Variação de Matiz com LED RGB e Arduino

LED_RBG.cpp

#define bPin 9
#define gPin 10
#define rPin 11
  
int r, g, b;
int hue;
  
void setup() {
  pinMode(rPin, OUTPUT);
  pinMode(gPin, OUTPUT);
  pinMode(bPin, OUTPUT);
}

void loop() {
  for(int hue = 0; hue < 255; hue += 4) {
    HSBToRGB(hue, 255, 255, &r, &g, &b);
    analogWrite(rPin, r);
    analogWrite(gPin, g);
    analogWrite(bPin, b);
    delay(10);
  }
}

void HSBToRGB( int inHue, int inSaturation, int inBrightness, int *oR, int *oG, int *oB ) {
  if( inSaturation == 0) {
    //achromatic (grey)
    *oR = *oG = *oB = inBrightness;
  } else {
    unsigned int scaledHue = (inHue * 6);
    unsigned int sector = scaledHue >> 8; // sector 0 to 5 around the color wheel
    unsigned int offsetInSector = scaledHue - (sector << 8);	// position within the sector
    unsigned int p = (inBrightness * ( 255 - inSaturation )) >> 8;
    unsigned int q = (inBrightness * ( 255 - ((inSaturation * offsetInSector) >> 8) )) >> 8;
    unsigned int t = (inBrightness * ( 255 - ((inSaturation * ( 255 - offsetInSector )) >> 8) )) >> 8;

    switch( sector ) {
      case 0:
        *oR = inBrightness;
        *oG = t;
        *oB = p;
      break;
      case 1:
       *oR = q;
       *oG = inBrightness;
       *oB = p;
      break;
      case 2:
        *oR = p;
        *oG = inBrightness;
        *oB = t;
      break;
      case 3:
        *oR = p;
        *oG = q;
        *oB = inBrightness;
      break;
      case 4:
        *oR = t;
        *oG = p;
        *oB = inBrightness;
      break;
      default:		// case 5:
        *oR = inBrightness;
        *oG = p;
        *oB = q;
      break;
    }
  }
}