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

const int servoPin = 9; // Connect the servo to digital pin 9
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] = {5, 4, 3, 2}; // Connect these to the row pinouts of the keypad
byte colPins[COLS] = {13, 12, 11, 10}; // Connect these to the column pinouts of the keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

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

void setup() {
  doorLock.attach(servoPin);
  doorLock.write(90); // Lock the door initially
  Serial.begin(9600);
  pinMode(8, OUTPUT);
}

void loop() {
  char key = keypad.getKey();
  if (key) {
    Serial.print("Entered: ");
    Serial.println(key);

    if (key == '1234') {
      unlockDoor();
      digitalWrite(8, HIGH);
      delay(1000);
    } else {
      // Collect the entered passcode
      static char enteredPasscode[5];
      static byte passcodeIndex = 0;
      enteredPasscode[passcodeIndex] = key;
      passcodeIndex++;

      if (passcodeIndex == 4) {
        enteredPasscode[4] = '\0'; // Null-terminate the passcode string
        if (strcmp(enteredPasscode, correctPasscode) == 0) {
          unlockDoor();
        } else {
          Serial.println("Incorrect passcode!");
        }

        // Reset the passcode entry
        passcodeIndex = 0;
      }
    }
  }
}

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