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

const int rs = 13, en = 12, d4 = 11, d5 = 10, d6 = 9, d7 = 8;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

const uint8_t ROWS = 4;
const uint8_t COLS = 4;
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};

uint8_t colPins[COLS] = { 3, 2, 1, 0 }; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = { 7, 6, 5, 4 }; // Pins connected to R1, R2, R3, R4

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

String currentInput = ""; // Variabel untuk menyimpan input saat ini

void setup() {
  lcd.begin(16, 2);
  lcd.setCursor(0, 0);
  lcd.print("Taufik");
}

void loop() {
  char key = keypad.getKey();

  if (key != NO_KEY) {
    if (key == 'C') {
      // Tombol "C" ditekan, maka hapus karakter terakhir
      if (currentInput.length() > 0) {
        currentInput = currentInput.substring(0, currentInput.length() - 1);
      }
    } else {
      currentInput += key;
    }

    lcd.setCursor(0, 1);
    lcd.print("                "); // Hapus tampilan sebelumnya
    lcd.setCursor(0, 1);
    lcd.print(currentInput);
  }
}