#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2); // set the LCD address to 0x3F for a 16 chars and 2 line display

void setup()
{

}

void loop()
{
lcd.init(); // initialize the lcd
// Print a message to the LCD.
lcd.backlight();
lcd.setCursor(0,0);
lcd.print("udalo sie");
lcd.setCursor(0,1);
lcd.print("Zadanie wykonane");
delay(2000);
lcd.clear();
lcd.setCursor(0,0);
lcd.print("znow");
lcd.setCursor(0,1);
lcd.print("ponownie");
}