#include <Keypad.h>
#include <LiquidCrystal.h>

// Initialize the LCD (pin numbers may vary depending on your setup)
const int rs = 7, en = 8, d4 = 9, d5 = 10, d6 = 11, d7 = 12;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

// Define the keypad configuration
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] = {A0, A1, A2, A3}; // Connect to the row pinouts of the keypad
byte colPins[COLS] = {2, 3, 4, 5}; // Connect to the column pinouts of the keypad

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

// Predefined password
String password = "1234";
String inputPassword = "";

void setup() {
  lcd.begin(16, 2);
  lcd.print("Enter Password:");
}

void loop() {
  char key = keypad.getKey();
  
  if (key) {
    if (key == '#') {
      if (inputPassword == password) {
        lcd.clear();
        lcd.print("Access Granted");
      } else {
        lcd.clear();
        lcd.print("Access Denied");
        delay(2000); // Wait for 2 seconds
        lcd.clear();
        lcd.print("Enter Password:");
      }
      inputPassword = ""; // Clear the input
    } else if (key == '*') {
      inputPassword = ""; // Clear the input if '*' is pressed
      lcd.clear();
      lcd.print("Enter Password:");
    } else {
      inputPassword += key;
      lcd.setCursor(0, 1); // Move cursor to the second line
      lcd.print(inputPassword);
    }
  }
}