int test = 0;

int cislo = 0;


long buducnost = 0;



void setup() 
{

  pinMode(A5, INPUT_PULLUP);
  Serial.begin(9600);

  pinMode(8, OUTPUT);
}

void loop() 
{

  if(millis() >= buducnost)
  {
    if(digitalRead(8) == HIGH)
      digitalWrite(8, LOW);
    else
      digitalWrite(8, HIGH);

    buducnost = millis() + 500;
  }


  if(digitalRead(A5) == LOW && test == 0)
  {

    test = 1;
    cislo++;
    Serial.println(cislo);


  }

  else if(digitalRead(A5) == HIGH && test == 1)
  {

    test = 0;
  }

}