int pir = 3;
int buzzer = 2;
int led = 4;
int val=0;
void setup() {
  // put your setup code here, to run once:
    pinMode(pir, INPUT);
    pinMode(buzzer, OUTPUT);
    pinMode(led, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  val=digitalRead(pir);
  if(val==HIGH){
    digitalWrite(led, HIGH);
    delay(100);
    digitalWrite(led, LOW);
    delay(100);
    digitalWrite(buzzer, HIGH);
    delay(100);
    digitalWrite(buzzer, LOW);
  }
  else{
    digitalWrite(led, LOW);
    digitalWrite(buzzer, LOW);
  }
}