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400khz pixels with GPIO

Started by benborden2, October 12, 2019, 01:41:49 PM

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How does one change the signal output frequency in falcon pi player?

I am running WS2811's directly out of GPIO on the RPi0W.  When I hook up 800khz pixels it works just fine but when I switch to an older set that requires 400khz they do not light up.  I know the pixels work because I have a python script that runs them just fine at 400khz, however I am trying to switch to Falcon Player so that I can sync them with my other Pi.


Are you running the pixels direct from the output or are there other pixels in the same string? Worldsemi who make the WS2811 in their infinite wisdom changed the specs of WS2811 a few years ago and it led to a compatibility issue. If you put old pixels prior to new pixels everything works fine. If however you put new pixels prior to old ones all the old ones will stay turned off. I think I'm remembering the order correctly. It's either that way or the reverse and it's highly frustrating. Generally a pixel controller can drive both vintages fine but because each pixel regenerates the timing it only takes 1 "wrong" pixel to stop data transmission.


The string I am having trouble with is just old pixels.  I haven't tried putting both kinds together because I didn't expect it to work.  It is nice to know that I might be able to put them together however, the old ones currently don't work by themselves.

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