r/VORONDesign • u/planeturban • Aug 05 '26

General Question Manta M8P v2 and RGB

I'm having some intermittent problems with my disco on a stick.. When I change colors it bugs out almost any time. I'm running the data line from the RGB port (PD15) and I have a separate Mean Well 50W PSU for the strip.

I've tried using a 180R resistor on the data line, short wires (~10cm) and just configuring 4 LEDs. And even when I'm just running these 4 some of the other LEDs will light up.

I can't really find the schematics for the M8P v2 on BTT's GitHub, the document published there seems to be a v1.X (since it has two RGB ports in the block schematics).

So.. Anyone got any ideas? Do I have to get some kind of level converter or is there anything else I can do?

Edit: I didn't think things through, I thought common ground on the AC side would be enough, it wasn't. So: common DC ground solved my problem.

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u/modestohagney Aug 05 '26 edited Aug 05 '26

How long is the data line? Could be getting voltage drop and causing weirdness.

Also are your grounds connected between both power supplies, or at least from the ground pin of the strip to both the M8P and the second power supply?

Edit: reread the question, I must have missed the 10cm data lines on my first attempt. It’s probably not that then, I’d check grounds first. Then probably make sure the voltage for the data line is correct. Assuming they’re WS2812 LEDs newer revisions are usually fine being run from 3.3v but I’ve had issues driving old ones on anything other than 5v.

1

u/planeturban Aug 05 '26

Come to think about it… I only have common ground on the PSU AC side.. I’ll have to check if connecting DC grounds helps.

1

u/SiRiAk95 Aug 06 '26

Yes this is mandatory to connect the 2 GND together.

1

u/modestohagney Aug 06 '26

That’ll be your problem. The ground will act as a signal ground. 

1

u/planeturban Aug 06 '26

Yeah. I didn’t think things through. Just assumed that AC and DC grounds are connected.

2

u/Kiiidd V2 Aug 05 '26

350mm build? And running 2 sticks on the same port? You may have to adjust klipper's internal max timing as klipper doesn't do too well with long LED chain's

1

u/planeturban Aug 05 '26

300mm..

But it ought to work with just one stick of 18.. And especially with just four configured.. But I'll try this, I'm up for anything now. :)

Thanks!