Add warning to LED Preferences

[netmindz]

Add text when adding a second bus that might have flickering issues

[blazoncek]

I thought about this and I think I do not like it.
It would be like putting a note on your car's dashboard "WARNING: Pressing a brake may cause your car to skid instead of stop if you drive faster than 50 km/h."

We should either make a car stop when pressing a brake or not go faster than 50 km/h.

As most users use 8 or less outputs it might be worth experimentin with using parallel I2S always if not using >700 LED (a recommended length) on a single bus and using the same digital LED type. Unfortunately that will not solve mixed LEDs and several outputs.

I think we should add Q&A page to our KB where we can elaborate on flickering issues (including level shifters and issues with RMT buffers).

[DedeHai]

I think we should add Q&A page to our KB where we can elaborate on flickering issues (including level shifters and issues with RMT buffers).

That was the Idea behind my proposal to add that warning: add a link to KB explaining it in more detail.
I see two options:

• delay the release and properly fix it (as mentioned: efforts are better spent on 0.16)
• release as-is and add the warining/info to config page to mitigate user frustration if they do get flickering

[wled-compile]

Hi together, for someone like me who is not that involved into discussion before, maybe one of you can tell what is correct and what is not and answer one question:

1. Using WLED Version >=0.15.0 might cause sometimes flickering when more than one LED strip is connected
2. The root cause is not completely understood now
3. The issue is when RMT method is used
4. Using parallel I2S method can prevent flickering. Currently limited to 300 LEDs/strip, PR to extend to 600 LEDs is on the way
5. ParalellI2S was introduced in 0.15.1-beta2
6. ParallelI2S can only be used when all LED strips have the same timings
7. To enable parallelI2S method, the respective setting “Use parallel I2S” in LED settings must be checked.
8. Question: The checkbox only appears when 3 or more LED strips configured. Why not if already 2 strips configured?

[netmindz]

I think you have surmised the issue correctly @wled-compile except perhaps for the 5th point, as this is a bug-fix rather than feature release

[wled-compile]

@netmindz OK thank you!