HardLabs

Rev2

celcius-plus-273·split-keyboard·rev2/rev2.kicad_pcb

Rev2 PCB layout, top view — open source AVR/Arduino board by celcius-plus-273

About the Rev2 PCB

Rev2 is an open source AVR/Arduino PCB design by celcius-plus-273, published on GitHub. It is a 2-layer board measuring 133.4 × 110.3 mm, with 85 components from 46 distinct parts.

Its main chip is the ATMEGA32U4, from the AVR/Arduino family. By type, the board carries 34 diodes, 33 switches, 8 capacitors, 6 resistors, 2 connectors and 1 IC.

It belongs with the keyboards designs in this gallery.

Main components on the Rev2

ATMEGA32U4

Rev2 bill of materials (BOM)

85 components, 46 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA32U4
ATmega32U4
U101
1
16 MHz
Y101
1
Bluefruit LE
J101
1
JST-PH
J103
1
reset_sw
S101
1
6
SW101
1
7
SW102
1
8
SW103
1
9
SW104
1
0
SW105
1
-
SW106
1
C1
SW107
1
Y
SW108
1
U
SW109
1
I
SW110
1
O
SW111
1
P
SW112
1
BSPC
SW113
1
C2
SW114
1
H
SW115
Show 26 more
QtyPartRefs
1
J
SW116
1
K
SW117
1
L
SW118
1
;
SW119
1
ENT
SW120
1
C3
SW121
1
N
SW122
1
M
SW123
1
,
SW124
1
.
SW125
1
/
SW126
1
RSHIFT
SW127
1
C4
SW128
1
SPC
SW129
1
M1
SW130
1
M2
SW131
1
SUPER
SW132
32
D
D101, D102, D103, D104, D105, D106, D107, D108 +24
2
GREEN
D133, D134
4
0.1UF
0.1uF
C101, C102, C103, C104
1
4.7UF
4.7uF
C105
2
22PF
22pF
C106, C107
1
1UF
1uF
C108
2
10K
10k
R101, R104
2
22
R105, R106
2
1k
R107, R108

Rev2 design files

The KiCad project lives in the celcius-plus-273/split-keyboard repository on GitHub; these links point at the commit this page was built from.

Rev2: common questions

What microcontroller does the Rev2 use?

The Rev2 is built around the ATMEGA32U4, from the AVR/Arduino family.

How big is the Rev2 PCB?

The Rev2 measures 133.4 × 110.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Rev2?

85 components, from 46 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Rev2 design files?

From the celcius-plus-273/split-keyboard repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Rev2 design in my own project?

The repository has no license, so all rights stay with celcius-plus-273. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Rev2 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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