Ahoj akurat mi dorazilo arduino. potreboval by som poradit ked nahram uvodny kod pre lcd ,, tak lcd len raz blikne ale text nezobrazí

#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4); // set the LCD address to 0x20 for a 16 chars and 2 line display

void setup()
{
lcd.init(); // initialize the lcd

// Print a message to the LCD.
lcd.backlight();
lcd.print("Hello, world!");
}

void loop()
{
}