The code below demonstrate a simple instance. When someone moves before the sensor, 

the led on the arduino board light and "1" is printed on the serial monitor.



const int ledPin=13;//The led to indicate the motion

 

void setup(){

Serial.begin(9600);

pinMode(2, INPUT);//Use pin 2 to receive the signal outputted by the module 

pinMode(ledPin, OUTPUT);

}

 

void loop() {

int sensorValue = digitalRead(2);

if(sensorValue==1)

digitalWrite(ledPin,HIGH);

else

digitalWrite(ledPin,LOW);

Serial.println(sensorValue, DEC);//Print the state of the signal through the serial monitor.

}