Percussion Knock Sensor Module (KY-031)

Knock sensor module and a digital 13 interface, built-in LED build a simple circuit to produce percussion flasher. Interface comes with digital LED, will knock sensor connected digital 3 interface, when percussion sensor senses measure to percussive signals, LED flashing light.      Routines source code:    int Led = 13;// define LED Interface    int Shock = 3;// define the percussion Sensor Interface    int val;// define numeric variables val    void setup ()    {    pinMode (Led, OUTPUT) ;// define LED as output interface    pinMode (Shock, INPUT) ;// define knock sensor output interface    }    void loop ()    {    val = digitalRead (Shock) ;// read digital interface is assigned a value of 3 val    if (val == HIGH) // When the percussion when the sensor detects a signal, LED flashes    {    digitalWrite(Led, LOW);    }    else    {    digitalWrite(Led, HIGH);    }    }