#define PIR_PIN 2   // Pin where the PIR sensor is connected
#define BUZZER_PIN 3 // Pin where the buzzer is connected
#define LED_PIN 4    // Pin where the LED is connected

void setup() {
  pinMode(PIR_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  
  Serial.begin(9600);
}

void loop() {
  int motionDetected = digitalRead(PIR_PIN);
  
  if (motionDetected == HIGH) {
    digitalWrite(BUZZER_PIN, HIGH); // Sound the alarm
    digitalWrite(LED_PIN, HIGH);    // Turn on the LED
    Serial.println("Motion detected!");
  } else {
    digitalWrite(BUZZER_PIN, LOW);  // Turn off the alarm
    digitalWrite(LED_PIN, LOW);     // Turn off the LED
    Serial.println("No motion.");
  }
  
  delay(500); // Delay for half a second
}