#include <LiquidCrystal_I2C.h>  // lib-version 1.1 (Schwartz)
LiquidCrystal_I2C lcd(0x20,20,4); // adress, signs per line, lines 

void setup() {
  lcd.init();  lcd.backlight();
  lcd.setCursor(0, 1); // 2.sign, upper line
  lcd.print("short Test!");  delay(300); 
}

void loop() {
  lcd.setCursor(0, 0); // 2.sign, upper line
  lcd.print( millis()/ 100 ); lcd.print( "  "); 
}