#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 16 chars and 2 line display

const byte numRows = 4;
const byte numCols = 4;
String password = "2023";
String inputPassword = "";
char keypressed;
char keymap[numRows][numCols] =
{
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins[numRows] = {10, 9, 8, 7};
byte colPins[numCols] = {6, 5, 4, 3};

Keypad myKeypad = Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Enter Password:");
}

void loop() {
  keypressed = myKeypad.getKey();
  
  if (keypressed != NO_KEY && keypressed != '#') {
    inputPassword += keypressed;
    lcd.setCursor(0, 1);
    lcd.print(inputPassword);
  }
  
  if (keypressed == '#') {
    if (inputPassword == password) {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Access Granted!");
      delay(3000);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Enter Password:");
      inputPassword = "";
    } else {
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Access Denied!");
      delay(3000);
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("Enter Password:");
      inputPassword = "";
    }
  }
  
  delay(100);
}