Neo Pixels Ring with Arduino Nano

1#include <Adafruit_NeoPixel.h>
2#ifdef __AVR__
3  #include <avr/power.h>
4#endif
5
6#define PIN 2
7
8// Parameter 1 = number of pixels in strip
9// Parameter 2 = Arduino pin number (most are valid)
10// Parameter 3 = pixel type flags, add together as needed:
11//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
12//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
13//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
14//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
15//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
16Adafruit_NeoPixel strip = Adafruit_NeoPixel(8, PIN, NEO_GRB + NEO_KHZ800);
17
18// IMPORTANT: To reduce NeoPixel burnout risk, add 1000 uF capacitor across
19// pixel power leads, add 300 - 500 Ohm resistor on first pixel's data input
20// and minimize distance between Arduino and first pixel.  Avoid connecting
21// on a live circuit...if you must, connect GND first.
22
23void setup() {
24  // This is for Trinket 5V 16MHz, you can remove these three lines if you are not using a Trinket
25  #if defined (__AVR_ATtiny85__)
26    if (F_CPU == 16000000) clock_prescale_set(clock_div_1);
27  #endif
28  // End of trinket special code
29
30  strip.begin();
31  strip.setBrightness(100);
32  strip.show(); // Initialize all pixels to 'off'
33}
34
35void loop() {
36  // Some example procedures showing how to display to the pixels:
37  colorWipe(strip.Color(255, 0, 0), 50); // Red
38  colorWipe(strip.Color(0, 255, 0), 50); // Green
39  colorWipe(strip.Color(0, 0, 255), 50); // Blue
40//colorWipe(strip.Color(0, 0, 0, 255), 50); // White RGBW
41  // Send a theater pixel chase in...
42  theaterChase(strip.Color(127, 127, 127), 50); // White
43  theaterChase(strip.Color(127, 0, 0), 50); // Red
44  theaterChase(strip.Color(0, 0, 127), 50); // Blue
45
46  rainbow(20);
47  rainbowCycle(20);
48  theaterChaseRainbow(50);
49}
50
51// Fill the dots one after the other with a color
52void colorWipe(uint32_t c, uint8_t wait) {
53  for(uint16_t i=0; i<strip.numPixels(); i++) {
54    strip.setPixelColor(i, c);
55    strip.show();
56    delay(wait);
57  }
58}
59
60void rainbow(uint8_t wait) {
61  uint16_t i, j;
62
63  for(j=0; j<256; j++) {
64    for(i=0; i<strip.numPixels(); i++) {
65      strip.setPixelColor(i, Wheel((i+j) & 255));
66    }
67    strip.show();
68    delay(wait);
69  }
70}
71
72// Slightly different, this makes the rainbow equally distributed throughout
73void rainbowCycle(uint8_t wait) {
74  uint16_t i, j;
75
76  for(j=0; j<256*5; j++) { // 5 cycles of all colors on wheel
77    for(i=0; i< strip.numPixels(); i++) {
78      strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
79    }
80    strip.show();
81    delay(wait);
82  }
83}
84
85//Theatre-style crawling lights.
86void theaterChase(uint32_t c, uint8_t wait) {
87  for (int j=0; j<10; j++) {  //do 10 cycles of chasing
88    for (int q=0; q < 3; q++) {
89      for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
90        strip.setPixelColor(i+q, c);    //turn every third pixel on
91      }
92      strip.show();
93
94      delay(wait);
95
96      for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
97        strip.setPixelColor(i+q, 0);        //turn every third pixel off
98      }
99    }
100  }
101}
102
103//Theatre-style crawling lights with rainbow effect
104void theaterChaseRainbow(uint8_t wait) {
105  for (int j=0; j < 256; j++) {     // cycle all 256 colors in the wheel
106    for (int q=0; q < 3; q++) {
107      for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
108        strip.setPixelColor(i+q, Wheel( (i+j) % 255));    //turn every third pixel on
109      }
110      strip.show();
111
112      delay(wait);
113
114      for (uint16_t i=0; i < strip.numPixels(); i=i+3) {
115        strip.setPixelColor(i+q, 0);        //turn every third pixel off
116      }
117    }
118  }
119}
120
121// Input a value 0 to 255 to get a color value.
122// The colours are a transition r - g - b - back to r.
123uint32_t Wheel(byte WheelPos) {
124  WheelPos = 255 - WheelPos;
125  if(WheelPos < 85) {
126    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
127  }
128  if(WheelPos < 170) {
129    WheelPos -= 85;
130    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
131  }
132  WheelPos -= 170;
133  return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
134}