void changeFireColor() {
          int red = random(150, 255);
          int green = random(50, 150);
          int blue = 0;
          pixels.setPixelColor(0, pixels.Color(red, green, blue));
          pixels.show();
          }
          
          void fireEffect() {
          int flicker = random(0, 30);
          pixels.setBrightness(255 - flicker);
          pixels.show();
          delay(random(20, 50));
          }
          
          void simulateSparks() {
          digitalWrite(LED_RED, HIGH);
          delay(random(10, 50));
          digitalWrite(LED_RED, LOW);
          
          digitalWrite(LED_YELLOW, HIGH);
          delay(random(10, 50));
          digitalWrite(LED_YELLOW, LOW);
          
          digitalWrite(LED_GREEN, HIGH);
          delay(random(10, 50));
          digitalWrite(LED_GREEN, LOW);
          }