Fire matrix

#include <FastLED.h>

#define LED_PIN     3
#define COLOR_ORDER GRB
#define CHIPSET     WS2812B
#define NUM_LEDS    5
#define NUM_COLS    12
#define TOT_LEDS NUM_COLS*NUM_LEDS

#define BRIGHTNESS  200
#define FRAMES_PER_SECOND 30

#define COOLING  55
#define SPARKING 120


CRGB leds[TOT_LEDS];

void setup() {
  delay(3000); // sanity delay
  FastLED.addLeds<CHIPSET, LED_PIN, COLOR_ORDER>(leds, TOT_LEDS).setCorrection( TypicalLEDStrip );
  FastLED.setBrightness( BRIGHTNESS );
//  Serial.begin(9600);
}

void loop()
{
  // Add entropy to random number generator; we use a lot of it.
  random16_add_entropy( random());

  Fire2012(); // run simulation frame

  FastLED.show(); // display this frame
  FastLED.delay(1000 / FRAMES_PER_SECOND);
}




void Fire2012()
{
// Array of temperature readings at each simulation cell

  static byte heat[TOT_LEDS];

  for ( int C = 0; C < NUM_COLS; C++) {
//  Serial.println(C);

    // Step 1.  Cool down every cell a little
    for( int i = 0; i < NUM_LEDS; i++) {
      heat[i + C] = qsub8( heat[i + C],  random8(0, ((COOLING * 10) / NUM_LEDS) + 2));
    }

    // Step 2.  Heat from each cell drifts 'up' and diffuses a little
    for( int k= NUM_LEDS - 1; k >= 2; k--) {
      heat[k + C] = (heat[k - 1 + C] + heat[k - 2 + C] + heat[k - 2 + C] ) / 3;
    }

    // Step 3.  Randomly ignite new 'sparks' of heat near the bottom
    if( random8() < SPARKING ) {
      int y = random8(7);
      heat[y + C] = qadd8( heat[y + C], random8(160,255) );
    }

  }
    // Step 4.  Map from heat cells to LED colors
    for( int j = 0; j < TOT_LEDS; j++) {
      leds[j] = HeatColor( heat[j]);
    }

}