayPeaks = true;                                  // value
385  will be set by the switch if useSensorValues = true
386int droppingPeak = true;
387                                  // display dropping peaks or not. note: displayPeaks
388  has to be true 
389int bouncingPeaks = true;                                 //
390  display bouncing peaks or not. note: displayPeaks has to be true 
391
392//
393//
394  initialize other variables needed for the sketch
395//
396
397int numOfSegments
398  = stripNumOfLeds / 2;
399int halfNumOfSegments = numOfSegments / 2; 
400int stripMiddle
401  = stripNumOfLeds / 2;
402int maxDisplaySegments = stripMiddle - 1;
403float sensitivityFactor;
404
405int
406  brightnessValue, prevBrightnessValue;
407float ledFactor, ledFactor_div_numOfSegments;
408
409int
410  leftValue = 0, rightValue = 0, maxReadValue = 0;
411int leftAnalogValue = 0, rightAnalogValue
412  = 0;
413
414int prevLeftValue = 0, prevRightValue = 0;
415int prevLeftAnalogValue
416  = 0, prevRightAnalogValue = 0;
417
418int i, j;
419int dropLeft, dropRight;
420int
421  leftDropTime, rightDropTime;
422
423int leftPeak = 0, rightPeak = 0;
424int leftPeakTime
425  = 0, rightPeakTime = 0;
426int leftFirstPeak = true, rightFirstPeak = true;
427int
428  readShowPeaksPin, prevReadShowPeaksPin;
429
430uint32_t stripMiddleColor, stripOverflowColor,
431  stripHoldColor;
432
433int leftPeakBouncing = false, rightPeakBouncing = false;
434int
435  leftPeakBounce = 0, rightPeakBounce = 0;
436int prevLeftPeakBounce = 0, prevRightPeakBounce
437  = 0;
438int leftPeakBounceCounter = 0, rightPeakBounceCounter = 0;
439int leftPeakBounceDelayCounter
440  = 0, rightPeakBounceDelayCounter = 0;
441
442//
443// initialize the strip or rings
444//
445
446Adafruit_NeoPixel
447  strip = Adafruit_NeoPixel(stripNumOfLeds, stripPin, NEO_GRB + NEO_KHZ800);
448
449//
450//
451  setup
452//
453
454void setup() {
455  #ifdef DEBUG
456    Serial.begin(9600);
457
458  #endif
459  
460  pinMode(showPeaksPin, INPUT);  
461
462  strip.begin();
463
464  
465  setStripColors();
466  startupAnimation();
467  
468  if (useSensorValues)
469  
470    setInitialDisplayPeaks();
471  else
472    setSensitivityFactor();
473}
474
475//
476//
477  main loop
478//
479
480void loop() {
481  if (useSensorValues) 
482    readSensorValues();
483
484  
485  readValues();
486  drawValues();
487
488  if (displayPeaks) {
489    getPeaks();
490
491    drawPeaks();
492  }
493
494  storePrevValues();
495}
496
497// 
498// functions
499//
500
501void
502  setInitialDisplayPeaks() {
503  readShowPeaksPin = digitalRead(showPeaksPin);
504
505  if (readShowPeaksPin == HIGH)
506    displayPeaks = false;
507  else
508    displayPeaks
509  = true;
510  prevReadShowPeaksPin = readShowPeaksPin;
511}
512
513void readSensorValues()
514  {
515  readShowPeaksPin = digitalRead(showPeaksPin);
516
517  if (momentarySwitch)
518  {
519    if (readShowPeaksPin == LOW && prevReadShowPeaksPin == HIGH) {
520      if
521  (displayPeaks == true) {
522        displayPeaks = false;
523        clearLeftPeak();
524
525        clearRightPeak();        
526        if (momentarySwitch)
527          while
528  (digitalRead(showPeaksPin) == LOW) {}
529      }
530      else {
531        displayPeaks
532  = true;
533      }
534    }
535  } 
536  else {
537    if (readShowPeaksPin == LOW
538  && prevReadShowPeaksPin == HIGH) 
539      displayPeaks = true;
540    else if (readShowPeaksPin
541  == HIGH && prevReadShowPeaksPin == LOW) {
542      displayPeaks = false;
543      clearLeftPeak();
544
545      clearRightPeak();        
546    }
547  }
548  prevReadShowPeaksPin = readShowPeaksPin;
549
550  
551  brightnessValue = analogRead(brightnessPin);
552  brightnessValue = map(brightnessValue,
553  0, 1023, 0, 255);
554  
555  if (abs(brightnessValue - prevBrightnessValue) > sensorDeviationBrightness)
556  {
557    ledBrightness = brightnessValue;
558    setStripColors();
559    prevBrightnessValue
560  = brightnessValue;
561  }
562
563  sensitivityValue = analogRead(sensitivityPin);
564
565  sensitivityValue = map(sensitivityValue, 0, 1023, 0, 255);
566  setSensitivityFactor();
567}
568
569void
570  setSensitivityFactor() {
571  //sensitivityValue_div_numOfSegments = sensitivityValue
572  / numOfSegments;
573  sensitivityFactor = ((float) sensitivityValue / 255 * (float)
574  maxSensitivity / 255);
575}
576
577void readValues() {
578  leftAnalogValue = analogRead(leftPin);
579
580  rightAnalogValue = analogRead(rightPin);
581
582  if (swapLeftRight) {
583    int
584  tempValue = leftAnalogValue;
585    leftAnalogValue = rightAnalogValue;
586    rightAnalogValue
587  = tempValue;
588  }
589
590  if (leftAnalogValue < prevLeftAnalogValue) {
591    leftDropTime++;
592
593    if (leftDropTime > dropDelay) {
594      leftAnalogValue = prevLeftAnalogValue
595  * dropFactor;
596      leftDropTime = 0;
597    }
598    else
599      leftAnalogValue
600  = prevLeftAnalogValue;
601  }
602   
603  if (rightAnalogValue < prevRightAnalogValue)
604  {
605    rightDropTime++;
606    if (rightDropTime > dropDelay) {
607      rightAnalogValue
608  = prevRightAnalogValue * dropFactor;
609      rightDropTime = 0;
610    }
611    else
612
613      rightAnalogValue = prevRightAnalogValue;
614  }
615
616  #ifdef DEBUG
617
618    Serial.print(leftAnalogValue);
619    Serial.print(" ");
620    Serial.println(rightAnalogValue);
621
622  #endif  
623
624  // map values  
625  leftValue = map(leftAnalogValue * sensitivityFactor,
626  minValue, maxValue, 0, maxDisplaySegments);
627  rightValue = map(rightAnalogValue
628  * sensitivityFactor, minValue, maxValue, 0, maxDisplaySegments);
629
630  if (leftValue
631  > maxDisplaySegments) {
632      leftValue = maxDisplaySegments;
633      drawOverflow();
634
635  }
636  
637  if (rightValue > maxDisplaySegments) {
638      rightValue = maxDisplaySegments;
639
640      drawOverflow();
641  }
642}
643
644void storePrevValues() {
645  prevLeftAnalogValue
646  = leftAnalogValue;
647  prevRightAnalogValue = rightAnalogValue;
648
649  prevLeftValue
650  = leftValue;
651  prevRightValue = rightValue;
652}
653
654void getPeaks() {
655
656  if (leftValue > leftPeak) {
657    leftPeak = leftValue;
658    leftPeakTime =
659  0;
660    leftFirstPeak = true;
661
662    if (bouncingPeaks) {
663      leftPeakBouncing
664  = true;
665      leftPeakBounceCounter = 0;
666      leftPeakBounceDelayCounter
667  = 0;
668    }
669  }
670  else {
671    leftPeakTime++;
672    if (droppingPeak)
673  {
674      if (leftFirstPeak) {
675        if (leftPeakTime > peakTimeFirstDropDelay)
676  {
677          clearLeftPeak();
678          leftFirstPeak = false;
679        }
680
681      }
682      else {
683        if (leftPeakTime > peakTimeDropDelay) {
684          clearLeftPeak();
685
686        }
687      }
688    }
689    else {
690      if (leftPeakTime > peakTimeNoDropDelay)
691  {
692        clearLeftPeak();
693      }
694    }
695  }
696
697  if (leftPeakBouncing)
698  {
699    if (leftFirstPeak) {
700      leftPeakBounceDelayCounter++;
701      if
702  (leftPeakBounceDelayCounter >= bouncingPeakDelay) {
703        leftPeakBounceDelayCounter
704  = 0;
705        leftPeakBounceCounter += bouncingPeakCounterInc;
706  
707        if
708  (leftPeakBounceCounter >= 180) {
709          clearLeftBouncePeak();
710          clearLeftBounce();
711
712        }
713        else {        
714          leftPeakBounce = min((sin(leftPeakBounceCounter
715  * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - leftPeak));
716
717          if (leftPeakBounce != prevLeftPeakBounce) {
718            clearLeftBouncePeak();
719
720          }
721          prevLeftPeakBounce = leftPeakBounce;
722        }
723      }
724
725    }
726  }
727
728  if (rightValue > rightPeak) {
729    rightPeak = rightValue;
730
731    rightPeakTime = 0;
732    rightFirstPeak = true;
733
734    if (bouncingPeaks)
735  {
736      rightPeakBouncing = true;
737      rightPeakBounceCounter = 0;
738      rightPeakBounceDelayCounter
739  = 0;
740    }
741  }
742  else {
743    rightPeakTime++;
744    if (droppingPeak)
745  {
746      if (rightFirstPeak) {
747        if (rightPeakTime > peakTimeFirstDropDelay)
748  {
749          clearRightPeak();
750          rightFirstPeak = false;
751        }
752
753      }
754      else {
755        if (rightPeakTime > peakTimeDropDelay)
756          clearRightPeak();
757
758      }
759    }
760    else {
761      if (rightPeakTime > peakTimeNoDropDelay)
762
763        clearRightPeak();
764    }
765  }
766
767  if (rightPeakBouncing) {
768
769    if (rightFirstPeak) {
770      rightPeakBounceDelayCounter++;
771      if (rightPeakBounceDelayCounter
772  >= bouncingPeakDelay) {
773        rightPeakBounceDelayCounter = 0;
774        rightPeakBounceCounter
775  += bouncingPeakCounterInc;
776  
777        if (rightPeakBounceCounter >= 180) {
778
779          clearRightBouncePeak();
780          clearRightBounce();
781        }
782
783        else {        
784          rightPeakBounce = min((sin(rightPeakBounceCounter
785  * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - rightPeak));
786
787          if (rightPeakBounce != prevRightPeakBounce) {
788            clearRightBouncePeak();
789
790          }
791          prevRightPeakBounce = rightPeakBounce;
792        }
793
794      }
795    }
796  }
797}
798
799void drawValues() {
800  if (splitStrip) {
801
802    for (i = middleOffset; i < leftValue; i++)
803      strip.setPixelColor(i, stripColor[i]);
804
805  
806    for (i = prevLeftValue; i > leftValue; i--)
807      strip.setPixelColor(i,
808  0);
809  
810    for (i = middleOffset; i < rightValue; i++)
811      strip.setPixelColor(stripMiddle
812  + i, stripColor[i]);
813  
814    for (i = prevRightValue; i > rightValue; i--)
815
816      strip.setPixelColor(stripMiddle + i, 0);
817  }
818  else {
819    for (i
820  = middleOffset; i < leftValue; i++)
821      strip.setPixelColor(stripMiddle + i,
822  stripColor[i]);
823  
824    for (i = prevLeftValue; i > leftValue; i--)
825      strip.setPixelColor(stripMiddle
826  + i, 0);
827  
828    for (i = middleOffset; i < rightValue; i++)
829      strip.setPixelColor(stripMiddle
830  - i, stripColor[i]);
831  
832    for (i = prevRightValue; i > rightValue; i--)
833
834      strip.setPixelColor(stripMiddle - i, 0);
835  }
836
837  if (displayMiddleLed)
838  strip.setPixelColor(stripMiddle, stripMiddleColor);
839  strip.show();
840}
841
842void
843  drawPeaks() {
844  if (leftPeak > 0) {
845    if (droppingPeakFade && leftPeakBouncing
846  == false)
847      stripHoldColor = strip.Color(max(1, (255 * leftPeak * ledFactor_div_numOfSegments)),
848  0, 0);
849    else
850      stripHoldColor = stripColor[numOfSegments];
851
852
853    if (splitStrip)
854      strip.setPixelColor((leftPeak + leftPeakBounce), stripHoldColor);
855
856    else
857      strip.setPixelColor(stripMiddle + (leftPeak + leftPeakBounce),
858  stripHoldColor);
859  } 
860  
861  if (rightPeak > 0) {
862    if (droppingPeakFade
863  && rightPeakBouncing == false)
864      stripHoldColor = strip.Color(max(1, (255
865  * rightPeak * ledFactor_div_numOfSegments)), 0, 0);    
866    else
867      stripHoldColor
868  = stripColor[numOfSegments];
869
870    if (splitStrip)
871      strip.setPixelColor(stripMiddle
872  + rightPeak + prevRightPeakBounce, stripHoldColor);
873    else 
874      strip.setPixelColor(stripMiddle
875  - (rightPeak + prevRightPeakBounce), stripHoldColor);
876  }
877
878  if (leftPeak
879  > 0 || rightPeak > 0)
880    strip.show();    
881}
882
883void clearLeftPeak()
884  {
885  if (splitStrip)
886    strip.setPixelColor((leftPeak + prevLeftPeakBounce),
887  0);
888  else
889    strip.setPixelColor(stripMiddle + (leftPeak + prevLeftPeakBounce),
890  0);
891
892  if (droppingPeak)
893    leftPeak = leftPeak * peakDropFactor;
894
895  else
896    leftPeak = 0;
897  leftPeakTime = 0;
898}
899
900void clearLeftBounce()
901  {
902  leftPeakBouncing = false;
903  leftPeakBounceCounter = 0;
904  leftPeakBounce
905  = 0;
906  prevLeftPeakBounce = 0;
907}
908
909void clearLeftBouncePeak() {
910  if
911  (splitStrip)
912    strip.setPixelColor((leftPeak + prevLeftPeakBounce), 0);
913
914  else
915    strip.setPixelColor(stripMiddle + (leftPeak + prevLeftPeakBounce),
916  0);
917}
918
919void clearRightPeak() {
920  if (splitStrip)
921    strip.setPixelColor(stripMiddle
922  + rightPeak + prevRightPeakBounce, 0);
923  else 
924    strip.setPixelColor(stripMiddle
925  - (rightPeak + prevRightPeakBounce), 0);
926  
927  if (droppingPeak)
928    rightPeak
929  = rightPeak * peakDropFactor;
930  else
931    rightPeak = 0;
932  rightPeakTime
933  = 0;
934}
935
936void clearRightBounce() {
937  rightPeakBouncing = false;
938  rightPeakBounceCounter
939  = 0;
940  rightPeakBounce = 0;
941  prevRightPeakBounce = 0;
942}
943
944void clearRightBouncePeak()
945  {
946  if (splitStrip)
947    strip.setPixelColor((stripMiddle + rightPeak + prevRightPeakBounce),
948  0);
949  else
950    strip.setPixelColor(stripMiddle - (rightPeak + prevRightPeakBounce),
951  0);
952}
953
954void drawOverflow() {
955  for (i = 0; i <= numOfSegments; i++)
956  {
957    strip.setPixelColor(stripMiddle + i, stripOverflowColor);
958    strip.setPixelColor(stripMiddle
959  - i, stripOverflowColor);
960  }
961  strip.show();
962  delay(overflowDelay);
963
964
965  for (i = 0; i <= numOfSegments; i++) {
966    strip.setPixelColor(stripMiddle
967  + i, 0);
968    strip.setPixelColor(stripMiddle - i, 0);
969  }
970  strip.show();
971}
972
973void
974  setStripColors() {
975  int orangeLimit;
976  ledFactor = (float)ledBrightness /
977  255;
978
979  float orangeFactor = orangeLimitAmount / halfNumOfSegments;
980  ledFactor_div_numOfSegments
981  = ledFactor / numOfSegments;
982  
983  stripOverflowColor = strip.Color(min(255,
984  255 * ledFactor * 1.5), 0, 0);
985  stripMiddleColor = strip.Color(0, 0, 255 * ledFactor);
986
987
988  stripColor[0] = strip.Color(0, 255 * ledFactor, 0);
989  for (i = 1; i <= numOfSegments;
990  i++) {
991    if (i <= halfNumOfSegments)
992      orangeLimit = (i * orangeFactor);
993
994    else
995      orangeLimit = ((numOfSegments - i) * orangeFactor);
996
997    stripColor[i]
998  = strip.Color((255 * i * ledFactor_div_numOfSegments), ((255 - orangeLimit) * (numOfSegments
999  - i) * ledFactor_div_numOfSegments), 0); 
1000  }
1001
1002  stripHoldColor = stripColor[numOfSegments];
1003}
1004
1005void
1006  startupAnimation() {  
1007  for (j = 0; j < 2; j++) {
1008    for (i = 0; i <= numOfSegments;
1009  i++) {
1010      strip.setPixelColor(stripMiddle - i, stripColor[i]);
1011      strip.setPixelColor(stripMiddle
1012  + i, stripColor[i]);
1013      strip.show();
1014      delay(startupAnimationDelay);
1015
1016    }
1017    
1018    for (i = 0; i <= numOfSegments; i++) {
1019      strip.setPixelColor(stripMiddle
1020  + i, 0);
1021      strip.setPixelColor(stripMiddle - i, 0);
1022      strip.show();
1023
1024      delay(startupAnimationDelay);
1025    }
1026  }
1027}
1028

/*
**********************************************************************
*
  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.
**********************************************************************
*
  Last updated 20171105 by ericBcreator
*
* This code is free for personal use,
  not for commercial purposes.
* Please leave this header intact.
*
* contact:
  ericBcreator@gmail.com
**********************************************************************
*/

//#define
  DEBUG                                             // for debugging

//
//
  include the NeoPixel library:
//

#include <Adafruit_NeoPixel.h>

//
//
  uncomment the definition for the connected strip or ring(s)
//

//#define
  led_ring_60
//#define led_strip_60
//#define led_strip_30
//#define led_2_rings_24
#define
  led_2_rings_30
//#define led_strip_200
//#define led_strip_144

//
//
  important setting: using potentiometer sensor values or not
// This setting has
  to be set right or the script will not work correctly:
// - set this to true
  if using potentiometers
// - set this to false if not using potentiometers
//

const
  int useSensorValues = true;                         

//
// 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 stripPin
  = 6;                                         // DIN of leds on digital pin 6
int
  showPeaksPin = 7;                                     // switch to toggle peaks
  on or off on digital pin 7
int momentarySwitch = false;                              //
  set false for an on/off toggle switch

//
// setup variables for the number
  of leds and led strip or 2 rings
//

#if defined (led_ring_60)
  //settings
  for a 60 led ring

  int stripNumOfLeds = 32;                                  //
  the total number of leds         60   idi
  uint32_t stripColor[17];                                  //
  half of the number of leds + 1   32 idi
  int displayMiddleLed = false;                             //
  display the middle led (blue). set to true for one strip, false for two strips or
  rings
  int splitStrip = true;                                    // set to true
  when using 2 strips or rings, false for one strip
  int middleOffset = 0;                                     //
  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 = 4;                                        //
  hold time before dropping the leds
  float dropFactor = .92;                                   //
  value for dropping the leds
  
  int peakTimeNoDropDelay = 250;                            //
  peak hold time when not dropping the peaks (set droppingPeak true or false)

  int peakTimeFirstDropDelay = 130;                         // peak hold time when
  dropping the first peak
  int peakTimeDropDelay = 7;                                //
  peak hold time when dropping the rest of the peaks
  float peakDropFactor = .93;
                               // 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 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_strip_60)
  //settings for a 60 led ring


  int stripNumOfLeds = 60;                                  // the total number
  of leds
  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 = 4;                                        //
  hold time before dropping the leds
  float dropFactor = .92;                                   //
  value for dropping the leds
  
  int peakTimeNoDropDelay = 250;                            //
  peak hold time when not dropping the peaks (set droppingPeak true or false)

  int peakTimeFirstDropDelay = 130;                         // peak hold time when
  dropping the first peak
  int peakTimeDropDelay = 7;                                //
  peak hold time when dropping the rest of the peaks
  float peakDropFactor = .93;
                               // 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 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_strip_30)
  //settings for a 30 led strip


  int stripNumOfLeds = 30;                                  // the total number
  of leds
  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 = 3;                           // how
  many leds to bounce up (max)
  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_rings_24)
  //settings for 2 24 led
  rings

  int stripNumOfLeds = 48;
  uint32_t stripColor[25];
  int displayMiddleLed
  = false;
  int splitStrip = true;
  int middleOffset = 0;
  int startupAnimationDelay
  = 5;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int
  dropDelay = 2;
  float dropFactor = .96;
  
  int peakTimeNoDropDelay =
  250;
  int peakTimeFirstDropDelay = 100;
  int peakTimeDropDelay = 10;

  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int
  bouncingPeaksNumOfLeds = 3;
  int bouncingPeakDelay = 4;
  int bouncingPeakCounterInc
  = 9;

#elif defined(led_2_rings_30)
  //settings for 2 30 led rings


  int stripNumOfLeds = 60;
  uint32_t stripColor[31];
  int displayMiddleLed
  = false;
  int splitStrip = true;
  int middleOffset = 0;
  int startupAnimationDelay
  = 5;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int
  dropDelay = 2;
  float dropFactor = .96;
  
  int peakTimeNoDropDelay =
  250;
  int peakTimeFirstDropDelay = 100;
  int peakTimeDropDelay = 10;

  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int
  bouncingPeaksNumOfLeds = 3;
  int bouncingPeakDelay = 4;
  int bouncingPeakCounterInc
  = 9;

#elif defined (led_strip_200)
  //settings for a 200 led strip


  int stripNumOfLeds = 200;
  uint32_t stripColor[101];
  int displayMiddleLed
  = false;
  int splitStrip = true;
  int middleOffset = 0;
  int startupAnimationDelay
  = 1;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int
  dropDelay = 10;
  float dropFactor = .96;
  
  int peakTimeNoDropDelay
  = 250;
  int peakTimeFirstDropDelay = 100;
  int peakTimeDropDelay = 30;

  float peakDropFactor = .99;
  int droppingPeakFade = false;
  
  int
  bouncingPeaksNumOfLeds = 8;
  int bouncingPeakDelay = 4;
  int bouncingPeakCounterInc
  = 9;

#elif defined (led_strip_144)
  //settings for a 200 led strip


  int stripNumOfLeds = 145;
  uint32_t stripColor[73];
  int displayMiddleLed
  = true;
  int splitStrip = false;
  int middleOffset = 1;
  int startupAnimationDelay
  = 1;
  int orangeLimitAmount = 0;
  int swapLeftRight = false;
  
  int
  dropDelay = 10;
  float dropFactor = .85;
  
  int peakTimeNoDropDelay
  = 250;
  int peakTimeFirstDropDelay = 100;
  int peakTimeDropDelay = 5;

  float peakDropFactor = .94;
  int droppingPeakFade = false;
  
  int
  bouncingPeaksNumOfLeds = 10;
  int bouncingPeakDelay = 2;
  int bouncingPeakCounterInc
  = 10;
#endif

//
// setup other variables, user editable
//

//
  basic settings
int minValue = 5;                                        // min
  analog input value
int maxValue = 250;                                       //
  max analog input value (0-1023 equals 0-5V)
int sensitivityValue = 255;                               //
  0 - 255, initial value (value read from the potentiometer if useSensorValues = true)
int
  maxSensitivity = 2 * 255;                             // let the 'volume' go up
  to 200%!
int ledBrightness = 30;                                   // 0 - 255,
  initial value (value read from the potentiometer if useSensorValues = true)
int
  sensorDeviationBrightness = 1;                        // eliminate fluctuating values
int
  overflowDelay = 20;                                   // overflow hold time

//
  peak settings
int displayPeaks = true;                                  // value
  will be set by the switch if useSensorValues = true
int droppingPeak = true;
                                  // display dropping peaks or not. note: displayPeaks
  has to be true 
int bouncingPeaks = true;                                 //
  display bouncing peaks or not. note: displayPeaks has to be true 

//
//
  initialize other variables needed for the sketch
//

int numOfSegments
  = stripNumOfLeds / 2;
int halfNumOfSegments = numOfSegments / 2; 
int stripMiddle
  = stripNumOfLeds / 2;
int maxDisplaySegments = stripMiddle - 1;
float sensitivityFactor;

int
  brightnessValue, prevBrightnessValue;
float ledFactor, ledFactor_div_numOfSegments;

int
  leftValue = 0, rightValue = 0, maxReadValue = 0;
int leftAnalogValue = 0, rightAnalogValue
  = 0;

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

uint32_t stripMiddleColor, stripOverflowColor,
  stripHoldColor;

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;

//
// initialize the strip or rings
//

Adafruit_NeoPixel
  strip = Adafruit_NeoPixel(stripNumOfLeds, stripPin, NEO_GRB + NEO_KHZ800);

//
//
  setup
//

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

  #endif
  
  pinMode(showPeaksPin, INPUT);  

  strip.begin();

  
  setStripColors();
  startupAnimation();
  
  if (useSensorValues)
  
    setInitialDisplayPeaks();
  else
    setSensitivityFactor();
}

//
//
  main loop
//

void loop() {
  if (useSensorValues) 
    readSensorValues();

  
  readValues();
  drawValues();

  if (displayPeaks) {
    getPeaks();

    drawPeaks();
  }

  storePrevValues();
}

// 
// functions
//

void
  setInitialDisplayPeaks() {
  readShowPeaksPin = digitalRead(showPeaksPin);

  if (readShowPeaksPin == HIGH)
    displayPeaks = false;
  else
    displayPeaks
  = true;
  prevReadShowPeaksPin = readShowPeaksPin;
}

void readSensorValues()
  {
  readShowPeaksPin = digitalRead(showPeaksPin);

  if (momentarySwitch)
  {
    if (readShowPeaksPin == LOW && prevReadShowPeaksPin == HIGH) {
      if
  (displayPeaks == true) {
        displayPeaks = false;
        clearLeftPeak();

        clearRightPeak();        
        if (momentarySwitch)
          while
  (digitalRead(showPeaksPin) == LOW) {}
      }
      else {
        displayPeaks
  = true;
      }
    }
  } 
  else {
    if (readShowPeaksPin == LOW
  && prevReadShowPeaksPin == HIGH) 
      displayPeaks = true;
    else if (readShowPeaksPin
  == HIGH && prevReadShowPeaksPin == LOW) {
      displayPeaks = false;
      clearLeftPeak();

      clearRightPeak();        
    }
  }
  prevReadShowPeaksPin = readShowPeaksPin;

  
  brightnessValue = analogRead(brightnessPin);
  brightnessValue = map(brightnessValue,
  0, 1023, 0, 255);
  
  if (abs(brightnessValue - prevBrightnessValue) > sensorDeviationBrightness)
  {
    ledBrightness = brightnessValue;
    setStripColors();
    prevBrightnessValue
  = brightnessValue;
  }

  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() {
  leftAnalogValue = analogRead(leftPin);

  rightAnalogValue = analogRead(rightPin);

  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

    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 (leftValue
  > maxDisplaySegments) {
      leftValue = maxDisplaySegments;
      drawOverflow();

  }
  
  if (rightValue > maxDisplaySegments) {
      rightValue = maxDisplaySegments;

      drawOverflow();
  }
}

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

  prevLeftValue
  = leftValue;
  prevRightValue = rightValue;
}

void getPeaks() {

  if (leftValue > leftPeak) {
    leftPeak = leftValue;
    leftPeakTime =
  0;
    leftFirstPeak = true;

    if (bouncingPeaks) {
      leftPeakBouncing
  = true;
      leftPeakBounceCounter = 0;
      leftPeakBounceDelayCounter
  = 0;
    }
  }
  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
  * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - leftPeak));

          if (leftPeakBounce != prevLeftPeakBounce) {
            clearLeftBouncePeak();

          }
          prevLeftPeakBounce = leftPeakBounce;
        }
      }

    }
  }

  if (rightValue > rightPeak) {
    rightPeak = rightValue;

    rightPeakTime = 0;
    rightFirstPeak = true;

    if (bouncingPeaks)
  {
      rightPeakBouncing = true;
      rightPeakBounceCounter = 0;
      rightPeakBounceDelayCounter
  = 0;
    }
  }
  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
  * 0.0174532925) * bouncingPeaksNumOfLeds), (maxDisplaySegments - rightPeak));

          if (rightPeakBounce != prevRightPeakBounce) {
            clearRightBouncePeak();

          }
          prevRightPeakBounce = rightPeakBounce;
        }

      }
    }
  }
}

void drawValues() {
  if (splitStrip) {

    for (i = middleOffset; i < leftValue; i++)
      strip.setPixelColor(i, stripColor[i]);

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

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

      strip.setPixelColor(stripMiddle - i, 0);
  }

  if (displayMiddleLed)
  strip.setPixelColor(stripMiddle, stripMiddleColor);
  strip.show();
}

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


    if (splitStrip)
      strip.setPixelColor((leftPeak + leftPeakBounce), stripHoldColor);

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

    if (splitStrip)
      strip.setPixelColor(stripMiddle
  + rightPeak + prevRightPeakBounce, stripHoldColor);
    else 
      strip.setPixelColor(stripMiddle
  - (rightPeak + prevRightPeakBounce), stripHoldColor);
  }

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

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

  if (droppingPeak)
    leftPeak = leftPeak * peakDropFactor;

  else
    leftPeak = 0;
  leftPeakTime = 0;
}

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

void clearLeftBouncePeak() {
  if
  (splitStrip)
    strip.setPixelColor((leftPeak + prevLeftPeakBounce), 0);

  else
    strip.setPixelColor(stripMiddle + (leftPeak + prevLeftPeakBounce),
  0);
}

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

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

void clearRightBouncePeak()
  {
  if (splitStrip)
    strip.setPixelColor((stripMiddle + rightPeak + prevRightPeakBounce),
  0);
  else
    strip.setPixelColor(stripMiddle - (rightPeak + prevRightPeakBounce),
  0);
}

void drawOverflow() {
  for (i = 0; i <= numOfSegments; i++)
  {
    strip.setPixelColor(stripMiddle + i, stripOverflowColor);
    strip.setPixelColor(stripMiddle
  - i, stripOverflowColor);
  }
  strip.show();
  delay(overflowDelay);


  for (i = 0; i <= numOfSegments; i++) {
    strip.setPixelColor(stripMiddle
  + i, 0);
    strip.setPixelColor(stripMiddle - i, 0);
  }
  strip.show();
}

void
  setStripColors() {
  int orangeLimit;
  ledFactor = (float)ledBrightness /
  255;

  float orangeFactor = orangeLimitAmount / halfNumOfSegments;
  ledFactor_div_numOfSegments
  = ledFactor / numOfSegments;
  
  stripOverflowColor = strip.Color(min(255,
  255 * ledFactor * 1.5), 0, 0);
  stripMiddleColor = strip.Color(0, 0, 255 * ledFactor);


  stripColor[0] = strip.Color(0, 255 * ledFactor, 0);
  for (i = 1; i <= numOfSegments;
  i++) {
    if (i <= halfNumOfSegments)
      orangeLimit = (i * orangeFactor);

    else
      orangeLimit = ((numOfSegments - i) * orangeFactor);

    stripColor[i]
  = strip.Color((255 * i * ledFactor_div_numOfSegments), ((255 - orangeLimit) * (numOfSegments
  - i) * ledFactor_div_numOfSegments), 0); 
  }

  stripHoldColor = stripColor[numOfSegments];
}

void
  startupAnimation() {  
  for (j = 0; j < 2; j++) {
    for (i = 0; i <= numOfSegments;
  i++) {
      strip.setPixelColor(stripMiddle - i, stripColor[i]);
      strip.setPixelColor(stripMiddle
  + i, stripColor[i]);
      strip.show();
      delay(startupAnimationDelay);

    }
    
    for (i = 0; i <= numOfSegments; i++) {
      strip.setPixelColor(stripMiddle
  + i, 0);
      strip.setPixelColor(stripMiddle - i, 0);
      strip.show();

      delay(startupAnimationDelay);
    }
  }
}

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