Keybit
About the Keybit PCB
Keybit is an open source RISC-V PCB design by notaroomba, published on GitHub. It is a 2-layer board measuring 19.1 × 19.1 mm, with 19 components from 5 distinct parts.
Its main chip is the CH32V003FXUX, from the RISC-V family. Other key parts include the YZ13515055F-02025-02. By type, the board carries 9 ICs, 8 resistors, 1 switch and 1 capacitor.
It belongs with the keyboards, iot & wireless and power & battery designs in this gallery.
From the project
A truly modular keyboard
- Truly modular - every key is its own self-contained board. Pop them off, rearrange the layout, and snap them back wherever you want. - Magnetic keycaps - caps hold on with embedded 2×0.5mm magnets and latch onto the switch's side rails. No tools, no soldering. - Pogo-pin interconnect - keys link to the main board (and each other) through spring-loaded pogo pins and pads, so there's nothing to plug in. - Smart per-key MCU - each module runs a cheap CH32V003 RISC-V microcontroller and reports over a shared I²C bus. - Bluetooth + USB main board - the central board is built around an…
Main components on the Keybit
Keybit bill of materials (BOM)
19 components, 5 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CH32V003FXUX CH32V003FxUx | QFN-20-1EP_3x3mm_P0.4mm_EP1.65x1.65mm | U1 |
| 8 | YZ13515055F-02025-02 | CONN-SMD_YZ13515055F-02025-02 | U2, U3, U4, U5, U6, U7, U8, U9 |
| 1 | SW_Push | SW_Cherry_MX_1.00u_PCB | SW1 |
| 1 | 100NF 100nF | C_0402_1005Metric | C1 |
| 8 | 4.7K | R_0402_1005Metric | R1, R2, R3, R4, R5, R6, R8, R11 |
Keybit design files
The KiCad project lives in the notaroomba/keybytes repository on GitHub; these links point at the commit this page was built from.
Keybit: common questions
What microcontroller does the Keybit use?
The Keybit is built around the CH32V003FXUX, from the RISC-V family.
How big is the Keybit PCB?
The Keybit measures 19.1 × 19.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Keybit?
19 components, from 5 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Keybit design files?
From the notaroomba/keybytes repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Keybit design in my own project?
The repository has no license, so all rights stay with notaroomba. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Keybit without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RISC-V firmware against it before you order a PCB.
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