source code

            #include 

                #define LED_PIN 3
                #define NUM_LEDS 6
                #define BRIGHTNESS 255
                #define LED_TYPE WS2811
                #define COLOR_ORDER RGB
                CRGB leds[NUM_LEDS];
                
                
                int soundDetectedPin = 10;    // Use Pin 10 as our Input
                int soundDetectedVal = HIGH;  // This is where we record our Sound
                //Measurement
                boolean bAlarm = false;
                unsigned long lastSoundDetectTime;  // Record the time that we
                //measured a sound
                
                int soundAlarmTime = 500;  // Number of milli seconds to keep the
                //sound alarm high
                
                void setup() {
                  Serial.begin(9600);
                  pinMode(soundDetectedPin, INPUT);  // input from the Sound
                  //Detection Module
                  FastLED.addLeds(leds, NUM_LEDS).setCorrection(TypicalLEDStrip);
                  FastLED.setBrightness(BRIGHTNESS);
                }
                void loop() {
                  soundDetectedVal = digitalRead(soundDetectedPin);  // read the
                  //sound alarm time
                  if (soundDetectedVal == LOW)  // If we hear a sound
                  {
                    lastSoundDetectTime = millis();  // record the time of the sound
                    //alarm
                    // The following is so you don't scroll on the output screen
                    if (!bAlarm) {
                      Serial.println("LOUD, LOUD");
                
                      bAlarm = true;
                      // fill_solid(leds, NUM_LEDS, CHSV(257, 255, 255));
                      // FastLED.show();
                      // delay(10);
                      // leds[0] = CHSV(255, 200, 200);
                      for (int i = 255; i >= 0; i--) {
                        fill_solid(leds, NUM_LEDS, CHSV(257, 255, i));
                        delay(10);
                        FastLED.show();
                      }
                    }
                
                
                    // Fade the LED in and out
                    // for (int i = 0; i < 256; i++) {
                    //   CRGB col = CRGB(i, i, i);
                    //   fill_solid(leds, NUM_LEDS, col);
                
                    // }
                
                
                  } else {
                    if ((millis() - lastSoundDetectTime) > soundAlarmTime && bAlarm) {
                      Serial.println("quiet");
                      bAlarm = false;
                      //   // Fade the LED in and out
                
                      //   // leds[0] = CHSV(255, 0, 0);
                      fill_solid(leds, NUM_LEDS, CHSV(170, 0, 0));
                
                      FastLED.show();
                      delay(10);
                    }
                  }