void rgbled(const byte Red, const byte Green, const byte Blue, const float SEC = 1)
{
  analogWrite(9, 255 - Red);
  analogWrite(10, 255 - Green);
  analogWrite(11, 255 - Blue);
  delay(SEC * 1000);
}

void setup()
{
  pinMode(2, INPUT);
  for (unsigned int i = 9; i <= 11; i++)
    pinMode(i, OUTPUT);
}

void loop()
{  
  if (digitalRead(2))
  {
      for (int i = 0; i <= 255; i++)
        rgbled(i, 0, 0, 0.02);
      for (int i = 255; i >= 0; i--)
        rgbled(i, 0, 0, 0.02);
  }
    
  else
  {
      rgbled(0, 0, 0);
}  }