int led=3;
int plus=5; //zelena
int minus=6; //crvena
int reset=9; //crna
int sepe=10; //plava
int i=0;

void setup() {
  // put your setup code here, to run once:
pinMode(led, OUTPUT);
pinMode(plus, INPUT_PULLUP);
pinMode(minus, INPUT_PULLUP);
pinMode(reset, INPUT_PULLUP);
pinMode(sepe, INPUT_PULLUP);
digitalWrite(led, LOW);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  if(i>=0 && i<=255)
  {
    if(digitalRead(plus)==LOW && i<254)
{
  
  i=i+5;
  analogWrite(led,i);
  Serial.println(i);
}
 if(digitalRead(minus)==LOW && i>2)
{
  
i=i-2;
  analogWrite(led,i);
  Serial.println(i);
}
 if(digitalRead(reset)==LOW)
{
  
  analogWrite(led,0);
  i=0;
}
 if(digitalRead(sepe)==LOW)
{
  i=191;
  analogWrite(led,i);
}
}

  }