pixel.ino

#include "neopixel/neopixel.h"

SYSTEM_MODE(AUTOMATIC);

#define PIXEL_TYPE WS2812B

Adafruit_NeoPixel strip = Adafruit_NeoPixel(11, D2, PIXEL_TYPE);

void rainbow(Adafruit_NeoPixel, uint8_t);
uint32_t Wheel(Adafruit_NeoPixel, byte);

void setup()
{
  strip.begin();
  strip.show(); // Initialize all pixels to 'off'
}
void loop()
{
  rainbow(strip, 20);
}

void rainbow(Adafruit_NeoPixel s, uint8_t wait) {
  uint16_t i, j;

  for(j=0; j<256; j++) {
    for(i=0; i<s.numPixels(); i++) {
      s.setPixelColor(i, Wheel(s, (i+j) & 255));
    }
    s.show();
    delay(wait);
  }
}

// Input a value 0 to 255 to get a color value.
// The colours are a transition r - g - b - back to r.
uint32_t Wheel(Adafruit_NeoPixel s, byte WheelPos) {
  if(WheelPos < 85) {
   return s.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
  } else if(WheelPos < 170) {
   WheelPos -= 85;
   return s.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  } else {
   WheelPos -= 170;
   return s.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
}