#include <LiquidCrystal_I2C.h>

const uint8_t I2C_ADDRESS = 0x27;
const uint8_t LCD_COLUMNS = 20;
const uint8_t LCD_ROWS    = 4;

LiquidCrystal_I2C lcd(I2C_ADDRESS, LCD_COLUMNS, LCD_ROWS);

void setup() {
  lcd.init();
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Welcome!");
}

void loop() {}