const int pirPin = 3;   // PIR sensor output pin
const int ledPin = 2;   // LED pin
const int buzzerPin = 4; // Buzzer pin

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {

  int pirValue = digitalRead(pirPin);

  if (pirValue == HIGH) {
    digitalWrite(ledPin, HIGH);
    digitalWrite(buzzerPin, HIGH);
    delay(2000);  // Buzzer ON for 1 second
    digitalWrite(buzzerPin, LOW);
  } else {
    digitalWrite(ledPin, LOW);
  }
  delay(2000);
}