int r = 9;
int g = 10;
int b = 11;
void setup() {
  pinMode(r, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(b, OUTPUT);
}

void loop() {
  for(int i=0;i<255;i++){
    color(i,10,10);
    delay(10);
  }
  for(int i=255;i>0;i--){
    color(i,10,10);
    delay(10);
  }
}

void red(){
  digitalWrite(r,1);
  digitalWrite(g,0);
  digitalWrite(b,0);
}

void color(int rr,int gg ,int bb){
  analogWrite(r,rr);
  analogWrite(g,gg);
  analogWrite(b,bb);
}