Two WS2812B strings with the same pixel address

Issues
1

I’ve bought two of WS2812B strings (Christmas set 100 leds / 10m) from BTF-Lightning, these ones:

First I connected sigle string (100 leds) do wemos D1 Mini, 5V/4A power supply directly to string. WLED works very good. Then I connected second string to the end of first one, to make daisy chain (christmas tree chain). Power injected in middle. So I got 200 pixels chain. I setup “length=200”, lit up first pixel in UI and…first and 101th was lit up! When Iit up first three in UI then first three and 101-103 pixels were lit up.
When I setup “length=100” it was the same. So it looks like my WS2812B pixels have some sort of “hardcoded address/index”, from 0 to 99. It looks like second string just mirrors first one!

Have you ever seen that? Is it any workaround to get nice daisy chain of 200 leds?

2

That effect on cheaper strings has been noted a number of times.
The solution with WLED is to drive the strings on different output pins.
See kno.wled.ge

1 Like
3

Thanks a lot. Let it be a warning about Christmas strings from Btf-lighting.

4

Very strange , the guys were recommending BTF-lighing and I got multiple strips and matrices and they all worked very well and all the problems were related to setting and wiring .

If this is an issue with this specific type then why not ask for refund . I did request return for a damaged leds and BTF give me a refund and they let me keep the leds . try it if you got it from amazon it should be easy