Arduino IDE Coding

int soundSensor = 2;
int led = 8;

int state;

void setup()
{
  pinMode(soundSensor, INPUT);
  pinMode(led, OUTPUT);

  Serial.begin(9600);
}

void loop()
{
  state = digitalRead(soundSensor);

  Serial.println(state);

  // Clap detected
  if(state == HIGH)
  {
    digitalWrite(led, HIGH);
  }
  else
  {
    digitalWrite(led, LOW);
  }

  delay(100);
}

5. Explanation

Read Sensor

state = digitalRead(soundSensor);

Reads clap detection from sensor.

Clap Detection

if(state == LOW)

When clap sound occurs:

Sensor output becomes LOW
LED turns ON

No Sound

else

LED remains OFF.