#include <LiquidCrystal_I2C.h>


int lcdcolumns = 16;
int lcdrows = 2;


LiquidCrystal_I2C lcd(0x27,lcdcolumns, lcdrows);


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

}

void loop()
{
  lcd.setCursor(0,0);
  lcd.print("hello, world!");
  delay(1000);

lcd.clear();
lcd.setCursor(0,1);
lcd.print("hello, world !");
delay(1000);
lcd.clear();

}