int led = 7;
int button = 2;

void setup() {
  Serial.begin(115200);
  pinMode(button, INPUT_PULLUP);
  pinMode(led, OUTPUT);
}

void loop() {
  if(digitalRead(button) == LOW){
    digitalWrite(led, HIGH);
    Serial.println("Tipka pritisnjena.");
  }
  else{
    digitalWrite(led, LOW);
  }
}