About Theatre Chase effect on LED strip with WS2812b


I imitate theatre chase sample code in the Tweaking4All website on my LED strip, but the effect of my The light strip becomes a stroboscopic effect instead of Theatre Chase effect.

my code is as follows:

void theaterChase(uint8_t red, uint8_t green, uint8_t blue, int SpeedDelay) 
  for (int j=0; j<10; j++) 
  {  //do 10 cycles of chasing
    for (int q=0; q < 3; q++) {
      for (int i=0; i < LED_FRAME_SIZE; i=i+3) {
        setPixel(i+q, red, green, blue);    //turn every third pixel on
      for (int i=0; i < LED_FRAME_SIZE; i=i+3) {
        setPixel(i+q, 0,0,0);        //turn every third pixel off

the LED_FRAME_SIZE is all LEDs in my LED strip.

I also upload my LED strip video on youtube. (LED strip effect demo - YouTube)

Please guide me what's wrong on my code.


Why do users choose to ignore the advice on posting code ?

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Why would they need to read the instructions? :roll_eyes:

So in both these for-loops, you skip 2 leds. Is that intentional?

Shouldn't you be also doing that after turning pixels off?

Also asked here: https://www.tweaking4all.com/forum/arduino/about-theatre-chase-effect-on-led-strip-with-ws2812b/.

The Tweaking4All Theatre Chase in Wokwi simulation: https://wokwi.com/arduino/projects/301459608054006282

The problem is often a weak power supply, or a missing capacitor at the first led, or a signal that is too low (from a ESP8266 for example). Does it work with a normal delay() ?

Hi Koepel,

I also found the output voltage is too low (about 3.xV) normal is 4.5V~5V , so I will debug first.

Thanks for the information.

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