Problems with drop in current

Fighting For Freedom

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Mar 9, 2026, 4:36:15 AMMar 9

to InMoov

Hi,

After I placed the Neopixelring, The Ultrasonic and PIR sensor the servo’s started to jitter

And I get error reports.

AI told me that’s a common problem which inmoov builders face frequently.

And that the Arduino’s loose their power and connection while the servo’s are draining the current.

AI advice me to put a big cap on both Nervo boards, and a smaller one 1000uf and ceramic 0,1uf cap and the problems will disappear.

Can you confirm this?

Regards, Marina

https://youtube.com/shorts/aytMbN6BCxM?is=lnHW1ZcjklMGXKZe

IMG_4191.jpeg

gael langevin

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Mar 9, 2026, 4:41:00 AMMar 9

to Fighting For Freedom, InMoov

Hello,

This issue is related to your USB Hub, because it cannot supply enough Amps to all your devices.

I use a powered hub on which all the devices are connected, arduino, camera, amplifier, etc...

You need a 4 Amps powered hub. (Don't trust AI about that big cap on both Nervo boards)

Gael Langevin

Creator of InMoov

InMoov Robot

@inmoov

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Marco Bolduc

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Mar 23, 2026, 1:22:42 PMMar 23

to InMoov

Never face that problem with servo but with motor controller yes. The big cap didn't fix for a simple reason, motor was draining it too. If this is really your problem, you need to put a diode to the line that supply power to your Arduino then you can add your big cap if still needed. That way cap will be able to keep Arduino voltage stable without getting drained by everything else.

But like Gael said I don't think this is your problem.

Fighting For Freedom

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Apr 6, 2026, 9:26:53 AMApr 6

to InMoov

Thank you for your advice!

Gael adviced me to use a 4 Amps powered hub, but he didn’t know I had already one at the time.

I Think It was a bad PIR connection, probably GND was poorly soldered.

I struggle a lot with soldering the boards…

To avoid the PIR connection, I use a Arduino Uno for the neopixelring and that works well now.

Btw AI found it very amuzing that Gael (the humanoid robot maker) told me not to trust AI About those big caps.

Regards, Marina

Op maandag 23 maart 2026 om 18:22:42 UTC+1 schreef aci...@gmail.com:

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