HardLabs

Type c

google·mozc-devices·mozc-bar/board/type-c/type-c.kicad_pcb

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

About the Type c PCB

Type c 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 188 × 30 mm, with 17 components from 9 distinct parts.

Its main chip is the STM32F042F4PX, from the STM32 family. By type, the board carries 7 switches, 2 connectors, 2 resistors, 1 IC and 1 capacitor.

It belongs with the keyboards designs in this gallery.

From the project

Circuit diagrams and firmware source code for Gboard DIY keyboards

This directory contains programs, schematics and board layouts for Gboard Bar version, which was released on Oct 1, 2022.

This is not an officially supported Google product.

- board/ : KiCad schematics and PCB layouts. - case/ : STL file for case. - firmware/ : Arduino sketch.

- Cherry MX (or compatible) key x 101 - Stabilizer 2u x 7 - Stabilizer 6.25u x 1 - 74HC165 x 16 - Resistor 100kOhm x 16 - Resistor network 100kOhm x 16 - Capacitor 0.1uF x 16 - 2 row 3 column right angle 2.54mm pin headers x 16 (Cut from this) - 2 row 3 column right angle 2.54mm pin header sockets x 16 (Cut from…

Type c, from the project README
From the project README

Main components on the Type c

STM32F042F4PX

Type c bill of materials (BOM)

17 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F042F4PX
74HC165
U1
1
Conn_01x06_Female
J1
1
C2845571
Conn_01x06_Male
J2
2
MountingHole
H2, H4
2
MountingHole
H3, H5
7
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7
1
0.1U
C
C1
1
510
100k
R1
1
100k
RN1

Type c 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.

Type c: common questions

What microcontroller does the Type c use?

The Type c is built around the STM32F042F4PX, from the STM32 family.

How big is the Type c PCB?

The Type c measures 188 × 30 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Type c?

17 components, from 9 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 Type c 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 Type c 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 Type c 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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