2 layers150 × 77.5 mm
2 layers62 × 18 mm
Tk pie thumb
tk-pie/tk-pie1Tk🥧
- Size
- 62 × 18 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 15
- Nets
- 9
- Pads
- 36
- Tracks, vias
- 60, 7
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 20 May 2025
- Updated
- 2 Nov 2026
Overview
Tk pie thumb is an open-source printed circuit board by tk-pie, from the tk-pie/tk-pie repository on GitHub. It is a 2-layer board of 62 × 18 mm with 15 parts on 9 nets, routed with 60 tracks and 7 vias.
README
README.mdTk🥧
Alternatively: tk-pie, or Test Keyboard Please IgnorE. A split keyboard design and firmware.
Directory
/lib
A rust library, and the bulk of the keyboard firmware implementation. Written using the Embassy framework.
/left and /right
Rust binaries, one for each half of the split keyboard.
Most of the actual logic is implemented in /lib.
/schematic
KiCad schematics of the keyboard PCBs.
/case
3d-printable files of the keyboard case and related plastics.
/editor
A graphical program for configuring the keyboard layout. Work in progress.
Compilation target
This Rust workspace contains crates which should be compiled for different targets.
When developing firmware, the target should be set to e.g. riscv32imac-unknown-none-elf:
cargo check --target riscv32imac-unknown-none-elfAnd when developing for desktop, the target should be set to your host target.
By default, this is the case. The target can be configured in your editor, or in
.cargo/config.toml
Firmware development
Required tools:
- Rust
probe-rsfor flashing the firmware. Follow instructions at https://probe.rs/flip-link- A debug probe of some kind, I recommend a Pitaya-Link
To flash:
- plug in the probe,
cdinto eitherleftorrightcargo run
Running tests
The keyboad library comes with some unit tests:
cargo test -p tk-pie --target x86_64-unknown-linux-gnuParts
15| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | Conn_01x01_Pin | Footprints:Pin0.9mm | E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12 |
| 3 | ~ | Footprints:MX_SW_SOCKET_LED_REV | S1, S2, S3 |
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Questions
How big is the Tk pie thumb PCB?
It measures 62 × 18 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Tk pie thumb use?
15 parts. 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.
Where can I download the Tk pie thumb KiCad files?
From the tk-pie/tk-pie repository on GitHub, at the commit this page was made from: the board is schematic/pcb_thumb/tk-pie-thumb.kicad_pcb and its schematic schematic/pcb_left/tk-pie-left.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Tk pie thumb design in my own project?
Its repository states no licence, so its author keeps all rights: ask tk-pie before reusing the design.