2 layers133.4 × 110.2 mm Split keyboard, the printed circuit board in 3D

Split keyboard

Size: 133.4 × 110.2 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 89
Nets: 71
Pads: 336
Tracks, vias: 567, 60
Pours: 6
Routed: Yes
KiCad: KiCad 8.0 (file 20240108)
Created: 30 Mar 2024
Updated: 17 Oct 2026

Overview

Split keyboard is an open-source printed circuit board by celcius-plus-273, from the celcius-plus-273/split-keyboard repository on GitHub. It is a 2-layer board of 133.4 × 110.2 mm with 89 parts on 71 nets, routed with 567 tracks and 60 vias.

It is built around the ATMEGA32U4. Its parts include 34 diodes, 33 switches, 8 capacitors, 6 resistors and 2 connectors. It belongs with the keyboards and input boards and the AVR (ATmega, ATtiny) boards of this library.

Main components

ATMEGA32U4
UncategorisedUnknown maker

README

README.md

split-keyboard

Parts

Qty	Value	Footprint	References
32	D	Diode_SMD:D_SOD-123	D101, D102, D103, D104, D105, D106, D107, D108, D109, D110, D111, D112, D113, D114, D115, D116 +16
4	0.1uF	Capacitor_SMD:C_0603_1608Metric	C101, C102, C103, C104
4	MountingHole_Pad	MountingHole:MountingHole_2.2mm_M2_Pad_TopBottom	H101, H102, H103, H104
2	10k	Resistor_SMD:R_0603_1608Metric	R101, R104
2	1k	Resistor_SMD:R_0603_1608Metric	R107, R108
2	22	Resistor_SMD:R_0603_1608Metric	R105, R106
2	22pF	Capacitor_SMD:C_0603_1608Metric	C106, C107
2	GREEN	LED_SMD:LED_0603_1608Metric	D133, D134
1	,	CherryMX_PCB:CherryMX_1.00u_PCB	SW124
1	-	CherryMX_PCB:CherryMX_1.00u_PCB	SW106
1	.	CherryMX_PCB:CherryMX_1.00u_PCB	SW125
1	/	CherryMX_PCB:CherryMX_1.00u_PCB	SW126
1	0	CherryMX_PCB:CherryMX_1.00u_PCB	SW105
1	16 MHz	Crystal:Crystal_SMD_Abracon_ABM8G-4Pin_3.2x2.5mm	Y101
1	1uF	Capacitor_SMD:C_0603_1608Metric	C108
1	4.7uF	Capacitor_SMD:C_0603_1608Metric	C105
1	6	CherryMX_PCB:CherryMX_1.00u_PCB	SW101
1	7	CherryMX_PCB:CherryMX_1.00u_PCB	SW102
1	8	CherryMX_PCB:CherryMX_1.00u_PCB	SW103
1	9	CherryMX_PCB:CherryMX_1.00u_PCB	SW104
1	;	CherryMX_PCB:CherryMX_1.00u_PCB	SW119
1	ATmega32U4	Package_QFP:TQFP-44_10x10mm_P0.8mm	U101
1	BSPC	CherryMX_PCB:CherryMX_1.00u_PCB	SW113
1	Bluefruit LE	Connector_JST:JST_SH_SM08B-SRSS-TB_1x08-1MP_P1.00mm_Horizontal	J101
1	C1	CherryMX_PCB:CherryMX_1.00u_PCB	SW107
1	C2	CherryMX_PCB:CherryMX_1.00u_PCB	SW114
1	C3	CherryMX_PCB:CherryMX_1.00u_PCB	SW121
1	C4	CherryMX_PCB:CherryMX_1.00u_PCB	SW128
1	ENT	CherryMX_PCB:CherryMX_1.00u_PCB	SW120
1	H	CherryMX_PCB:CherryMX_1.00u_PCB	SW115
1	I	CherryMX_PCB:CherryMX_1.00u_PCB	SW110
1	J	CherryMX_PCB:CherryMX_1.00u_PCB	SW116
1	JST-PH	Connector_JST:JST_SH_SM04B-SRSS-TB_1x04-1MP_P1.00mm_Horizontal	J103
1	K	CherryMX_PCB:CherryMX_1.00u_PCB	SW117
1	L	CherryMX_PCB:CherryMX_1.00u_PCB	SW118
1	M	CherryMX_PCB:CherryMX_1.00u_PCB	SW123
1	M1	CherryMX_PCB:CherryMX_1.00u_PCB	SW130
1	M2	CherryMX_PCB:CherryMX_1.00u_PCB	SW131
1	N	CherryMX_PCB:CherryMX_1.00u_PCB	SW122
1	O	CherryMX_PCB:CherryMX_1.00u_PCB	SW111
1	P	CherryMX_PCB:CherryMX_1.00u_PCB	SW112
1	RSHIFT	CherryMX_PCB:CherryMX_1.00u_PCB	SW127
1	SPC	CherryMX_PCB:CherryMX_1.00u_PCB	SW129
1	SUPER	CherryMX_PCB:CherryMX_1.00u_PCB	SW132
1	U	CherryMX_PCB:CherryMX_1.00u_PCB	SW109
1	Y	CherryMX_PCB:CherryMX_1.00u_PCB	SW108
1	reset_sw	Button_Switch_SMD:SW_Push_1P1T_XKB_TS-1187A	S101

Questions

How big is the Split keyboard PCB?

It measures 133.4 × 110.2 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Split keyboard use?

89 parts, built around the ATMEGA32U4. 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 KiCad files?

From the celcius-plus-273/split-keyboard repository on GitHub, at the commit this page was made from: the board is rev2/rev2.kicad_pcb and its schematic keeb-rev1-mirror/keeb-rev1-mirror.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Split keyboard design in my own project?

Its repository states no licence, so its author keeps all rights: ask celcius-plus-273 before reusing the design.

Category and platform

Keyboards and input AVR (ATmega, ATtiny)

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/celcius-plus-273-split-keyboard-rev2" title="Split keyboard 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/celcius-plus-273-split-keyboard-rev2.jpg" alt="Split keyboard" width="1200" height="900">

A picture that opens the board, for a README

[![Split keyboard](https://pcbkit.io/embed/boards/celcius-plus-273-split-keyboard-rev2.jpg?size=s)](https://pcbkit.io/boards/celcius-plus-273-split-keyboard-rev2)

Source

Repository: celcius-plus-273/split-keyboard
Board file: rev2/rev2.kicad_pcb
Commit: a0e601e
Licence: Not stated

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