#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>

// Define pin connections
const int ldrPin = 36;
const int relayPin = 26;
const int ledPin = 25;
const int buzzerPin = 27;
const int servoPin = 23;

// Initialize LCD
LiquidCrystal_I2C lcd(0x27, 16, 2); // Adjust the I2C address

// Initialize Servo
Servo myServo;

// Threshold for LDR
int ldrThreshold = 500;

void setup() {
  // Initialize serial communication
  Serial.begin(115200);

  // Initialize LCD
  lcd.init();
  lcd.backlight();

  // Initialize Servo
  myServo.attach(servoPin);
  myServo.write(0); // Ensure the door is initially closed

  // Initialize pins
  pinMode(ldrPin, INPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);

  // Start with everything off
  digitalWrite(relayPin, LOW);
  digitalWrite(ledPin, LOW);
  digitalWrite(buzzerPin, LOW);

  // Display initial message
  lcd.setCursor(0, 0);
  lcd.print("Security System");
  lcd.setCursor(0, 1);
  lcd.print("Initializing...");
  delay(2000);
  lcd.clear();
}

void loop() {
  int ldrValue = analogRead(ldrPin);
  Serial.print("LDR value: ");
  Serial.println(ldrValue);

  if (ldrValue > ldrThreshold) {
    // Unauthorized access detected
    digitalWrite(relayPin, HIGH); // Lock the door
    digitalWrite(ledPin, HIGH); // Turn on LED
    digitalWrite(buzzerPin, HIGH); // Sound the buzzer

    myServo.write(90); // Move servo to open position

    // Display alert message on LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("ALERT: Unauthorized");
    lcd.setCursor(0, 1);
    lcd.print("Access Detected!");
  } else {
    // No unauthorized access
    digitalWrite(relayPin, LOW); // Unlock the door
    digitalWrite(ledPin, LOW); // Turn off LED
    digitalWrite(buzzerPin, LOW); // Stop the buzzer

    myServo.write(0); // Move servo to closed position

    // Display system status on LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("System Status:");
    lcd.setCursor(0, 1);
    lcd.print("All Secure");
  }

  delay(1000); // Delay for stability
}