HardLabs

UnSplit

swiftrax·UnSplit·Hardware/FullGroundPlane/UnSplit.kicad_pcb

UnSplit PCB layout, top view — open source AVR/Arduino board by swiftrax
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About the UnSplit PCB

UnSplit is an open source AVR/Arduino PCB design by swiftrax, published on GitHub under the GPL-2.0 license. It is a 2-layer board measuring 323.9 × 95.1 mm, with 104 components from 55 distinct parts.

Its main chip is the ATmega32U4-AU, from the AVR/Arduino family. By type, the board carries 44 LEDs, 44 diodes, 6 resistors, 5 capacitors, 1 IC and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

Ergo 40% mechanical keyboard with all components on the top with diodes arranged in an array

Capactiors and Resistors are 0805 Package size

This repository is under the GNU GPL V2 license. If you plan to sell these pcbs, make sure to read it.

UnSplit, from the project README
From the project README

Main components on the UnSplit

ATmega32U4-AU

UnSplit bill of materials (BOM)

104 components, 55 distinct parts.

QtyPartRefs
1
ATmega32U4-AU
U1
1
16MHz
Y1
1
USB2_C_Receptacle
J1
1
500mA
F1
1
Reset
SW1
2
ESC
K_1, K_40
1
Q
K_2
1
W
K_3
1
E
K_4
1
R
K_5
1
T
K_6
1
Y
K_7
1
U
K_8
1
I
K_9
1
O
K_10
1
P
K_11
1
Pipe
K_12
1
Tab
K_13
1
A
K_14
1
S
K_15
Show 35 more
QtyPartRefs
1
D
K_16
1
F
K_17
1
G
K_18
1
H
K_19
1
J
K_20
1
K
K_21
1
L
K_22
1
Colon
K_23
1
Quote
K_24
1
Shift
K_25
1
Z
K_26
1
X
K_27
1
C
K_28
1
V
K_29
1
B
K_30
1
N
K_31
1
M
K_32
1
Dot
K_33
1
Comma
K_34
1
Question
K_35
1
Minus
K_36
1
Win
K_37
1
Del
K_38
1
FN
K_39
1
Enter
K_41
1
Space
K_42
1
Backspace
K_43
1
Alt
K_44
44
D
D1, D2, D3, D4, D5, D6, D7, D8 +36
1
1uF
C1
3
0.1uF
C2, C3, C4
1
10uF
C5
2
10k
R1, R6
2
5.1k
R2, R3
2
22
R4, R5

UnSplit design files

The KiCad project lives in the swiftrax/UnSplit repository on GitHub; these links point at the commit this page was built from.

UnSplit: common questions

What microcontroller does the UnSplit use?

The UnSplit is built around the ATmega32U4-AU, from the AVR/Arduino family.

How big is the UnSplit PCB?

The UnSplit measures 323.9 × 95.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the UnSplit?

104 components, from 55 distinct parts. The full bill of materials is listed on this page.

Where can I download the UnSplit design files?

From the swiftrax/UnSplit repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the UnSplit design in my own project?

Yes, under the terms of its GPL-2.0 license, which swiftrax chose for the repository.

Can I test firmware for the UnSplit without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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