Keyboard Builders' Digest
Redeem $5 at PCBWay! Code: KBDNEWS [all coupons]
Keyboard Builders' Digest / Tools

0xCB Pluto

0xCB Pluto is a Pro Micro compatible controller designed by u/0xCB-dev.
Published May 10, 2022

0xCB Pluto, this new development board by 0xCB, is not just Pro Micro compatible but also has all 25 pins of the ATmega32U4 broken out, just like D- and D+.

Teased by Conor in January, the first samples are out for testing, and the files of the Pluto have been published this week too.

  • electrically and physically compatible with the standard Pro Micro
  • exposing all 25 available pins
  • D- and D+ broken out too
  • featuring USB C
  • flatter design for tight builds (mid-mount connector)
  • pre-flashed with the QMK DFU bootloader
  • open-source

D- and D+ broken out makes it possible to easily use it with e.g. the unified USB daughterboard.

We do plan on selling it in the future. Just want to get the hype going a bit. ;) […] We will offer them for EU only. But we are in the talks with a vendor in the US. He ships worldwide... – 0xCB-dev

KiCAD and Gerbers files available in this GitHub repo:

Btw, 25 pins mean 600 switches handled by a single controller board (see the square matrix). :D Just tellin'…

For those who understand German, Jacob and Conor, founders of 0xCB, talk about their startup and mechanical keyboards in general in Trommelspeicher/Das Duumvirat podcast:

#DD #045 – Vom Hobby zum Startup

Published on Tue 10th May 2022. Featured in KBD #78 (source).

Did you like reading this post?

Donate to keep this project alive


USB-C Pro Micro issues

Difference in routing of some USB-C Pro Micro clones reported by hellmoneywarriors.

Waterproofing a nice!nano

ELr3ddit applied a silicone coating to an exposed nice!nano to make it waterproof.

Free prototype PCBs from Seeed

Seeed Studio is running a sponsorship campaign of the Seeed Fusion Assembly service offering free PCB prototypes for DIY keyboard projects with a XIAO RP2040 controller included.

TinyS3 controller

UnexpectedMaker's TinyS3 is a development board featuring the ESP32-S3 controller, and offering both wired and wireless connection.


The RP2040-Zero is a tiny RP2040 based controller with USB-C and 20(+9) GPIO pins.

Key Micro RP

The key micro RP offered by abitkeys is another RP2040-based controller with some extras.