uint32_t prev_time;

void setup() {

#ifdef __AVR_ATtiny85__ // Trinket, Gemma, etc.

  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();

  uint32_t t = millis();

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

    mode = random(0, 9);

    prev_time = t;

  }

}

void RingsComplete()

{

  uint16_t slow_interval = random(SLOW_INTERVAL_MIN, SLOW_INTERVAL_MAX + 1);

  uint32_t color = Rings.Wheel(random(COLOR_MIN, COLOR_MAX + 1));

  switch (mode) {

    case 0:

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

      break;

    case 1:

      Rings.ColorWipe(color, slow_interval);

      break;

    case 2:

      Rings.DoubleColorWipe(color, slow_interval);

      break;

    case 3:

      Rings.Scanner(color, slow_interval);

      break;

    case 4:

      Rings.DoubleScanner(color, slow_interval);

      break;

    case 5:

      Rings.Random(color, steps, slow_interval);

      break;

    case 6:

      Rings.DoubleRandom(color, steps, slow_interval);

      break;

    case 7:

      Rings.Blink(color, steps, random(BLINK_MIN_INTERVAL, BLINK_MAX_INTERVAL + 1));