RGB_LED_Experiment

int redPin = 11;
int greenPin = 10;
int bluePin = 9;

void setup()
{
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
}

void loop()
{
  for(int hue = 0; hue < 360; hue++)
  {
    setColorHSV(hue, 1, 1);
    delay(10);
  }
}

void setColorRGB(int red, int green, int blue)
{
  analogWrite(redPin, red);
  analogWrite(greenPin, green);
  analogWrite(bluePin, blue);
}

void setColorHEX(unsigned long color)
{
  byte redInt = (color >> 16) & 0xFF;
  byte greenInt = (color >> 8) & 0xFF;
  byte blueInt = color & 0xFF;
  setColorRGB(redInt, greenInt, blueInt);
}

void setColorHSV(int hue, double sat, double val)
{
  double r = 0;
  double g = 0;
  double b = 0;

  double hf = hue/60.0;

  int i = (int)floor(hue/60.0);
  double f = hue/60.0 -i;
  double pv = val * (1-sat);
  double qv = val * (1-sat * f);
  double tv = val * (1-sat * (1-f));

  switch(i)
  {
    case 0:
      r = val;
      g = tv;
      b = pv;
      break;
    case 1:
      r = qv;
      g = val;
      b = pv;
      break;
    case 2:
      r = pv;
      g = val;
      b = tv;
      break;
    case 3:
      r = pv;
      g = qv;
      b = val;
      break;
    case 4:
      r = tv;
      g = pv;
      b = val;
      break;
    case 5:
      r = val;
      g = pv;
      b = qv;
      break;
    case 6:
      r = val;
      g = tv;
      b = pv;
      break;
    case -1:
      r = val;
      g = pv;
      b = qv;
      break;
    default:
      r = g = b = val;
      break;
  }

  int red = constrain((int)255 * r, 0, 255);
  int green = constrain((int)255 * g, 0, 255);
  int blue = constrain((int)255 * b, 0, 255);

  setColorRGB(red, green, blue);
}