int vhod;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  DDRD &= 0b00000000;//postavitev na nič; | postavitev na 1
}

void loop() {
  vhod = PIND & 0b11100000;
  switch(vhod){
    case 0b10000000: { 
      Serial.println("Pritisnjena je tipka RED");
      break;
    }
    case 0b01000000: { 
      Serial.println("Pritisnjena je tipka GREEN");
      break;
    }
    case 0b00100000: { 
      Serial.println("Pritisnjena je tipka BLUE");
      break;
    }
  }
  delay(500);
}