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

const int ROWS = 4; // Number of rows in the keypad
const int COLS = 4; // Number of columns in the keypad

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}; // Connect to R1, R2, R3, R4 on the keypad
byte colPins[COLS] = {2, 3, 4, 5}; // Connect to C1, C2, C3, C4 on the keypad

const char* correctPassword = "123A"; // Define your correct password here

Servo servo; // Create a servo object
const int servoPin = 10; // Connect to the signal pin of the servo

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

void setup() {
  servo.attach(servoPin); // Attach the servo to its pin
  servo.write(90); // Initialize the servo to the center position
  Serial.begin(9600);
}

void loop() {
  char key = keypad.getKey();
  
  if (key != NO_KEY) {
    Serial.println(key); // Print the pressed key to the Serial Monitor
    
    // Check if the entered key is part of the password
    static int position = 0;
    if (key == correctPassword[position]) {
      position++;
      if (position == strlen(correctPassword)) {
        // Password is correct, run the servo
        Serial.println("Password matched!");
        servo.write(0); // Rotate the servo to one position
        delay(1000); // Wait for 1 second
        servo.write(90); // Return the servo to the center position
        position = 0; // Reset the position for the next attempt
      }
    } else {
      position = 0; // Reset the position if a wrong key is pressed
    }
  }
}