2 layers251 × 148.4 mm Split, the printed circuit board in 3D

Split

my split keyboard!

Size: 251 × 148.4 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 244
Nets: 215
Pads: 825
Tracks, vias: 3,254, 901
Routed: Yes
KiCad: KiCad 10.0 (file 20260206)
Created: 4 Aug 2026
Updated: 24 Aug 2026

Overview

Split is an open-source printed circuit board by dipa-cotton, from the dipa-cotton/split repository on GitHub. It is a 2-layer board of 251 × 148.4 mm with 244 parts on 215 nets, routed with 3,254 tracks and 901 vias.

It is built around the PCF8574AP and SK6812MINI-E. Its parts include 109 diodes, 58 capacitors, 55 switches, 13 resistors and 6 connectors. It belongs with the keyboards and input boards and the ESP8266 and nRF52 and nRF5x boards of this library.

Main components

README

README.md

split

my split keyboard!

journals

https://stardance.hackclub.com/projects/28331 check out stardance for my journals!

purpose

i wanted to make a keyboard that tracks biometric data, like heart rate, temperature, and other things using multiple sensors :) it also has a LOT more keys than your average keyboard, and will be a lot more comfortable to use.

components

the main files are my PCB and Schematic made in kicad, and I have directories of my code as well :)

BOM

100 capacitors
100 diodes
100 SK6812minis
2 XIAO-nRF52840-Plus-SMD
2 Olimex_MOD-WIFI-ESP8266-DEV
95 SW_Push (cherry mx switches)
2 max30102
2 tmp102
8 FSR
2 GSR
2 rotary encoders

pictures

right side:

### left side: Screenshot 2026-08-23 at 11 14 28 PM

Parts

244

Qty	Value	Footprint	References
55	1N914	Capacitor_SMD:C_0603_1608Metric	D41, D42, D43, D44, D45, D46, D47, D48, D49, D50, D51, D52, D53, D54, D55, D56 +39
55	C	Capacitor_SMD:C_0603_1608Metric	C104, C105, C106, C107, C108, C109, C110, C111, C112, C113, C114, C115, C116, C117, C118, C119 +39
55	SW_Push	Button_Switch_Keyboard:SW_Cherry_MX_1.00u_PCB	SW41, SW42, SW43, SW44, SW45, SW46, SW47, SW48, SW49, SW50, SW51, SW52, SW53, SW54, SW55, SW56 +39
54	SK6812MINI	LED_SMD:LED_SK6812MINI_PLCC4_3.5x3.5mm_P1.75mm	D186, D187, D188, D189, D190, D191, D192, D193, D194, D195, D196, D197, D198, D199, D200, D201 +38
13	R	Capacitor_SMD:C_0603_1608Metric	R1, R2, R11, R13, R14, R15, R16, R24, R25, R26, R27, R28, R30
5	Conn_01x02_Pin	TestPoint:TestPoint_Bridge_Pitch2.54mm_Drill1.0mm	J4, J6, J7, J8, J10
2	100nf	Capacitor_SMD:C_0603_1608Metric	C159, C161
1	100 nf	Capacitor_SMD:C_0603_1608Metric	C160
1	Conn_01x05_Pin	Connector_PinSocket_2.54mm:PinSocket_1x05_P2.54mm_Vertical	J12
1	Olimex_MOD-WIFI-ESP8266-DEV	Module:Olimex_MOD-WIFI-ESP8266-DEV	U10
1	PCF8574AP	Package_DIP:DIP-16_W7.62mm	U1
1	XIAO-nRF52840-Plus-SMD	Seeed:XIAO-nRF52840-Plus-SMD	U9

Questions

How big is the Split PCB?

It measures 251 × 148.4 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Split use?

244 parts, built around the PCF8574AP and SK6812MINI-E. 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 KiCad files?

From the dipa-cotton/split repository on GitHub, at the commit this page was made from: the board is right/split.kicad_pcb and its schematic left/split left.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Split design in my own project?

Its repository states no licence, so its author keeps all rights: ask dipa-cotton before reusing the design.

Category and platform

Keyboards and input ESP8266 nRF52 and nRF5x

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/dipa-cotton-split-split" title="Split in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/dipa-cotton-split-split.jpg" alt="Split" width="1200" height="900">

A picture that opens the board, for a README

[![Split](https://pcbkit.io/embed/boards/dipa-cotton-split-split.jpg?size=s)](https://pcbkit.io/boards/dipa-cotton-split-split)

Source

Repository: dipa-cotton/split
Board file: right/split.kicad_pcb
Commit: 0fe3bc5
Licence: Not stated

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