I have the same code running both a WS2811 and WS2801 set.

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I have the same code running both a WS2811 and WS2801 set. On the WS2811, some of my patterns aren’t quite right - e.g. a colour fade starts at the right colour but then is all white during the fade. Just to clarfy - it looks fine on the WS2801. What could be happening? Thanks in advance!

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There’s pretty much no information here that’d be helpful to actually figuring out what is going on, for example:

  • What branch/version of the library are you using?
  • What hardware are you running it on? (Arduino Uno, Due, Teensy 3, raw atmega328?)
  • What version of the arduino software are you using, and on what OS?
  • Can you post the code that you’re using for both cases to http://gist.github.com or http://pastebin.com?
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Yeah - sorry. I was just hoping it was a common mistake, and someone would go “ah, you’ve forgotten to blah…”

FastLED 3.1 / WS2801 on Due 1.5.8 / WS2811 on Mega 1.0.6

The code… well, there’s too much to post quickly. I’ll see what I can do, but if anyone has some thoughts in the meantime…

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Actually, I’ve already posted the code for a pattern that I get the problem with:

this will be the WS2801 version. the WS2811 won’t be SPI (obviously), so runs off pin 13

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So you have lots of wild differences in there between the two platforms - there’s a lot more changed than “just” the leds that you’re using (for example, the Due is a 32-bit arm platform while the mega is an 8 bit avr platform).

That said, make sure you have the latest version of FastLED 3.1 as i’ve been regularly tweaking the avr code (it’s a development, not a release branch after all) - and which arduino mega are you using, the 2560 based one?

Also - try using the released FastLED 3.0.3 branch and see if that changes things.