#+TITLE: Atlas Keyboard #+OPTIONS: toc:nil num:nil

[[images/atlas-render.png]]

[[firmware/keymap.svg]]

[[images/atlas_jan_small.jpg]]

Atlas 34-key split ergonomic keyboard with dual TrackPoints and BLE wireless (no dongle).

Choc V1 hotswap switches
XIAO BLE (nRF52840) controllers
Sprintek all-in-one TrackPoint modules on both halves
ZMK firmware, BLE split — no dongle needed

** Status (Mar 2026)

BLE split working — direct host connection, no dongle
Left TrackPoint working (Sprintek AIO, PS/2 via UART)
Right TrackPoint wired, testing in progress
Mouse layer auto-activates on trackpoint movement
Scroll mode on thumb key hold
PCBs: prototype fabricated, iterating
Case: wooden prototype

** Architecture #+begin_example Host <--BLE-- Left (central + trackpoint) <--BLE-- Right (peripheral + trackpoint) #+end_example

** Mouse Layer When moving trackpoint, the mouse layer auto-activates for 1 second after last movement.

Scroll: Hold to convert movement to scroll wheel

** Hardware

TrackPoint: Sprintek all-in-one module, PS/2 via UART
Pins: D6 (SCL), D7 (SDA), P0.09 (reset)
Both sides use identical wiring
Controller: Seeed XIAO nRF52840 (BLE)

** Build #+begin_src bash nix develop just build # build both sides just build-left # build left only just keymap # generate keymap SVG #+end_src

Firmware outputs to =firmware/out/=.

PCB generation pipeline is documented in =tools/readme.org=.

** Repo Structure #+begin_example justfile build commands (firmware + PCB) flake.nix nix dev environment nix/ nix package defs (kbplacer, kiswitch, keymap-drawer) tools/ PCB generation pipeline (see tools/readme.org) firmware/ ZMK workspace (shields, keymap, config) images/ project photos + renders #+end_example

Atlas

Install / Use

README