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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const byte ROWS = 4; //jumlah baris keypad
const byte COLS = 4; //jumlah kolom keypad

char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowPins[ROWS] = {14, 12, 19, 18}; //R1, R2, R3, R4
byte colPins[COLS] = {5, 4, 2, 15}; //C1, C2, C3, C4

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

const char *password = "3033";
char enteredPassword[5];
int passwordIndex = 0;

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Press :");
}

void loop() {
  char key = keypad.getKey();
  
  if (key) {
    lcd.setCursor(6, 0); // Set kursor ke posisi setelah kata "Press"
    lcd.print(key); // Tampilkan karakter yang ditekan
    lcd.setCursor(passwordIndex, 1);
    lcd.print('*');
    enteredPassword[passwordIndex] = key;
    passwordIndex++;
    
    if (passwordIndex == 4) {
      lcd.clear();
      passwordIndex = 0;
      
      if (strcmp(enteredPassword, password) == 0) {
        lcd.print("Password correct!");
      } else {
        lcd.print("Invalid password!");
      }
      
      delay(2000);
      lcd.clear();
      lcd.print("Press");
      memset(enteredPassword, 0, sizeof(enteredPassword));
    }
  }
}