neopixel_flames.ino

#include <Adafruit_NeoPixel.h>
#ifdef __AVR__
  #include <avr/power.h>
#endif

#define PIN 5

//  The overall fire brightness
//  (this can affect both color levels and power consumption)
int brightness = 128;

// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(29, PIN, NEO_GRB + NEO_KHZ800);

// IMPORTANT: To reduce NeoPixel burnout risk, add 1000 uF capacitor across
// pixel power leads, add 300 - 500 Ohm resistor on first pixel's data input
// and minimize distance between Arduino and first pixel.  Avoid connecting
// on a live circuit...if you must, connect GND first.
// For the ultimate NeoPixel guide, check out:
// https://learn.adafruit.com/adafruit-neopixel-uberguide/overview

void setup() {
  strip.begin();
  strip.setBrightness(brightness);
  strip.show(); // Initialize all pixels to 'off'
}

void loop() {

  //  Uncomment one of these RGB (Red, Green, Blue) values to
  //  set the base color of the flame.  The color will flickr
  //  based on the initial base color
  
  //  Regular (orange) flame:
    int r = 226, g = 121, b = 35;

  //  Purple flame:
  //  int r = 158, g = 8, b = 148;

  //  Green flame:
  //int r = 74, g = 150, b = 12;

  //  Flicker, based on our initial RGB values
  for(int i=0; i<strip.numPixels(); i++) {
    int flicker = random(0,55);
    int r1 = r-flicker;
    int g1 = g-flicker;
    int b1 = b-flicker;
    if(g1<0) g1=0;
    if(r1<0) r1=0;
    if(b1<0) b1=0;
    strip.setPixelColor(i,r1,g1, b1);
  }
  strip.show();

  //  Adjust the delay here, if you'd like.  Right now, it randomizes the 
  //  color switch delay to give a sense of realism
  delay(random(10,113));
}