#include <Keypad.h>   // Library for Keypad 
#include <Servo.h>    // Library for Servo Motor 
 
// Define the Keypad size (4x4) 
const byte ROWS = 4; 
const byte COLS = 4; 
 

// Define Keypad keys layout 
char keys[ROWS][COLS] = { 
  {'1', '2', '3', 'A'}, 
  {'4', '5', '6', 'B'}, 
  {'7', '8', '9', 'C'}, 
  {'*', '0', '#', 'D'} 
}; 
 
// Define Arduino digital pins connected to Keypad 
byte rowPins[ROWS] = {9, 8, 7, 6}; 
byte colPins[COLS] = {5, 4, 3, 2}; 
// Create a Keypad object 
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);  
// Create a Servo object 
Servo myServo; 
 
// Define the password 
String password = "1234";  // Change this to set a different password 
String inputPassword = ""; // Variable to store user input 
 

void setup() { 
  Serial.begin(9600);  // Start serial communication 
  myServo.attach(10);  // Connect the servo to pin 10 
  myServo.write(0);    // Set the servo to 0° position (locked) 
} 
 
void loop() { 
  char key = keypad.getKey();  // Read pressed key 
 
  if (key) {  // If a key is pressed 
    Serial.print("Key Pressed: "); 
    Serial.println(key); 
 
    if (key == '#') {  // "#" key is used to confirm the password 
      if (inputPassword == password) {  // Check if password is correct 
        Serial.println("    Correct Password! Unlocking..."); 
        myServo.write(90);  // Rotate servo to 90° (Unlocked) 
        delay(3000);        // Wait for 3 seconds 
        myServo.write(0);   // Reset servo to 0° (Locked) 
  } 



else { 
        Serial.println("   Incorrect Password! Try again.");
        } 
      inputPassword = "";  // Reset input password 
    }  
    else if (key == '*') {  // "*" key clears the input 
      inputPassword = ""; 
      Serial.println("    Input Cleared."); 
    }  
    else { 
      inputPassword += key; // Append pressed key to password input 
    } 
  } 
}