#include <Servo.h>
#include <LiquidCrystal_I2C.h>

#define SERVO_PIN 7
#define PIR_PIN 8
#define BUZZER_PIN 9  // Pin buzzer
#define BUZZER_DELAY 500  // Durasi bunyi buzzer (ms)

bool motionDetected = false;
bool doorLocked = true;  

Servo doorLock;

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

void setup() {
  pinMode(PIR_PIN, INPUT); 
  pinMode(BUZZER_PIN, OUTPUT); // Set pin buzzer sebagai OUTPUT

  doorLock.attach(SERVO_PIN);
  doorLock.write(0);

  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Smart Door Lock");
}

void loop() {
  motionDetected = digitalRead(PIR_PIN);
  if (motionDetected) {
    if(doorLocked){
      unlockDoor();
    } else {
      lockDoor();
    }  
  }
  delay(200);
}

void unlockDoor() {
  doorLocked = false;
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("Motion Detected");
  LCD.setCursor(0, 1);
  LCD.print("Door Unlocked");
  soundBuzzer(); // Panggil fungsi untuk bunyi buzzer
  delay(1000);
  LCD.clear();
  LCD.print("Selamat Datang");
  doorLock.write(180);

  delay(5000);             
  doorLocked = true;
  lockDoor();
}

void lockDoor() {
  doorLock.write(0);
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("Door Locked");
  soundBuzzer(); // Panggil fungsi untuk bunyi buzzer
}

void soundBuzzer() {
  tone(BUZZER_PIN, 1000); // Menghasilkan nada 1000 Hz pada pin buzzer
  delay(BUZZER_DELAY); // Delay untuk durasi bunyi buzzer
  noTone(BUZZER_PIN); // Matikan bunyi buzzer
}