HardLabs

Choctopus44

SlightHeadache·choctopus44·kicad/ver2.0/pcb/choctopus44.kicad_pcb

Choctopus44 PCB layout, top view — open source AVR/Arduino board by SlightHeadache

About the Choctopus44 PCB

Choctopus44 is an open source AVR/Arduino PCB design by SlightHeadache, published on GitHub under the MIT license. It is a 2-layer board measuring 247.4 × 121.4 mm, with 102 components from 10 distinct parts.

Its main chip is the ProMicro/Nice!Nano, from the AVR/Arduino family. By type, the board carries 45 switches, 45 diodes, 4 resistors, 2 jumpers, 2 capacitors and 1 IC.

It belongs with the keyboards and iot & wireless designs in this gallery.

From the project

Choctopus44 is a custom low profile keyboard

Choctopus44 is low profile, Choc spaced, optionally hotswappaple 44-key column staggered keyboard with a rotary encoder. It is loosely based on gtips's REVIUNG project, specifically REVIUNG41, but has deviated from it significantly during its development.

While all the main issues of the original Choctopus44 prototypes were addressed during the development of v2, some new minor arose during it's development.

Choctopus44, from the project README
From the project README

Main components on the Choctopus44

ProMicro/Nice!Nano

Choctopus44 bill of materials (BOM)

102 components, 10 distinct parts.

QtyPartRefs
1
ProMicro/Nice!Nano
U1
1
Battery_Cell
BT1
2
SolderJumper_2_Open
JP1, JP2
1
SW_PUSH
RESET1
44
SW_PUSH
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +36
1
Rotary_Encoder_Switch
SW45
1
SW_DPST
SW_PWR1
45
1N4148W
D1, D2, D3, D4, D5, D6, D7, D8 +37
2
C
C1, C2
4
R
R1, R2, R3, R4

Choctopus44 design files

The KiCad project lives in the SlightHeadache/choctopus44 repository on GitHub; these links point at the commit this page was built from.

Choctopus44: common questions

What microcontroller does the Choctopus44 use?

The Choctopus44 is built around the ProMicro/Nice!Nano, from the AVR/Arduino family.

How big is the Choctopus44 PCB?

The Choctopus44 measures 247.4 × 121.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Choctopus44?

102 components, from 10 distinct parts. The full bill of materials is listed on this page.

Where can I download the Choctopus44 design files?

From the SlightHeadache/choctopus44 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Choctopus44 design in my own project?

Yes, under the terms of its MIT license, which SlightHeadache chose for the repository.

Can I test firmware for the Choctopus44 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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