#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2); //nastaveni pinu

long lastTime = 0;

void setup() {
    lcd.begin(20, 4); //inicializace displeje
    
    lastTime = millis();
}

void loop() {
    if(millis()-lastTime > 1000){
        lcd.clear();
        lcd.setCursor(9,1);
        lcd.print(millis()/1000);
        
        lastTime = millis();
    } 
}