#include <TM1637Display.h>

#define CLK 2
#define DIO 3
#define BUZZER 4
#define TLACITKO 5

unsigned long previousMillis = 0;
int cislo = 10;
bool stav = true;

unsigned long lastDebounceTime = 0;
uint8_t debounceInterval = 50;
int buttonState = LOW;
int lastButtonState = LOW;


TM1637Display display(CLK, DIO);

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

void loop() {

  if(millis() - previousMillis >= 1000 && stav){
    previousMillis = millis();
    cislo--;
    display.showNumberDec(cislo, false);    
    if(cislo == 0){
      stav = false;
      tone(BUZZER, 262, 1000);
    }
  } 

  int reading = digitalRead(TLACITKO);

  if(reading != lastButtonState){
    lastDebounceTime = millis();
  }

  if((millis() - lastDebounceTime) >= debounceInterval){
    if(reading != buttonState) {
      if(buttonState == HIGH){
        // dokoncit
        stav = true;
        cislo = 10;
      }
    }
    buttonState = reading;
  }
}