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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const byte col = 4;
const byte bar = 4;
char datakey[col][bar] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte colpin[col] = {9, 8, 7, 6};
byte barpin[bar] = {5, 4, 3, 2};

Keypad keypad = Keypad(makeKeymap(datakey), colpin, barpin, col, bar);

String pass = "";
const String benar = "1212";

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.print("Enter Password:");
  lcd.setCursor(0, 1);
}

void loop() {
  char key = keypad.getKey();
  if (key) {
    if (key == 'D') { // Cek password
      lcd.clear();
      lcd.print(pass == benar ? "Pass Benar!" : "Pass Salah!");
      delay(2000); // Tahan hasil selama 2 detik
      resetDisplay();
    } else if (key == '#') { // Reset input
      resetDisplay();
    } else { // Input password
      pass += key;
      lcd.print('*');
    }
  }
}

void resetDisplay() {
  pass = ""; // Reset password
  lcd.clear();
  lcd.print("Enter Password:");
  lcd.setCursor(0, 1);
}