else if (WheelPos < 170) {

        WheelPos -= 85;

        return Color(0, WheelPos * 3, 255 - WheelPos * 3);

      }

      else {

        WheelPos -= 170;

        return Color(WheelPos * 3, 255 - WheelPos * 3, 0);

      }

    }

    void ColorSet(uint32_t color) {

      for (int i = 0; i < numPixels(); i++) {

        setPixelColor(i, color);

      }

    }

};

void RingsComplete();

NeoPatterns Rings(32, PIN, NEO_GRB + NEO_KHZ800, &RingsComplete);

uint8_t mode = 0;

uint32_t prev_time;

void setup() {

  if (F_CPU == 16000000) clock_prescale_set(clock_div_1);

#endif

  Rings.begin();

  Rings.setBrightness(BRIGHTNESS);

  Rings.RainbowCycle(random(RAINBOW_CYCLE_MIN_INTERVAL, RAINBOW_CYCLE_MAX_INTERVAL + 1));

  prev_time = millis();

}

void loop() {

  Rings.Update();

  /*

     We could store the return of the first millis call in a variable.

     But this routine is fast, so we only loose some milliseconds (if even)

     and we are not that time critical, that the MODE changes extacly after

     MODE_CHANGE_TIME. Calling millis twice, saves us 8 bytes, which is critical

     for the small storage space we have.

  */

  if ((millis() - prev_time) >= MODE_CHANGE_TIME) {

    mode = random(0, 9);

    prev_time = millis();

  }

}

void RingsComplete() {