2 layers426.2 × 156.7 mm SplitKeyOne, the printed circuit board in 3D

SplitKeyOne

Split keyboard layout and firmware

Size: 426.2 × 156.7 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 233
Nets: 169
Pads: 1,315
Tracks, vias: 2,260, 89
Pours: 2
Routed: Yes
KiCad: KiCad 4
Created: 15 Oct 2018
Updated: 7 Jan 2020

Overview

SplitKeyOne is an open-source printed circuit board by matthewbergman, from the matthewbergman/SplitKeyOne repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 426.2 × 156.7 mm with 233 parts on 169 nets, routed with 2,260 tracks and 89 vias.

It is built around the MAX6951CEE+. Its parts include 102 diodes, 70 switches, 9 capacitors, 4 ICs and 3 resistors. It belongs with the keyboards and input boards and the NXP (LPC, Kinetis, i.MX RT) boards of this library.

Main components

MAX6951CEE+
QSOP-16-EP-150mil0℃~+70℃ 2.7V~5.5V 3-Wire Serial Interface QSOP-16-EP-150mil Digital Tube Drivers ROHSMaxim Integrated (Analog Devices)LED Display Drivers

README

README.md

SplitKeyOne

Very simple split keyboard PCB layout and firmware using Cherry MX switches and Teensy3 micro.

CAD

KiCAD pcb files

TODO:

Fix the stabalizer mounting holes for vertically mounted keycaps
Add more mounting holes for rigidity
Switch to SMT diodes or switches with built in diodes

SplitKeyOneFirmware

Simple firmware to read the key matrix and send the correct keypress or keyrelease signal. Optionally lights up the LED for each key while it is pressed.

TODO:

Emulate mouse buttons
Emulate joystick axis and buttons

Alt text

Parts

233

Qty	Value	Footprint	References
102	D	Diodes_ThroughHole:D_DO-35_SOD27_P7.62mm_Horizontal	D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D100, D101, D102 +86
3	0.1uF	Capacitors_SMD:C_0805_HandSoldering	C3, C6, C9
3	22uF	Capacitors_SMD:C_0805_HandSoldering	C2, C5, C8
3	MAX6951	Housings_SSOP:TSSOP-16-1EP_4.4x5mm_Pitch0.65mm	U1, U3, U4
2	27pF	Capacitors_SMD:C_0805_HandSoldering	C1, C4
2	56k	Resistors_SMD:R_0805_HandSoldering	R1, R3
2	M04	Custom:SparkFun-1X04_LOCK	J1, J2
1	56K	Resistors_SMD:R_0805_HandSoldering	R2
1	A	Custom:CHERRY-MX-LED-Socket	S27
1	B	Custom:CHERRY-MX-LED-Socket	S54
1	BACKSLASH	Custom:CHERRY-MX-LED-Socket	S95
1	BACKSPACE	SplitKeyOne:CHERRY-MX-LED-Socket-2-stabilizer	S94
1	C	Capacitors_SMD:C_0805_HandSoldering	C7
1	C	Custom:CHERRY-MX-LED-Socket	S43
1	CAPS	Custom:CHERRY-MX-LED-Socket	S19
1	COMMA	Custom:CHERRY-MX-LED-Socket	S71
1	D	Custom:CHERRY-MX-LED-Socket	S42
1	DELETE	Custom:CHERRY-MX-LED-Socket	S6
1	DOWN	Custom:CHERRY-MX-LED-Socket	S8
1	E	Custom:CHERRY-MX-LED-Socket	S41
1	END	Custom:CHERRY-MX-LED-Socket	S10
1	ENTER	SplitKeyOne:CHERRY-MX-LED-Socket-2-stabilizer	S96
1	EQUALS	Custom:CHERRY-MX-LED-Socket	S86
1	F	Custom:CHERRY-MX-LED-Socket	S48
1	F1	Custom:CHERRY-MX-LED-Socket	S25
1	F10	Custom:CHERRY-MX-LED-Socket	S85
1	F11	Custom:CHERRY-MX-LED-Socket	S90
1	F12	Custom:CHERRY-MX-LED-Socket	S93
1	F2	Custom:CHERRY-MX-LED-Socket	S30
1	F3	Custom:CHERRY-MX-LED-Socket	S34
1	F4	Custom:CHERRY-MX-LED-Socket	S39
1	F5	Custom:CHERRY-MX-LED-Socket	S46
1	F6	Custom:CHERRY-MX-LED-Socket	S62
1	F7	Custom:CHERRY-MX-LED-Socket	S67
1	F8	Custom:CHERRY-MX-LED-Socket	S74
1	F9	Custom:CHERRY-MX-LED-Socket	S79
1	G	Custom:CHERRY-MX-LED-Socket	S53
1	HOME	Custom:CHERRY-MX-LED-Socket	S3
1	INSERT	Custom:CHERRY-MX-LED-Socket	S2
1	LALT	Custom:CHERRY-MX-LED-Socket	S33
1	LCTRL	Custom:CHERRY-MX-LED-Socket	S24
1	LEFT	Custom:CHERRY-MX-LED-Socket	S7
1	LESC	Custom:CHERRY-MX-LED-Socket	S14
1	LSHIFT	SplitKeyOne:CHERRY-MX-LED-Socket-2-stabilizer	S20
1	LSPACE	SplitKeyOne:CHERRY-MX-LED-Socket-2-stabilizer	S55
1	LVENTER	SplitKeyOne:CHERRY-MX-LED-Socket-2-stabilizer	S18
1	LWIN	Custom:CHERRY-MX-LED-Socket	S29
1	MINUS	Custom:CHERRY-MX-LED-Socket	S80
1	NUM0	Custom:CHERRY-MX-LED-Socket	S75
1	NUM1	Custom:CHERRY-MX-LED-Socket	S26
1	NUM2	Custom:CHERRY-MX-LED-Socket	S31
1	NUM3	Custom:CHERRY-MX-LED-Socket	S35
1	NUM4	Custom:CHERRY-MX-LED-Socket	S40
1	NUM5	Custom:CHERRY-MX-LED-Socket	S45
1	NUM6	Custom:CHERRY-MX-LED-Socket	S51
1	NUM7	Custom:CHERRY-MX-LED-Socket	S57
1	NUM8	Custom:CHERRY-MX-LED-Socket	S63
1	NUM9	Custom:CHERRY-MX-LED-Socket	S68
1	PERIOD	Custom:CHERRY-MX-LED-Socket	S78
1	PGDN	Custom:CHERRY-MX-LED-Socket	S12
1	PGUP	SplitKeyOne:CHERRY-MX-LED-Socket	S5
1	Q	Custom:CHERRY-MX-LED-Socket	S32
1	R	Custom:CHERRY-MX-LED-Socket	S47
1	RALT	Custom:CHERRY-MX-LED-Socket	S84
1	RCTRL	Custom:CHERRY-MX-LED-Socket	S97
1	RENTER	SplitKeyOne:CHERRY-MX-LED-Socket-2-stabilizer	S99
1	RESC	Custom:CHERRY-MX-LED-Socket	S100
1	RIGHT	Custom:CHERRY-MX-LED-Socket	S13
1	RSHIFT	SplitKeyOne:CHERRY-MX-LED-Socket-2-stabilizer	S89
1	RSPACE	Custom:CHERRY-MX-LED-Socket	S61
1	RWIN	Custom:CHERRY-MX-LED-Socket	S92
1	S	Custom:CHERRY-MX-LED-Socket	S37
1	SLASH	Custom:CHERRY-MX-LED-Socket	S83
1	T	Custom:CHERRY-MX-LED-Socket	S52
1	TAB	Custom:CHERRY-MX-LED-Socket	S23
1	TICK	Custom:CHERRY-MX-LED-Socket	S22
1	Teensy3.6_nopogo	Custom:Teensy35_36_nopogo	U2
1	U1	Custom:CHERRY-MX-LED-Socket	S21
1	U10	Custom:CHERRY-MX-LED-Socket	S102
1	U11	Custom:CHERRY-MX-LED-Socket	S17

The 190 most common of 233 parts.

Questions

How big is the SplitKeyOne PCB?

It measures 426.2 × 156.7 mm and has 2 copper layers, 1.6 mm thick.

What parts does the SplitKeyOne use?

233 parts, built around the MAX6951CEE+. 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 SplitKeyOne KiCad files?

From the matthewbergman/SplitKeyOne repository on GitHub, at the commit this page was made from: the board is CAD/SplitKeyOne.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the SplitKeyOne design in my own project?

Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Keyboards and input NXP (LPC, Kinetis, i.MX RT)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/matthewbergman-splitkeyone" title="SplitKeyOne 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/matthewbergman-splitkeyone.jpg" alt="SplitKeyOne" width="1200" height="900">

A picture that opens the board, for a README

[![SplitKeyOne](https://pcbkit.io/embed/boards/matthewbergman-splitkeyone.jpg?size=s)](https://pcbkit.io/boards/matthewbergman-splitkeyone)

Source

Repository: matthewbergman/SplitKeyOne
Board file: CAD/SplitKeyOne.kicad_pcb
Commit: 6366c83
Licence: GPL-3.0

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This work is licensed under a [Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License][cc-by-nc-sa].
233 parts7