/*This program test PIR motion sensor. If the sensor detects
  movement, The led will turn on.
  Probably, you need to calibrate the PIR sensor.*/
int led = 13;
int sensor = 4;
int value = 0;

void setup() {
pinMode(led,OUTPUT);
pinMode(sensor,INPUT);
Serial.begin(9600);
}

void loop() {
 value=digitalRead(sensor);//Read the value of digital output on sensor
 //If the value read is HIGH turn on led and
 //Writes "I see you: " on Serial monitor 
 if(value==HIGH){
  digitalWrite(led,HIGH);
  Serial.print("I see you: ");
  Serial.println(value);
 }
// If the value is low turn off led adn Writes "I not see you: "
 else{
  digitalWrite(led,LOW);
  Serial.print("I not see you: ");
  Serial.println(value);
 }

}