#include <Keypad.h>
#include <ESP32Servo.h>  // Use ESP32Servo library

#define SERVO_PIN 18

const String password = "1234";  // Set your password here
String inputPassword = "";

Servo myServo;

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] = {13, 12, 14, 27}; 
byte colPins[COLS] = {26, 25, 33, 32};

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

void setup() {
  Serial.begin(115200);
  myServo.attach(SERVO_PIN);
  myServo.write(0);  // Initial locked position
  Serial.println("Enter password:");
}

void loop() {
  char key = keypad.getKey();

  if (key) {
    Serial.print(key);

    if (key == '*') {
      inputPassword = "";
      Serial.println("\nCleared input");
      return;
    }

    if (key == '#') {
      Serial.println();
      if (inputPassword == password) {
        Serial.println("Password correct! Unlocking...");
        unlockServo();
      } else {
        Serial.println("Incorrect password!");
      }
      inputPassword = "";
    } else {
      inputPassword += key;
    }
  }
}

void unlockServo() {
  myServo.write(90);  // Unlock position
  delay(3000);
  myServo.write(0);   // Lock position
}