void rgbToHSV(double r, double g, double b, double hsv[]) {
  double computedH, computedS, computedV;
 double minRGB, maxRGB;
 double d = 0, h = 0;

  r = r/1023; g = g/1023; b = b/1023;
  minRGB = min(r,min(g,b));
  maxRGB = max(r,max(g,b));

  if (minRGB == maxRGB) {
    // Black-gray-white
    computedV = minRGB;
    hsv[0] = 0; hsv[1] = 0; hsv[2] = computedV;
  } else {
    // Colors other than black-gray-white:
    d = (r == minRGB) ? g-b : ((b == minRGB) ? r-g : b-r);
    h = (r == minRGB) ? 3 : ((b == minRGB) ? 1 : 5);

    computedH = 60*(h - (d/(maxRGB - minRGB)));
    computedS = (maxRGB - minRGB)/maxRGB;
    computedV = maxRGB;

    hsv[0] = computedH; hsv[1] = computedS; hsv[2] = computedV;
  }
}