HardLabs

Choc40

rainkeebs·Choc40

Choc40 PCB layout, top view — open source AVR/Arduino board by rainkeebs

About the Choc40 PCB

Choc40 is an open source AVR/Arduino PCB design by rainkeebs, published on GitHub under the Unlicense license. It is a 2-layer board measuring 216 × 70.8 mm, with 98 components from 19 distinct parts.

Its main chip is the ATMEGA32U2-MU, from the AVR/Arduino family. By type, the board carries 41 switches, 41 diodes, 7 resistors, 5 capacitors, 1 IC and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

40% Low profile keyboard designed for Kailh 'Choc' v1 switches and MBK Extended keycaps.

These files were made in KiCad nightly. They are not backwards compatible. 40% Low profile keyboard designed for Kailh 'Choc' v1 switches and MBK Extended keycaps.

Choc40, from the project README
From the project README

Main components on the Choc40

ATMEGA32U2-MU

Choc40 bill of materials (BOM)

98 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
ATMEGA32U2-MU
ATmega32U2-MU
U1
1
Resonator_Small
Y1
1
500MA
500mA
F1
32
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +24
5
SW_Push
SW13, SW34a1, SW35, SW39, SW40
2
SW_Push
SW23, SW24
1
SW_Push
SW38
1
SW_Push
SW99
1
HRO-TYPE-C-31-M-12
USB1
40
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +32
1
PRTR5V0U2X
D41
1
1UF
1uF
C1
2
0.1UF
0.1uF
C2, C3
1
10UF
10uF
C4
1
4.7N
4.7n
C5
2
10K
10k
R1, R4
2
22
R2, R3
2
5K1
5k1
R5, R6
1
1M
R7

Choc40 design files

The KiCad project lives in the rainkeebs/Choc40 repository on GitHub; these links point at the commit this page was built from.

Choc40: common questions

What microcontroller does the Choc40 use?

The Choc40 is built around the ATMEGA32U2-MU, from the AVR/Arduino family.

How big is the Choc40 PCB?

The Choc40 measures 216 × 70.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Choc40?

98 components, from 19 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 Choc40 design files?

From the rainkeebs/Choc40 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 Choc40 design in my own project?

Yes, under the terms of its Unlicense license, which rainkeebs chose for the repository.

Can I test firmware for the Choc40 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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