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

// LCD configuration
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Servo motor
Servo myservo;
const int servoPin = 4;  // GPIO pin to control servo

// Keypad
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {5, 12, 13, 14};  // Row pins (R1-R4)
byte colPins[COLS] = {16, 17, 18, 19}; // Column pins (C1-C4)
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// Relay module
const int relayPin = 15;  // GPIO pin to control relay

// Buzzer
const int buzzerPin = 2;  // GPIO pin to control buzzer

String inputPassword = "";
const String correctPassword = "1234";

void setup() {
  Wire.begin();
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Enter Password:");

  // Attach servo to pin
  myservo.attach(servoPin);
  pinMode(relayPin, OUTPUT);
  digitalWrite(relayPin, LOW); // Ensure relay is initially off

  pinMode(buzzerPin, OUTPUT);
  digitalWrite(buzzerPin, LOW); // Ensure buzzer is initially off

  Serial.begin(115200);
}

void loop() {
  char key = keypad.getKey();
  if (key != NO_KEY) {
    if (key == '#') {
      // Check password
      if (inputPassword == correctPassword) {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Access Granted");
        myservo.write(90); // Move servo to 90 degrees
        digitalWrite(relayPin, HIGH); // Turn on relay
         // Turn off buzzer
        delay(5000); // Keep relay on for 5 seconds
        myservo.write(0); // Return servo to 0 degrees
        digitalWrite(relayPin, LOW); // Turn off relay
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Enter Password:");
      } else {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Access Denied");
        digitalWrite(buzzerPin, HIGH); // Turn on buzzer
        delay(1000); // Keep buzzer on for 1 second
        digitalWrite(buzzerPin, LOW); // Turn off buzzer
        delay(2000); // Display "Access Denied" for 2 seconds
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Enter Password:");
      }
      inputPassword = ""; // Reset input password
    } else if (key == '*') {
      // Clear input
      inputPassword = "";
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Enter Password:");
    } else {
      // Append key to password
      inputPassword += key;
      lcd.setCursor(0, 1);
      lcd.print(inputPassword);
    }
  }
}