#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);
int a = 0;
int i;

void setup() {
  pinMode(9, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(2, INPUT_PULLUP);
  pinMode(1, INPUT_PULLUP);

  lcd.init();
  lcd.backlight();
  lcd.clear();
}

void loop() {
  if (digitalRead(7) == 0) {
    a++;
    digitalWrite(6, HIGH);
    delay(500);
    lcd.setCursor(0, 0);
    lcd.print("Nomor Antrian "); lcd.print(a);

    lcd.setCursor(0, 1);
    lcd.print("Silahkan Menuju ke loket 1");
    delay(200);
    digitalWrite(6, LOW);
    delay(100);
    for (i = 0 ; i < 40; i++) {
      lcd.scrollDisplayLeft();
      delay(200);
    }
  }

  if (digitalRead(8) == 0) {
    a++;
    digitalWrite(9, HIGH);
    delay(500);
    lcd.setCursor(0, 0);
    lcd.print("Nomor Antrian "); lcd.print(a);

    lcd.setCursor(0, 1);
    lcd.print("Silahkan Menuju ke loket 2");
    delay(200);
    digitalWrite(9, LOW);
    delay(100);
    for (i = 0 ; i < 40; i++)
    {
      lcd.scrollDisplayLeft();
      delay(200);
    }
  }
}