2 layers208.8 × 396.9 mm
Ferris
pierrechevalier83/ferris
A low profile split keyboard designed to satisfy one single use case elegantly
145 parts1.3k
2 layers102 × 81.9 mm
Risha
sboysel/risha5Risha is an ultra-compact, wired split ortholinear keyboard featuring:
- Size
- 102 × 81.9 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 23
- Pads
- 152
- Tracks, vias
- 244, 5
- Pours
- 79
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 30 Apr 2023
- Updated
- 23 Feb 2025
Overview
Risha is an open-source printed circuit board by sboysel, from the sboysel/risha repository on GitHub. It is a 2-layer board of 102 × 81.9 mm with 21 parts on 23 nets, routed with 244 tracks and 5 vias.
It is built around the PJ-320A. Its parts include 1 IC and 1 connector. It belongs with the RP2040 boards of this library.
Main components
1README
README.mdRisha
Risha is an ultra-compact, wired split ortholinear keyboard featuring:
- 36 keys
- Diodeless, reversible PCB (under 102mm x 102mm)
- Waveshare RP2040-Zero (cutout for flush mounting)
- Rear-facing TRRS connection
This design prioritizes affordability, simplicity, and ease of assembly. With a total cost of around $40 AUD, it's an excellent choice for a budget-friendly custom keyboard.
Features
- Fully split layout with only 36 keys
- No diodes required for a simpler build process
- Reversible PCB (same PCB can be used for both halves)
- Compact design for travel and portability
- RP2040-Zero powered, enabling powerful firmware support with KMK
- TRRS interconnection between the halves
Getting Started
To build your own Risha, check out the following guides:
- Buying List – Everything you need to order.
- Build Instructions – Step-by-step assembly guide.
- Flashing Guide – Installing KMK firmware.
License
This project is open-source and freely available for personal and commercial use. Contributions are welcome!
Additional Resources
- KMK Firmware – The firmware used for Risha
- RP2040-Zero Docs – Official documentation for the microcontroller
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | MX_SW_solder | risha:SW_MX_Reversible_1u | MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8, MX10, MX11, MX12, MX13, MX14, MX15, MX16, MX17 +1 |
| 2 | LOGO | risha:north-sky-silk | G***, G*** |
| 1 | PJ-320A | risha:PJ-320A_Reversible | J1 |
| 1 | RP2040-Matrix | risha:RP2040-Matrix_AH | U1 |
Questions
How big is the Risha PCB?
It measures 102 × 81.9 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Risha use?
21 parts, built around the PJ-320A. 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 Risha KiCad files?
From the sboysel/risha repository on GitHub, at the commit this page was made from: the board is risha.kicad_pcb and its schematic risha.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Risha design in my own project?
Its repository states no licence, so its author keeps all rights: ask sboysel before reusing the design.
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