#include "FastLED.h"
 
#define DATA_PIN 3
 
#define BRIGHTNESS 255

#define NUM_ROWS 10
#define NUM_COLS 12
#define NUM_LEDS NUM_ROWS * NUM_COLS
 
CRGB leds[NUM_LEDS];

DEFINE_GRADIENT_PALETTE( firepal ) {    // define fire palette
   0,     0,  0,  0,   //black
  32,   255,  0,  0,  // red
  190,  255, 255, 0, //yellow
  255,  255, 255, 255  // white
};
CRGBPalette16 myPal = firepal;
 
void setup() {
  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
  FastLED.setBrightness(BRIGHTNESS);
}
 
 
void loop() {
 
  int  a = millis();
    for (int j = 0; j < NUM_ROWS; j++) {
      for (int i = 0; i < NUM_COLS; i++) {
        leds[XY(i,j)] = CHSV (sin8(i*8+sin8(i*2+a/9))/2+sin8(j*8+sin8(j*2+a/8)/2),255,255);
    }                                                              
  }
 
  FastLED.delay(5);
  
}
 
uint8_t XY (uint8_t x, uint8_t y) { return (y * NUM_COLS + x);}     //simple function to find led number in led matrix, 
                                                                    //change this to your routine
                                                                    //or generate XY function for your matrix there:
                                                                    //https://macetech.github.io/FastLED-XY-Map-Generator/