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

// Define the keypad layout
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] = {6, 7, 8, 9}; 
byte colPins[COLS] = {A0, A1, A2, A3}; 

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
Servo doorLock;

// Correct password
const String password = "2207"; 
String inputPassword;

void setup() {
  doorLock.attach(10); // Attach servo on pin 10
  doorLock.write(0); // Lock the door initially
  Serial.begin(9600);
}

void loop() {
  char key = keypad.getKey();
  
  if (key) {
    // Check if the key is a digit
    if (key >= '0' && key <= '9') {
      inputPassword += key; // Append key to inputPassword
      Serial.print("Input: ");
      Serial.println(inputPassword);
    }

    // Check if '#' is pressed
    if (key == 'A') {
      if (inputPassword == password) {
        unlockDoor();
      } else {
        Serial.println("Wrong Password!");
      }
      // Reset the input
      inputPassword = "";
    }

    // Check if '*' is pressed
    if (key == '*') {
      // Reset the input
      inputPassword = "";
      Serial.println("Input Cleared");
    }
  }
}

void unlockDoor() {
  Serial.println("Door Opened!");
  doorLock.write(90); // Move servo to unlock position
  delay(5000); // Keep unlocked for 5 seconds
  doorLock.write(0); // Lock the door again
  Serial.println("Door Closed!");
}