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

const int up = 2;
const int down = 3;

int nomor = 0;

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(up, INPUT_PULLUP);
  pinMode(down, INPUT_PULLUP);
}

void loop() {
  byte tombol1 = digitalRead(up);
  byte tombol2 = digitalRead(down);

  if (tombol1 == LOW && nomor < 23) {
    nomor++;
    delay(200);
  }

  if (tombol2 == LOW && nomor > 0) {
    nomor--;
    delay(200);
  }

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Nomor Urut : ");
  if (nomor < 10) {
    lcd.print("0");
  }
  lcd.print(nomor);
}