#include <LiquidCrystal_I2C.h>
#define LCD_ADDR 0x27 
#define LCD_COLUMNS 27 
#define LCD_ROWS 4

LiquidCrystal_I2C lcd(LCD_ADDR,LCD_COLUMNS,LCD_ROWS);
void setup() {
  // put your setup code here, to run once:
lcd.begin(27,4);
lcd.init();
lcd.backlight();
lcd.setCursor(1,0);
lcd.print("Xin chao!");
}

void loop() {
  // put your main code here, to run repeatedly:

}