#include <Bounce2.h>
#define btnRed 5
#define btnGreen 4
#define btnBlue 3
#define btnYellow 2
int stevec;
Bounce2::Button tipka1, tipka2, tipka3, tipka4 = Bounce2::Button();

volatile byte stanje = LOW;
volatile bool m;
unsigned long timePass;
int timeDelay = 500;
int ledPin = 8;

void setup() { 
    tipka1.attach(btnRed, INPUT_PULLUP);
    tipka2.attach(btnGreen, INPUT_PULLUP);
    tipka3.attach(btnBlue, INPUT_PULLUP);
    tipka1.interval(10);
    tipka2.interval(10);
    tipka3.interval(10);
  tipka1.setPressedState(LOW);
  tipka2.setPressedState(LOW);
  tipka3.setPressedState(LOW);
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
  pinMode(btnYellow, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(btnYellow), ISR_prekinitev, FALLING);
}

void loop() {
  tipka1.update();
  tipka2.update();
  tipka3.update();

  if(tipka1.pressed()){
    stevec++;
    Serial.println(stevec);
  }

  if(tipka2.pressed()){
    stevec--;
    Serial.println(stevec);
  }

  if(tipka3.pressed()){
    stevec = 0;
    Serial.println(stevec);
  }

  if (stanje == HIGH && ((millis() - timePass) > timeDelay)){
    digitalWrite(ledPin,stanje);
    stanje = LOW;
    timePass = millis();
  }
}

void ISR_prekinitev(){
  stanje = HIGH;
}