Atlas Keyboard

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

Host <--BLE-- Left (central + trackpoint) <--BLE-- Right (peripheral + trackpoint)

Mouse Layer

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

Thumb keys:
| SCROLL | LCLK | LCLK | RCLK |

• 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

nix develop
just build      # build both sides
just build-left # build left only
just keymap     # generate keymap SVG

Firmware outputs to firmware/out/.

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

Repo Structure

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