int led = 13;
int btn = 12;

bool stavTlacidla = HIGH;
bool negovanyStavTlacidla = LOW;

bool stavLed = LOW;

bool lastBtnState = LOW;

void setup() {
  // put your setup code here, to run once:

  pinMode(led, OUTPUT);
  pinMode(btn, INPUT_PULLUP);

  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  stavTlacidla = digitalRead(btn);
  negovanyStavTlacidla = !stavTlacidla;
  Serial.println(negovanyStavTlacidla);
  delay(200);

  if(negovanyStavTlacidla == HIGH && lastBtnState == LOW){
    stavLed = !stavLed;
  }

  lastBtnState = negovanyStavTlacidla;

  if(stavLed == HIGH){
    digitalWrite(led, HIGH);
  }else{
    digitalWrite(led, LOW);
  }
  
  
  //Serial.println(!digitalRead(btn));
}