#include <Keypad.h>
#include <LiquidCrystal.h>
#include <Servo.h>

const int servoPin = 10; // Connect the servo to digital pin 10
Servo doorLock;

const byte ROWS = 4; // Four rows
const byte COLS = 4; // Four columns
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {2, 3, 4, 5}; // Connect these to the row pinouts of the keypad
byte colPins[COLS] = {6, 7, 8, 9}; // Connect these to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

const char* correctPasscode = "1234"; // Change this to your initial passcode

void setup() {
  doorLock.attach(servoPin);
  doorLock.write(90); // Lock the door initially
  lcd.begin(16, 2); // Initialize the LCD
  lcd.setCursor(0, 0);
  lcd.print("Enter passcode:");
}

char newPasscode[5];
byte passcodeIndex = 0;
bool setNewPasscode = false;

void loop() {
  char key = keypad.getKey();
  if (key) {
    if (setNewPasscode) {
      if (key == '#') {
        if (passcodeIndex == 4) {
          newPasscode[4] = '\0'; // Null-terminate the passcode string
          setNewPasscode = false;
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("New passcode set");
          delay(2000);
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Enter passcode:");
        }
      } else if (passcodeIndex < 4) {
        newPasscode[passcodeIndex] = key;
        passcodeIndex++;
      }
    } else {
      if (key == '*') {
        lcd.clear();
        lcd.setCursor(0, 0);
        lcd.print("Set new passcode:");
        setNewPasscode = true;
        passcodeIndex = 0;
      } else if (key == '#') {
        if (strcmp(newPasscode, correctPasscode) == 0) {
          unlockDoor();
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Access granted!");
          delay(2000);
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Enter passcode:");
        } else {
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Access denied!");
          delay(2000);
          lcd.clear();
          lcd.setCursor(0, 0);
          lcd.print("Enter passcode:");
        }
      }
    }
  }
}

void unlockDoor() {
  doorLock.write(0); // Open the door
  delay(2000); // Keep the door open for 2 seconds
  doorLock.write(90); // Close and lock the door
}