This example code is for Clap to Turn On The Light's Tutorial.

Clap.ino

/*
  This example code is for Clap to Turn On The Light's Tutorial.
  Product page:
  Maker UNO: https://www.cytron.io/p-maker-uno
  Sound Sensor : https://www.cytron.io/p-so-mic-mod
  Created by:
  24/07/18  Suad Anwar, Cytron Technologies
*/

int SoundSensor = 10;
int yellow = 4;
int value = 0;
int flag = 0;

void setup() {
  pinMode(yellow, OUTPUT);
  pinMode(SoundSensor, INPUT);
}

void loop() {
  value = digitalRead(SoundSensor); // To get the Sound Sensor's value

  if (value == 1) {

    if (flag == 1) {
      digitalWrite(yellow, HIGH);
      flag = 0;
    }

    else if (flag == 0) {
      digitalWrite(yellow, LOW);
      flag = 1;
    }
    delay(200);
  }
}