2 layers52.2 × 52.2 mm
Base promicro
google/mozc-devices
Circuit diagrams and firmware source code for Gboard DIY keyboards
30 parts3kApache-2.0
2 layers124.5 × 99.1 mm
Split keyboard v3
dholifield/split427wired split ergonomic mechanical keyboard
- Size
- 124.5 × 99.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 30
- Nets
- 56
- Pads
- 228
- Tracks, vias
- 299, 12
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 6 May 2025
- Updated
- 13 Feb 2026
Overview
Split keyboard v3 is an open-source printed circuit board by dholifield, from the dholifield/split42 repository on GitHub. It is a 2-layer board of 124.5 × 99.1 mm with 30 parts on 56 nets, routed with 299 tracks and 12 vias.
It is built around the PCA9505DGG. Its parts include 21 switches, 3 resistors, 2 capacitors, 1 IC and 1 connector. It belongs with the keyboards and input boards and the RP2040 boards of this library.
Main components
1README
README.mdsplit-keyboard
- custom reversible PCB using PCA9505 expanders talking to a Seeed XIAO RP2040 over I2C
- 21 keys per half
- beekeeb SMOLO keycaps
- Kailh x Lofree Ghost switches
- 3D printed case
Parts
30| Qty | Value | Footprint | References |
|---|---|---|---|
| 21 | Keyswitch | Switches:Kailh_Low_Profile | S0, S1, S2, S3, S4, S10, S11, S12, S13, S14, S15, S16, S17, S18, S19, S20 +5 |
| 2 | 0.1uF | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C1, C2 |
| 2 | 1.6k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1, R2 |
| 1 | 2k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R3 |
| 1 | MCU_Seeed_XIAO_RP2040 | Switches:Seeed_XIAO_RP2040 | U1 |
| 1 | PCA9505DGG | Switches:PCA9505 | PCA9505 |
| 1 | SolderJumper_3_Open | Jumper:SolderJumper-3_P2.0mm_Open_TrianglePad1.0x1.5mm_NumberLabels | JP1 |
| 1 | Vcc, SDA, SCL, INT, GND | Switches:SolderWire-5 | J1 |
Questions
How big is the Split keyboard v3 PCB?
It measures 124.5 × 99.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Split keyboard v3 use?
30 parts, built around the PCA9505DGG. 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 keyboard v3 KiCad files?
From the dholifield/split42 repository on GitHub, at the commit this page was made from: the board is pcb/split_keyboard_v3/split_keyboard_v3.kicad_pcb and its schematic pcb/split_keyboard_v3/split_keyboard_v3.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Split keyboard v3 design in my own project?
Its repository states no licence, so its author keeps all rights: ask dholifield before reusing the design.
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