#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

uint8_t smiley[8] = {
  0b00000,
  0b01010,
  0b00000,
  0b00100,
  0b00100,
  0b10001,
  0b01110,
  0b00000,
};

void setup() {
  lcd.init();
  lcd.backlight();
  lcd.createChar(1, smiley);
  lcd.begin(16, 2);
}

int currentPosition = 0;

int flag = 1;

void loop() {
  if (flag) {
    flag = 0;
    lcd.setCursor(24,0);
    lcd.print("Hello world! \x01");
  }

  currentPosition++;
  if (currentPosition == 40) {
    lcd.clear();
    lcd.setCursor(24,1);
    lcd.print("Hello world! \x01");
  }
  if (currentPosition == 80) {
    lcd.clear();
    lcd.setCursor(24,0);
    lcd.print("Hello world! \x01");
    currentPosition = 0;
  }
  lcd.scrollDisplayRight();
  delay(100);
}