#include <FastLED.h>
#define LED_PIN 3
#define NUM_LEDS 24
#define LED_TYPE WS2812
#define COLOR_ORDER GRB
CRGB leds[NUM_LEDS];
const uint8_t led_count[] = {24, 0, 0};
// const uint8_t led_count[] = {24, 0, 0, 0, 0, 0};
// const uint8_t led_count[] = {24, 0, 0, 0, 0, 0, 0};
#define NUM_RINGS (sizeof(led_count) / sizeof(led_count[0]))
#define FIRE_WIDTH 24
#define FIRE_HEIGHT NUM_RINGS
static uint8_t heat[FIRE_WIDTH][FIRE_HEIGHT];
void setup() {
FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
}
void loop() {
static uint8_t flash = 0;
if (random(750) == 0)
flash = 120;
Fire2012(qadd8(random8() / 2 + 90, flash));
flash = qsub8(flash, 1);
CRGB *led = leds;
uint8_t ring = NUM_RINGS - 1;
// map the modified Fire2012() onto the ring
for (uint8_t i = 0; i < 24 ; i++) {
uint8_t h = heat[i][ring];
*led++ = HeatColor(qadd8(h, flash));
}
FastLED.show();
}
void Fire2012(uint8_t activity) {
for (uint8_t h = 0; h < FIRE_WIDTH; h++) {
// Step 1. Cool down every cell a little
for( uint8_t i = 0; i < FIRE_HEIGHT; i++) {
heat[h][i] = qsub8( heat[h][i], random8(27));
}
// Step 2. Heat from each cell drifts 'up' and diffuses a little
for( uint8_t k = FIRE_HEIGHT - 1; k >= 1; k--) {
uint8_t hleft = (h + FIRE_WIDTH - 1) % FIRE_WIDTH;
uint8_t hright = (h+1) % FIRE_WIDTH;
heat[h][k] = (heat[h][k]
+ heat[hleft][k - 1]
+ heat[h][k - 1]
+ heat[hright][k - 1] ) / 4;
}
if( random8() < activity ) {
heat[h][0] = qadd8( heat[h][0], random8(42));
}
}
}