#include <ESP32Servo.h>
// Import the required library to setup the LCD
#include <LiquidCrystal_I2C.h>

#define SERVO_PIN 14 
#define PIR_PIN 25 
#define BUZZER_PIN 19
  
bool motionDetected = false;
// Declare the flag variable doorLocked and set intial value to false
bool doorLocked = true;  

Servo doorLock;

// Setup the LCD
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  pinMode(PIR_PIN, INPUT); 
  pinMode(BUZZER_PIN, OUTPUT);

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

  // Initilise the display and display the message
  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Smart Door Lock");
}

void loop() {
  motionDetected = digitalRead(PIR_PIN);
  if (motionDetected) {
      // Check whether the door is locked or not. Accordingly, call unlock the door and lock the door functions.
      if(doorLocked){
         unlockDoor();
      }else{
        lockDoor();
      }  
  }
 delay(200);
}



void unlockDoor() {
  // Set doorLocked value to false
  doorLocked = false;
  // Display the message "Motion Detected Door Unlokced"
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("Motion Detected");
  LCD.setCursor(0, 1);
  LCD.print("Door Unlocked");
  doorLock.write(90);
  tone(BUZZER_PIN, 1000);
  delay(300);
  tone(BUZZER_PIN, 0);
  // Door remains unlocked for 5 seconds
  delay(5000);             
  // After 5 seconds set the doorLocked value to true and call lockDoor function            
  doorLocked = true;
  lockDoor();
}


void lockDoor() {
  doorLock.write(0);
  // Display the message "Door Lokced"            
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("Door Locked");
}