int sensor = 2; // Connected to digital output of KY-038 sound sensor module
int led = 13; // Connected to postive of led
boolean is_on = false; //To determine/track if led is on or off

void setup() {
  pinMode(sensor, INPUT); //Setting the pin to input for reading data
    pinMode(led, OUTPUT); //Setting the pin to output for turning the led on/off

    }

    void loop() {

      int data = digitalRead(sensor); //Reading data from sensor and storing in variable

        if (data == 1) { // 1 is sent from sensor when loud noise is detected
            if (is_on == true) { // If led is on then turn it off
                  digitalWrite(led, LOW);
                   is_on = false;
                            }
                                else { // else if led is off then turn it on
                                      digitalWrite(led, HIGH);
                                            is_on = true;
                                                }
                                                  }
                                                  }