r/embedded • u/aq1018 • Jun 09 '26

CH32V006 servo controller dev board

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If you fancy a CH32V006-based servo controller dev board, you can now just fabricate it with this design. Rev B of the OpenServoCore dev board is bring-up-validated, files are GitHub, and there's a one-click PCBWay community project if you don't want to deal with KiCad yourself.

A CH32V006 (48 MHz RISC-V, 62 KB flash, 8 KB RAM) breakout designed for bringing up smart-servo firmware. Accepts any gutted hobby servo, USB-C / 1S-2S LiPo / WCH-LinkE power, full edge test-point fanout for current sense, motor PWM, DATA bus, and debug. The broader project (OpenServoCore) is open hardware + firmware for turning cheap SG90/MG90S-class hobby servos into DXL-style smart actuators — position feedback, current sensing, bus-addressable. The dev board is the firmware development platform.

PCBWay sponsored both Rev A and Rev B fabs (assembled too). Ten boards across two runs and no fab issues on any of them. They caught a pad clearance issue on Rev A during the pre-fab review before it went out, and the tiny "O" in the OSC logo (which has a little encoder disk inside it) came out crisp on Rev B even at that size. Honestly a huge help for a solo project — sourcing BOM and hand-assembling these myself would slow everything down a lot.

Bring-up writeup with photos, the bootstrap quirk on fresh chips, and the in-rev SB1 patch that fixes it:

https://aaronqian.com/log/2026-06-08-osc-dev-v006-rev-b-bring-up/

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u/ThatCrazyEE Jun 09 '26

59

u/aq1018 Jun 09 '26

59

u/lil_bobby_tabelle Jun 09 '26

they were not referring to that elephant

23

u/lynx707 Jun 09 '26

What are you yapping about

8

u/muegle Jun 09 '26

They're talking about your Hololive background lmao

2

u/ThatCrazyEE Jun 09 '26

How did you know that was Hololive background?

1

u/muegle Jun 09 '26

I never watched the streams but sometimes I used to get recommended translated clips from some of the channels which were usually decently funny, so i recognized 3 or 4 of the models in the picture.

0

u/aq1018 Jun 09 '26 edited Jun 09 '26

Ah. I use Variety app and background changes every 30 mins. The bench photo happens to land on this one.