#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2); // I2C address 0x27, 16 column and 2 rows

byte customChar[8] = {
  0b00100,
	0b00100,
	0b00100,
	0b01110,
	0b01110,
	0b01110,
	0b01110,
	0b11111
};

int Pozicia = 0;
int Smer = 1;

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

  lcd.createChar(0, customChar); // create a new custom character

  lcd.setCursor(0, 0); // move cursor to (2, 0)
  lcd.write((byte)0);  // print the custom char at (2, 0)
}

void loop()
{
for(int i=0;i<=16;i++){
  if( i == Pozicia){
  lcd.setCursor(i, 0);
  lcd.write((byte)0); 
  delay(500);
}
else{
  lcd.setCursor(i, 0);
  lcd.print(" "); 
}
}
Pozicia += Smer;
if(Pozicia>=15 || Pozicia<=0){
  Smer *= -1;
}
}