#define PIR 2
#define LED 13

int state = LOW;
int val = LOW;

void setup() {
  Serial.begin(9600);
  pinMode(LED, OUTPUT);
  pinMode(PIR, INPUT);
}

void loop() {
  val = digitalRead(PIR);
  if(val==HIGH){
    digitalWrite(LED, HIGH);
    delay(500);

    if(state==LOW){
      Serial.println("Motion Detected!");
      state=HIGH;
    }
  }
  else{
    digitalWrite(LED, LOW);
    delay(500);

    if(state==HIGH){
      Serial.println("Motion Stopped!");
      state=LOW;
    }
  }
}