2 layers316 × 119 mm
Teensy Grovebox
jerry20091103/Teensy_Grovebox
A portable synth and music multi-tool made with Teensy 4.1
142 parts150MIT
2 layers304.2 × 119.5 mm
Split keyboar
bluefeng2/Split-Keebwireless split keyboard
- Size
- 304.2 × 119.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 142
- Nets
- 90
- Pads
- 712
- Tracks, vias
- 712, 39
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 16 May 2026
- Updated
- 5 Sep 2026
Overview
Split keyboar is an open-source printed circuit board by bluefeng2, from the bluefeng2/Split-Keeb repository on GitHub. It is a 2-layer board of 304.2 × 119.5 mm with 142 parts on 90 nets, routed with 712 tracks and 39 vias.
Its parts include 60 diodes, 60 switches, 4 resistors, 2 ICs and 2 connectors. It belongs with the keyboards and input boards and the nRF52 and nRF5x boards of this library.
README
README.mdSPLITKB
A custom wireless split mechanical keyboard powered by the nRF52840. Features an ergonomic split layout, OLED display on each half, rotary encoders, and a fully custom PCB and enclosure.
I made this project because I wanted to try something new, and there just so happened to be a guide on it, so I just followed it.
This project follows the Stasis Split Keyboard guide.
3D Model
Made in Fusion 360
PCB
Made in KiCad
BOM
| Name | Purpose | Quantity | Total Cost (USD) | Distributor | Link |
|---|---|---|---|---|---|
| Kailh V2 Choc Switches | Switches | 1 | 23.18 | AliExpress | https://www.aliexpress.com/item/1005008382793794.html |
| SuperMini nRF52840 | Microcontroller | 2 | 5.66 | AliExpress | https://www.aliexpress.com/item/1005007383375306.html |
| EC11 Rotary Encoder | Rotary Encoder | 1 | 2.49 | AliExpress | https://www.aliexpress.com/item/1005007644083514.html |
| Kailh Choc Hot Swap Sockets | Hot Swap Sockets | 1 | 0.99 | AliExpress | https://www.aliexpress.com/item/1005009794038277.html |
| Keycaps | Keycaps | 1 | 26.36 | AliExpress | https://www.aliexpress.com/item/1005010264586378.html |
| LiPo Battery | Battery | 1 | 7.28 | AliExpress | https://www.aliexpress.com/item/1005009279554068.html |
| PCB | PCB | 1 | 34.39 | JLCPCB | N/A |
| Diodes | Key Matrix | 1 | Included | LCSC | N/A |
| 806kΩ Resistor | Battery Circuit | 1 | Included | LCSC | N/A |
| 2MΩ Resistor | Battery Circuit | 1 | Included | LCSC | N/A |
| Miscellaneous LCSC Components | Passive Components | 1 | 1.91 | LCSC | N/A |
Assembly Instructions:
1. PCB
- Follow the schematic.
- The only non-diode smd components are the resistors for the voltage divider.
- The Pro Micro should be soldered with a gap large enough for the battery to fit underneath.
- The OLED goes right above the Pro Micro
2. CASE
- Screw in the pcb to the bottom case (CaseBottomR/L.stl), using heat set inserts and M3 bolts.
- Rest the plate (CasePlateR/L.stl) on top of the pcb. The switches are hotswappabe.
- Put in the switches.
3. Everything Else
- Put the keycaps on.
- Put the encoder knob on. (Knob.stl)
4. Firmware
- Upload the Firmware in this repo to each side.
Parts
142| Qty | Value | Footprint | References |
|---|---|---|---|
| 60 | D | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +44 |
| 56 | SW_Push | PCM_marbastlib-xp-choc:SW_choc_v2_HS_CPG135001S30_1u | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +40 |
| 8 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H9, H10, H11, H12 |
| 4 | TestPoint | TestPoint:TestPoint_Plated_Hole_D2.0mm | TP1, TP2, TP3, TP4 |
| 2 | 2M | Resistor_SMD:R_0805_2012Metric | R2, R4 |
| 2 | 806k | Resistor_SMD:R_0805_2012Metric | R1, R3 |
| 2 | Break Off | Panelization:MouseBite-Slot_2.0x4.5mm_outset_D0.5mm_P0.85mm_7h | BO3, H8 |
| 2 | Conn_01x04_Socket | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J1, J2 |
| 2 | RotaryEncoder_Switch | Rotary_Encoder:RotaryEncoder_Alps_EC11E-Switch_Vertical_H20mm | SW61, SW62 |
| 2 | SW_Push | PCM_marbastlib-xp-choc:SW_choc_v2_HS_CPG135001S30_1.5u | SW57, SW58 |
| 2 | SuperMini nRF52840 | PCM_marbastlib-xp-promicroish:SuperMini_nRF52840_AH_USBup | U3, U4 |
Questions
How big is the Split keyboar PCB?
It measures 304.2 × 119.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Split keyboar use?
142 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 Split keyboar KiCad files?
From the bluefeng2/Split-Keeb repository on GitHub, at the commit this page was made from: the board is PCB/split keyboar.kicad_pcb and its schematic PCB/side.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Split keyboar design in my own project?
Its repository states no licence, so its author keeps all rights: ask bluefeng2 before reusing the design.
Similar boards
- 2 layers156 × 185.9 mm
Torabo tsuki lp M
sekigon-gonnoc/torabo-tsuki-lp
torabo-tsuki lp is low profile split keyboard with trackball(s)
142 parts110 - 2 layers167.6 × 97.5 mm
AS3397 proto DIP
PhysicsDptAngers/polyUAnalog
Open source, analog and polyphonic synthesizer
142 parts88MIT - 2 layers357.8 × 124.5 mm
Vic2020mainboard
danwerner21/vic2020
A Vic-20 clone created with [almost] all readily available parts
142 parts78 - 2 layers144.8 × 88.9 mm
- 2 layers242.2 × 72.1 mm
- 2 layers285 × 94.6 mm
- 2 layers304.8 × 95.3 mm
