int led_3=3; //led dioda mora biti spojena na PWM
int tipkalo_4=4;
int tipkalo_5=5;
int tipkalo_6=6;
int brojac=0;
void setup() {
  // put your setup code here, to run once:
pinMode(led_3, OUTPUT);
pinMode(tipkalo_4, INPUT_PULLUP);
pinMode(tipkalo_5, INPUT_PULLUP);
pinMode(tipkalo_6, INPUT_PULLUP);
digitalWrite(led_3, LOW);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
 if(digitalRead(tipkalo_4)==LOW)
 {
   brojac=brojac+5;
    //naredba analogWrite nam prikazuje preko PMW modulacije na diodi
   delay(50);
   if(brojac>255)
   {brojac=255;}
   Serial.println(brojac);
 }
 else if (digitalRead(tipkalo_5)==LOW)
{
  brojac=brojac-5;
   
   delay(50);
   if(brojac<=0)
   {brojac=5;}
   Serial.println(brojac);
}
else if (digitalRead(tipkalo_6)==LOW)
{
 brojac=0;
 
}
analogWrite(led_3, brojac); //izvršavanje naredbe ne radit
// u if-u nego na kraju analogWrite(led) napravit!!!!!!!
}