#include <Servo.h>

int pirPin = 2; // digital pin for PIR sensor
int servoPin = 3; // digital pin for servo motor
int ledPin = 4; // digital pin for LED
int buzzerPin = 5; // digital pin for Buzzer

Servo myservo; // create servo object to control a servo

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
  myservo.attach(servoPin); // attaches the servo on pin 3 to the servo object
  Serial.begin(9600);
}

void loop() {
  int pirValue = digitalRead(pirPin);
  
  if (pirValue == HIGH) { // condition for triggering servo, LED and buzzer
    Serial.println("Motion detected!");
    myservo.write(90); // move servo to 90 degrees to unlock the door
    digitalWrite(ledPin, HIGH);
    tone(buzzerPin, 1000);
    delay(1000);
    digitalWrite(ledPin, LOW);
    noTone(buzzerPin);
    delay(5000); // keep the door unlocked for 5 seconds
    myservo.write(0); // move servo back to 0 degrees to lock the door
  }
  else {
    Serial.println("No motion detected.");
    myservo.write(0); // move servo to 0 degrees to lock the door
    digitalWrite(ledPin, LOW);
    noTone(buzzerPin);
  }
}