HardLabs

Cpm43

Gtrx0·cpm43

Cpm43 PCB layout, top view — open source AVR/Arduino board by Gtrx0
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About the Cpm43 PCB

Cpm43 is an open source AVR/Arduino PCB design by Gtrx0, published on GitHub under the CERN-OHL-1.2 license. It is a 2-layer board measuring 232.2 × 76.7 mm, with 184 components from 28 distinct parts.

Its main chip is the ATmega32U4, from the AVR/Arduino family. Other key parts include the PRTR5V0U2X. By type, the board carries 47 resistors, 43 diodes, 21 capacitors, 14 LEDs, 2 ICs and 1 transistor.

It belongs with the keyboards designs in this gallery.

From the project

40% mechanical keyboard with rgb underglow and single color backlight

Cpm43, from the project README
From the project README

Main components on the Cpm43

ATmega32U4PRTR5V0U2X

Cpm43 bill of materials (BOM)

184 components, 28 distinct parts.

QtyPartRefs
1
ATmega32U4
U1
1
PRTR5V0U2X
U2
1
Q_NPN_BCE
Q1
1
Crystal_GND24
X1
1
Conn_01x04
J1
1
500mA Hold
F1
33
MX-1U
MX1, MX2, MX3, MX4, MX5, MX6, MX7, MX8 +25
1
MX-1.25U
MX13
1
MX-1.75U
MX23
1
MX-1.5U
MX24
1
MX-1.25U
MX34
5
MX-1.25U
MX35, MX36, MX37, MX39, MX40
1
MX-2.75U
MX38
1
2x3 SPI
SPI1
1
SW_PUSH
SW1
2
22
UR1, UR2
2
5.1k
UR3, UR4
1
1M
UR5
1
HRO-TYPE-C-31-M-12
USB1
2
22pF
XC1, XC2
Show 8 more
QtyPartRefs
14
WS2812B
LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 +6
43
D
D1, D2, D3, D4, D5, D6, D7, D8 +35
18
0.1uf
C1, C2, C3, C5, C9, C10, C11, C12 +10
2
4.7uF
C4, C7
1
1uF
C6
1
1.5k
NPNR1
2
10k
R1, R2
44
470
R3, R4, R5, R6, R7, R8, R9, R10 +36

Cpm43 design files

The KiCad project lives in the Gtrx0/cpm43 repository on GitHub; these links point at the commit this page was built from.

Cpm43: common questions

What microcontroller does the Cpm43 use?

The Cpm43 is built around the ATmega32U4, from the AVR/Arduino family.

How big is the Cpm43 PCB?

The Cpm43 measures 232.2 × 76.7 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Cpm43?

184 components, from 28 distinct parts. The full bill of materials is listed on this page.

Where can I download the Cpm43 design files?

From the Gtrx0/cpm43 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Cpm43 design in my own project?

Yes, under the terms of its CERN-OHL-1.2 license, which Gtrx0 chose for the repository.

Can I test firmware for the Cpm43 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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