bezmi/orthrus2656 key wireless split keyboard running on QMK. Staggered Orthogonal layout
Atreus split is an open-source printed circuit board by bezmi, from the bezmi/orthrus repository on GitHub. It is a 2-layer board of 133.4 × 111.4 mm with 34 parts on 35 nets, routed with 1,165 tracks and 46 vias.
It is built around the SI2302. Its parts include 28 switches, 2 diodes, 2 transistors and 1 connector. It belongs with the keyboards and input boards and the nRF52 and nRF5x boards of this library.
56 key wireless split keyboard running on QMK. Staggered orthogonal layout
Refer to individual folders for help on the build, raise an issue if you need any extra help :)
To use with qmk, just merge the qmk_firmware/ directory in this repository with your downloaded qmk_firmware directory
Over the time that I have been using this keyboard, the "sandwich" style battery holder has bee less than ideal. I have modified my keyboard with these battery holders, which are epoxied to the top PCB for each half. The negative terminal of the battery holder is soldered to pad 3 "GND_P" on the top PCB with a short wire:
The positive terminal is soldered to the through-hole VCC connection with a short wire:
This is what it looks like now.
Thanks to @reversebias for the inspiration as well as the firmware to make this work and @joric for making the firmware work with the cheaper nrf modules
Thanks to technomancy for the original 42 key atreus design and profet for the atreus62 design that I have been using for quite a while.
| Qty | Value | Footprint | References |
|---|---|---|---|
| 28 | CHERRY_MX | Atreus_Split:cherry | S11, S12, S13, S14, S21, S22, S23, S24, S31, S32, S33, S34, S41, S42, S43, S44 +12 |
| 2 | CORE_NRF51822_Black | Atreus_Split:CORE_NRF51822_Black | D1, D2 |
| 2 | Si2302 | Atreus_Split:SI2302 | Q1, Q2 |
| 1 | Battery_Cell | Atreus_Split:CR2032_pad | BT1 |
| 1 | Conn_01x04 | Atreus_Split:Pin_Header_Angled_1x04_Pitch2.54mm | J1 |
It measures 133.4 × 111.4 mm and has 2 copper layers, 1.6 mm thick.
34 parts, built around the SI2302. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
From the bezmi/orthrus repository on GitHub, at the commit this page was made from: the board is pcb/Atreus_Split/atreus_split.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Its repository states no licence, so its author keeps all rights: ask bezmi before reusing the design.
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