Keyboard Builders' Digest
5% off of the LEGO compatible Adam by KBDcraft! (Code: KBDNEWS)
Keyboard Builders' Digest / Projects

Cantaloupe V2.0

The Cantaloupe V2.0 is a reversible open-source ergo split keyboard by u/BucketInABucket with on-board ARM processor.
Published January 21, 2022

An open-source 60% QMK-compatible split ergo keyboard.

My next iteration of my personal split keyboard called the Cantaloupe – BucketInABucket.

The layout is based on the Ergodash layout with the inner-most keys removed and an improved thumb cluster. (The layout was only used as a reference, the board is a completely new design.)

Plenty of design cues have been taken from the YAEMK for version 2.0, especially with regards to the microprocessor section and the way that keyboard implements a fully reversible design.


  • 30-key layout, pinky stagger, arrow keys.
  • On-board ARM (changed to STM32F4x1CxUx: F401 and F411 both compatible) processor
  • Kailh hot-swap
  • USB-C input and split connect ports with full ESD protection.
  • 0.96" OLED
  • Rotary encoder and Pimoroni trackball (replacing one encoder).
  • Reversible design which means lower PCB cost.
  • JTAG/SWD breakout header for an alternate means of programming the board.

GitHub repo:

Published on Fri 21st Jan 2022. Featured in KBD #62 (source).

Did you like reading this post?

Donate to keep this project alive


Project Mammoth

A successor to the elephant42, 🦣 by @illness072 is on a whole new level in many ways.


ErgoChoco is a well-documented open-source pseudosplit build by Choco617.


Based on Pseudoku's Hypo Warp, D-Warp is a 3D-printed split by u/Darrenph1 with a quite rare thumb key arrangement.


Timothy is a tented split keyboard with lowered thumb cluster – designed by geek-rabb1t.

The naked split strikes back

The naked split ortho 40% by onebigdoor is back with fully addressable rgb backlighting (gallery). Still without plate, case and PCB.


This Tightyl build by moltarpdx is based on Okke's design (git, STL).