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https://www.youtube.com/watch?v=o6_UYb6I4x4
create led matrix/grid effects
#include <FastLED.h>
#include <Wire.h>
#include <VL53L1X.h>
 
 
VL53L1X sensor;
 
 #define LED_PIN     15
 #define COLOR_ORDER GRB
 #define CHIPSET     WS2812
 #define NUM_LEDS    (kMatrixWidth * kMatrixHeight)
 #define FRAMES_PER_SECOND 60
 //////////////////////////////////////////////////////
 const uint8_t kMatrixWidth  = 20;
 const uint8_t kMatrixHeight = 10;
 const bool    kMatrixSerpentineLayout = true;
 //////////////////
 int BRIGHTNESS = 5;
 
//////////////////////////////////////////////////
bool gReverseDirection = false;
 
CRGB leds[NUM_LEDS];
 
void setup() {
Serial.begin(115200);
Serial.println("*** Inicialization");
///////////////////////////////////////////////
delay(3000); // sanity delay
FastLED.addLeds<CHIPSET, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
FastLED.setBrightness( BRIGHTNESS );
 
 
  Wire.begin();
  Wire.setClock(400000); // use 400 kHz I2C
  sensor.setTimeout(500);
  while (!sensor.init())
  {
    Serial.println("Failed to detect and initialize sensor!");
    delay(100);
  }
  Serial.println("INIT");
 
  sensor.setDistanceMode(VL53L1X::Long);
  sensor.setMeasurementTimingBudget(33000);
 
  // Start continuous readings at a rate of one measurement every 50 ms (the
  // inter-measurement period). This period should be at least as long as the
  // timing budget.
  sensor.startContinuous(33);
}
/////////////////////////////////// end setup
 
int COOLING = 90; //this is hack
 
void loop()
{
 Fire2012();
 FastLED.show(); // display this frame
 
 FastLED.delay(1000 / FRAMES_PER_SECOND); //TODO: change thi time measure
 
 
  auto ss = sensor.read();
  static int s = 0;
  Serial.print(ss);
  if (sensor.timeoutOccurred()) { Serial.print(" TIMEOUT"); }
  else { 
    COOLING = ss/10; // burimas cia
        Serial.print(",");   Serial.print(COOLING);  
    //FastLED.delay(ss /10); 
    }
 
    int aaa = analogRead(A0);
    if (aaa<690) { BRIGHTNESS --; FastLED.setBrightness(BRIGHTNESS); }
    if (aaa>720) { BRIGHTNESS ++; FastLED.setBrightness(BRIGHTNESS); }
    if (BRIGHTNESS < 1) BRIGHTNESS = 1;
    if (BRIGHTNESS >= 255) BRIGHTNESS = 255;
     FastLED.setBrightness( BRIGHTNESS );
    Serial.print(",");   Serial.print(aaa);    
    Serial.print(",");   Serial.print(BRIGHTNESS);
    Serial.println();
 }
 
 void Fire2012()
 {
 
  int SPARKING = 100;
   // Array of temperature readings at each simulation cell
 
    static byte heat[kMatrixWidth] [kMatrixHeight];
 
    // Step 1.  Cool down every cell a little
    for (int n = 0; n< kMatrixHeight; n++)
   {
 
     for ( int i = 0; i < kMatrixWidth; i++) {
       heat[i][n] = qsub8( heat[i][n],  random8(0, 
       ((COOLING * 10) / (kMatrixWidth)) + 2));
       }
 
       // Step 2. 
      for ( int k = (kMatrixWidth- 1); k >= 2; k--) {
      heat[k][n] = (heat[k - 1][n] + heat[k - 2][n] + 
      heat[k - 2][n] ) / 3;
      }
 
       // Step 3. 
      if ( random8() < SPARKING ) {
       int y = random8(3);
       heat[y][n] = qadd8( heat[y][n], random8(160, 255) );
      }
     }
 
  // Step 4.  Map from heat cells to LED colors
 
for ( int i= 0; i < kMatrixWidth; i++) {
  for (int j = 0; j < kMatrixHeight; j++) {
 
    CRGB color = HeatColor(heat[i][j]);
    leds[XY(i, j)] = color;
 
     }
   }
 
 }
 
   /////////////
    uint16_t XY( uint8_t x, uint8_t y)
    {
    uint16_t i;
    if ( kMatrixSerpentineLayout == false) {
    i = (y * kMatrixWidth) + x;
    }
    if ( kMatrixSerpentineLayout == true) {
    if ( y & 0x01) {
     // Odd rows run backwards
     uint8_t reverseX = (kMatrixWidth - 1) - x;
     i = (y * kMatrixWidth) + reverseX;
     } else {
    // Even rows run forwards
      i = (y * kMatrixWidth) + x;
     }
    }
 
    return i;
 
   }/////