HardLabs

Keybrain

cbiffle·keybrain

Keybrain PCB layout, top view — open source STM32 board by cbiffle
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About the Keybrain PCB

Keybrain is an open source STM32 PCB design by cbiffle, published on GitHub. It is a 2-layer board measuring 55.4 × 33 mm, with 22 components from 15 distinct parts.

Its main chip is the STM32L422CBTx, from the STM32 family. Other key parts include the MIC5205-3.3YM5 and TC74VHC238F. By type, the board carries 8 capacitors, 5 resistors, 3 ICs, 2 transistors and 2 connectors.

It belongs with the keyboards designs in this gallery.

From the project

Drop-in replacement controller for WASD CODE v2B keyboard

Main components on the Keybrain

STM32L422CBTxMIC5205-3.3YM5TC74VHC238F

Keybrain bill of materials (BOM)

22 components, 15 distinct parts.

QtyPartRefs
1
STM32L422CBTx
U101
1
MIC5205-3.3YM5
U102
1
TC74VHC238F
U103
1
ZXTN08400BFF
Q101
1
ZXTP25020CFFTA
Q102
1
Conn_ARM_JTAG_SWD_10
J101
1
OLED
J103
2
Molex0877582416
H201, H202
5
0µ1
C101, C102, C103, C104, C106
1
10µ
C107
1
470p
C108
1
2µ2 tant
C109
2
1k
R101, R102
2
180
R103, R104
1
10k
R105

Keybrain design files

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

Keybrain: common questions

What microcontroller does the Keybrain use?

The Keybrain is built around the STM32L422CBTx, from the STM32 family.

How big is the Keybrain PCB?

The Keybrain measures 55.4 × 33 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Keybrain?

22 components, from 15 distinct parts. The full bill of materials is listed on this page.

Where can I download the Keybrain design files?

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

Can I use the Keybrain design in my own project?

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

Can I test firmware for the Keybrain without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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