2 layers102.4 × 211.3 mm
Haxophone001
cardonabits/haxo-hw
Haxophone, an electronic musical instrument that resembles a saxophone
92 parts674
2 layers232.7 × 96.3 mm
Splitty
NizaOS/SplittyKeyboard splitted in half with 20 keys each
- Size
- 232.7 × 96.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 92
- Nets
- 81
- Pads
- 508
- Tracks, vias
- 1,131, 57
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 7 Jan 2026
- Updated
- 4 Apr 2026
Overview
Splitty is an open-source printed circuit board by NizaOS, from the NizaOS/Splitty repository on GitHub. It is a 2-layer board of 232.7 × 96.3 mm with 92 parts on 81 nets, routed with 1,131 tracks and 57 vias.
Its parts include 40 diodes, 40 switches and 2 ICs. It belongs with the keyboards and input boards and the nRF52 and nRF5x boards of this library.
README
README.mdSPLITTY
A 40% Wireless Split Mechanical Keyboard
Low Profile • Choc v1 • ZMK Firmware • 1000mAh Battery Life
Project Overview
SPLITTY is a custom-built, wireless split keyboard designed for portability and ergonomics. It utilizes the Seeed Studio XIAO nRF52840 for Bluetooth 5.0 connectivity and is built on a custom PCB optimized for Kailh Choc v1 low-profile switches.
why i made this project
i wanted a low profile split keyboard that was actually portable and didnt cost a fortune. most commerical options are too bulky or wired only so i decided to desin something that fits in a laptop bag easily while keeping the ergonomics of a split layout.
how to use
to use the keyboard you need to flash zmk firmware to both halves. double tap reset button on the xiao to enter bootloader mode then drag and drop the uf2 files. once its flashed you can pair it to your computer via bluetooth settings by searching for splitty. the left side is usually the central half that connects to the pc.
Technical Specifications
- Microcontroller: 2x Seeed Studio XIAO nRF52840 (Bluetooth 5.0)
- Switch Type: Kailh Choc v1 (PG1350) - Linear/Tactile/Clicky
- Battery: 2x 1000mAh LiPo (WLY394058) - Approx. 1+ month battery life
- PCB Features: Hotswap support, reversible footprint, 1.2mm thickness
- Firmware: ZMK (Wireless-first firmware)
Bill of Materials (BOM)
Prices estimated in USD based on INR conversion ($1 ≈ ₹90.27).
| Component | Qty | Unit Price | Total (USD) | Sourcing Link |
|---|---|---|---|---|
| Seeed XIAO BLE nRF52840 | 2 | $14.88 | $25.87 | Fab.to.Lab |
| Kailh Choc v1 Switches | 40 | $0.55 | $22.00 | NeoMacro |
| Choc Hotswap Sockets | 40 | $0.18 | $7.00 | NeoMacro |
| MBK/MCC Keycaps | 40 | $0.40 | $16.00 | NeoMacro |
| PCB (Manufacturing) | 1 | $21.00 | $21.00 | JLCPCB |
| 3D Printed Case (Shipping) | 1 | $10.00 | $10.00 | Printing Legion |
| LiPo Battery (1000mAh) Model: WLY394058 (3.9mm thick) | 2 | $4.18 | $8.36 | Robu.in |
| 1N4148W Diodes (SOD-123) | 40 | $0.006 | $0.24 | Robu.in |
| 806K1 Resistor (0805) | 10 | $0.023 | $0.14 | Robu.in |
| 2M1 Resistor (0805) | 10 | $0.020 | $0.11 | Robu.in |
| ESTIMATED TOTAL | $110.72 | |||
Project Gallery
Parts
92| Qty | Value | Footprint | References |
|---|---|---|---|
| 40 | D | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +24 |
| 40 | SW_Push_45deg | marbastlib-choc:SW_choc_v1_HS_CPG135001S30_1u | SW1, SW2, SW10, SW11, SW12, SW13, SW14, SW15, SW16, SW17, SW18, SW19, SW20, SW21, SW22, SW23 +24 |
| 4 | R | Resistor_SMD:R_0805_2012Metric | 2M1, 806K1, R2, R4 |
| 2 | BAT | TestPoint:TestPoint_Pad_D2.0mm | TP1, TP2 |
| 2 | GND | TestPoint:TestPoint_Pad_D2.0mm | TP3, TP4 |
| 2 | XIAO-nRF52840-SMD | XIAO_MOD:modified-XIAO-nRF52840-SMD | U1, U2 |
| 2 | break off | panelization:mouse-bite-2mm-slot | H2, H4 |
Questions
How big is the Splitty PCB?
It measures 232.7 × 96.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Splitty use?
92 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 Splitty KiCad files?
From the NizaOS/Splitty repository on GitHub, at the commit this page was made from: the board is SplittyPCB/Splitty.kicad_pcb and its schematic SplittyPCB/Half.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Splitty design in my own project?
Its repository states no licence, so its author keeps all rights: ask NizaOS before reusing the design.
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