ArduinoLedBtn.ino

int tlac = 8;
int led = 9;
int stav = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(led, OUTPUT);
  pinMode(tlac, INPUT_PULLUP);
}

void loop() {
  // put your main code here, to run repeatedly:
  stav = digitalRead(tlac);

  if (stav == HIGH)
  { 
    digitalWrite(led, HIGH);
  }
  else 
  {
    digitalWrite(led, LOW);
  }
}