int SinTaster = 3;
int ZelenTaster = 4;
int SinLed = 9;
int ZelenLed = 10;
int CrvenLed = 11;
int Zvucnik = 13;

int VredSinTaster;
int VredZelenTaster;
int LedBoja;

int pauza = 200;

void setup() {
  pinMode (SinTaster, INPUT);
  pinMode (ZelenTaster, INPUT);
  pinMode (SinLed, OUTPUT);
  pinMode (ZelenLed, OUTPUT);
  pinMode (CrvenLed, OUTPUT);
  pinMode (Zvucnik, OUTPUT);
  Serial.begin (9600);
}

void loop() {
  VredSinTaster = digitalRead (SinTaster);
  VredZelenTaster = digitalRead (ZelenTaster);
  Serial.print ("SinTaster = ");
  Serial.print (VredSinTaster);
  Serial.print (" , Zelentaster = ");
  Serial.print (VredZelenTaster);
  Serial.print (" , LedBoja = ");
  Serial.println (LedBoja);
  
  if (VredSinTaster == 1) {
    LedBoja = LedBoja - 1;
  }
  if (LedBoja < 0) {
    LedBoja = 0;
    digitalWrite (Zvucnik, HIGH);
  }
  if (VredZelenTaster == 1) {
    LedBoja = LedBoja + 1;
  }
  if (LedBoja > 7) {
    LedBoja = 7;
    digitalWrite (Zvucnik, HIGH);
  }
  if (LedBoja == 0) {
    analogWrite (CrvenLed, 0);
    analogWrite (ZelenTaster, 0);
    analogWrite (SinLed, 0);
  }
  if (LedBoja == 1) {
    analogWrite (CrvenLed, 0);
    analogWrite (ZelenTaster, 0);
    analogWrite (SinLed, 255);
  }
  if (LedBoja == 2) {
    analogWrite (CrvenLed, 255);
    analogWrite (ZelenTaster, 0);
    analogWrite (SinLed, 255);
  }
  if (LedBoja == 3) {
    analogWrite (CrvenLed, 255);
    analogWrite (ZelenTaster, 0);
    analogWrite (SinLed, 0);  
  }
  if (LedBoja == 4) {
    analogWrite (CrvenLed, 255);
    analogWrite (ZelenTaster, 255);
    analogWrite (SinLed, 0);  
  }
  if (LedBoja == 5) {
    analogWrite (CrvenLed, 0);
    analogWrite (ZelenTaster, 255);
    analogWrite (SinLed, 0);  
  }
  if (LedBoja == 6) {
    analogWrite (CrvenLed, 0);
    analogWrite (ZelenTaster, 255);
    analogWrite (SinLed, 255);  
  }
  if (LedBoja == 7){
    analogWrite (CrvenLed, 255);
    analogWrite (ZelenTaster, 255);
    analogWrite (SinLed, 255);  
  }

  delay (pauza);
}