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Arduino Sound Sensor Module - LM393

http://www.goodluckbuy.com/arduino-sound-sensor-module-for-sensor-shield...

 

int sensorPin = 4; // select the input pin for the sensor
int ledPin = 13; // select the pin for the LED
int val = 0; // variable to store the value coming from the sensor

void setup()
{
  pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
  Serial.begin(9600); // initialize serial communication with computer
}

void loop()
{
  val = analogRead(sensorPin); // read the value from the sensor;
  Serial.println(val); // send it to the computer (as ASCII digits); 
  digitalWrite(ledPin, HIGH); // turn the ledPin on;
  delay(val); // stop the program for some time; 
  digitalWrite(ledPin, LOW); // turn the ledPin off; 
  delay(val); // stop the program for some time
}