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Humla

jimmerricks·humla·pcb/humla.kicad_pcb

Humla PCB layout, top view — open source AVR/Arduino board by jimmerricks
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About the Humla PCB

Humla is an open source AVR/Arduino PCB design by jimmerricks, published on GitHub under the MIT license. It is a 2-layer board measuring 210.2 × 94.3 mm, with 77 components from 7 distinct parts.

Its main chip is the ProMicro, from the AVR/Arduino family. By type, the board carries 38 switches, 36 diodes, 1 IC and 1 battery holder.

It belongs with the keyboards designs in this gallery.

From the project

The Humla is a 36-key low profile keyboard based on the Reviung by gtips and the Rev-lp by cyril279. It is for choc switches (with 18x17mm spacing) and has basic support for bluetooth pro micro alternatives such as the nRFMicro. Humla means blumblebee in Swedish.

The Humla is a 36-key low profile keyboard based on the Reviung by gtips and the Rev-lp by cyril279. It is for choc switches (with 18x17mm spacing) and has basic support for bluetooth pro micro alternatives such as the nRFMicro. Humla means blumblebee in Swedish.

- Basic case with cover by @zzeneg - Laptop adapter and bumper by @Lenbok

Humla, from the project README
From the project README

Main components on the Humla

ProMicro

Humla bill of materials (BOM)

77 components, 7 distinct parts.

QtyPartRefs
1
ProMicro
U1
1
Battery_Cell
BT1
36
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +28
1
Reset
SW37
1
SW_SPDT
SW38
1
h2
h2
36
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +28

Humla design files

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

Humla: common questions

What microcontroller does the Humla use?

The Humla is built around the ProMicro, from the AVR/Arduino family.

How big is the Humla PCB?

The Humla measures 210.2 × 94.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Humla?

77 components, from 7 distinct parts. The full bill of materials is listed on this page.

Where can I download the Humla design files?

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

Can I use the Humla design in my own project?

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

Can I test firmware for the Humla 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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