int led=13;
 int pir=2;
 int pristate=0;
 int val=0;
 void setup() {
 pinMode(led,OUTPUT);  
 pinMode(pir,INPUT_PULLUP);
 Serial.begin(9600); 
}

void loop() {
val=digitalRead(pir);
if(val=HIGH)

{
  digitalWrite(led, HIGH);
  if(pristate==LOW)
  {
    Serial.println("door open");
    delay(500);
  }
}
else {
  digitalWrite(led, LOW);
  Serial.println("door close");
  delay(500);
}
}