Shoedler54 open-source wireless split keyboard built with ergogen, Choc hotswap

Simon Schödler has released Shoedler54, a low-profile, open-source split keyboard built to showcase a purely declarative ergogen workflow and to lower the entry barrier for Choc-based wireless builds. The layout is compact but functional: 54 keys arranged as 6×4 plus 3 thumb keys. Key hardware highlights include support for Choc V1 or V2 switches in a hotswap configuration, reversible PCBs, Promicro NRF52840 controllers, and a 3D-printed case. The project repository includes an easy-to-print 18 mm keycap.

The project was born from a learning goal. Simon said: “This project came to life as I wanted to get up to speed with ergogen.xyz. The main goal of was to build a keyboard using solely the declarative ergogen paradigm - including making a case. As such, the only thing that was done outside of ergogen was to route the PCB and flip one case half in the slicer – Simon.” That focus on generating both layout and case from ergogen makes Shoedler54 a concrete example of how ergonomic CAD and declarative configuration can replace ad-hoc mechanical design workflows.

Shoedler54 positions itself among recent compact, community-driven splits, drawing explicit inspiration from designs like the ZSA Voyager and Silakka54. A Reddit post by the project author or an early builder captured that similarity succinctly: “My first try at a custom keyboard - solely powered by ergogen.xyz. Essentially a wireless Voyager, which is what I was using for a little” The comparison signals the target feel and ergonomics: low profile, thumb-focused clusters, and a wireless orientation that suits mobile desks and shared workspaces.

For builders and tinkerers, the practical value is clear. Choc hotswap support lets users try Choc V1 or V2 profiles without soldering, and a reversible PCB reduces orientation headaches when assembling mirrored halves. The 3D-printable case and included 18 mm keycap let makers prototype quickly. Using Promicro NRF52840 controllers points to a capable wireless stack and modern MCU capabilities, though precise firmware and wireless protocol details were not included in the available project notes.

Several useful details are not specified in the materials provided: battery type and charging, exact board model or pinout for the “Promicro NRF52840 controllers,” the firmware used, and a full BOM or license. Verify firmware, battery and BOM in the repository before ordering parts or committing to a build.

Shoedler54 shows what ergogen can do when pushed beyond layout into case generation, and it offers an accessible path to a hotswap Choc wireless split. Expect community forks, tweaks for tenting and splay, and shared build logs as people test the reversible PCB and print the case halves. For now, the project is a compact, low-profile template for anyone looking to experiment with declarative design and Choc form factors.