Voice Sound Detection Sensor Module for official Arduino boards. For sound detection module has two outputs: There is a mounting screw hole 3mm Uses 5v DC power supply With analog output High sensitive microphone and high sensitivity amplifier A power indicator LED The comparator output is a LED Here's a simple sketch for testing: int Led=13;//define LED interface int buttonpin=3 //Define D0 Sensor Interface int val;//define numeric variables val void setup() {pinMode(Led OUTPUT);// Define LED as output interface pinMode(buttonpin INPUT);//Define D0 Sensor as output Interface } void loop() {val=digitalRead(buttonpin);//digital interface will be assigned a value of 3 to read val if(val==HIGH)//When the light sensor detects a signal is interrupted LED flashes {digitalWrite(Led HIGH)} else {digital Write(Led LOW)}} int sensorPin = A5; // select the input pin for the potentiometer int ledPin = 13; // select the pin for the LED int sensorValue = 0; // variable to store the value coming from the sensor void setup() {pinMode(ledPin OUTPUT);Serial.begin(9600);} void loop() {sensorValue = analogRead(sensorPin); digitalWrite(ledPin HIGH); delay(sensorValue); digitalWrite(ledPin LOW); delay(sensorValue); Serial.println(sensorValue DEC); }