int LED_utrip = 500; //utripanje na 500 ms
unsigned long changeTime;
bool m = HIGH; 


void setup() {
  DDRD = 0xFF;
}

void loop() {
  if ((millis() - changeTime) > LED_utrip) {
    m = !m;
    changeTime = millis();
  }

  if (m == HIGH) {
    // (lahko tudi to)
    //PORTD = (1<<PD0) | (1<<PD3) | (1<<PD6);
    PORTD = 0x49;
  }

  if (m == LOW) {
    PORTD = (0<<PD0) | (0<<PD3) | (0<<PD6);
  }


  //PORTD |= B00000100;
  //delay(500);
  //PORTD |= B00000100;
  //delay(500);

  //PORTD = (1<<PD0) | (1<<PD3) | (1<<PD6);
  //delay(500);
  //PORTD = (0<<PD0) | (0<<PD3) | (0<<PD6);
  //delay(500);
}