#include <TM1637Display.h>

#define CLK 2
#define DIO 3

unsigned long previousMillis = 0;
int cislo = 60;

TM1637Display display(CLK, DIO);

void setup() {
  display.setBrightness(7);
  display.showNumberDec(cislo, false);
}

void loop() {
  if(millis() - previousMillis >= 1000){
    previousMillis = millis();
    display.showNumberDec(cislo, false);
    cislo--;
  }

}