HardLabs

Base

google·mozc-devices·mozc-yunomi/board/base/base.kicad_pcb

Base PCB layout, top view — open source STM32 board by google

About the Base PCB

Base is an open source STM32 PCB design by google, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 52.3 × 52.3 mm, with 36 components from 13 distinct parts.

Its main chip is the STM32F042F4PX, from the STM32 family. By type, the board carries 26 connectors, 5 capacitors, 3 resistors, 1 IC and 1 crystal.

It belongs with the keyboards designs in this gallery.

From the project

Circuit diagrams and firmware source code for Gboard DIY keyboards

This contains programs, schematics and board layouts for Gboard Yunomi version, which was released on Oct 1, 2021.

This is not an officially supported Google product.

- firmware/ : Arduino sketch. - board/ : KiCad schematics and PCB layouts. - jig.stl : A jig for building the keyboards. - ../third_party/mozc-yunomi/keyswitches.pretty : Footprint data for the key switches.

Base, from the project README
From the project README

Main components on the Base

STM32F042F4PX

Base bill of materials (BOM)

36 components, 13 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F042F4PX
ATmega32U4-AU
U1
1
16MHz
Y1
10
Conn_01x02_Male
J1, J4, J5, J6, J7, J8, J9, J10 +2
2
C2845571
Conn_01x02_Male
J2, J3
1
Conn_01x04_Male
J13
1
Conn_02x03_Odd_Even
J14
12
Conn_01x01_Male
J15, J16, J17, J18, J19, J20, J21, J22 +4
1
0.1U
0.1uF
C1
1
1uF
C2
3
C
C3, C4, C5
1
510
10K
R1
1
510
22
R2
1
22
R3

Base design files

The KiCad project lives in the google/mozc-devices repository on GitHub; these links point at the commit this page was built from.

Base: common questions

What microcontroller does the Base use?

The Base is built around the STM32F042F4PX, from the STM32 family.

How big is the Base PCB?

The Base measures 52.3 × 52.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Base?

36 components, from 13 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 Base design files?

From the google/mozc-devices repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Base design in my own project?

Yes, under the terms of its Apache-2.0 license, which google chose for the repository.

Can I test firmware for the Base 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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