int rot = 11;
int gruen = 10;
int blau = 9;

void setup()
{
  pinMode(rot, OUTPUT);
  pinMode(gruen, OUTPUT);
  pinMode(blau, OUTPUT);  
}

void loop()
{


  for (int i= 1; i< 4; i=i+i) { 
    setColor(255,100,0);
    delay(50);
    setColor(0,0,0);
    delay(50);
  }
  
    for (int i= 1; i< 4; i=i+i) { 
    setColor(255,100,0);
    delay(250);
    setColor(0,0,0);
    delay(250);
  }
  
   for (int i= 1; i< 4; i=i+i) { 
    setColor(255,100,0);
    delay(50);
    setColor(0,0,0);
    delay(50);
  }

}

void setColor(int r, int g, int b)
{

  analogWrite(rot, r);
  analogWrite(gruen, g);
  analogWrite(blau, b);  
}