HardLabs

Pusheenz40

ChrisChrisLoLo·pusheenz40·pcb/sadcatz40/sadcatz40.kicad_pcb

Pusheenz40 PCB layout, top view — open source STM32 board by ChrisChrisLoLo
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About the Pusheenz40 PCB

Pusheenz40 is an open source STM32 PCB design by ChrisChrisLoLo, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 115.4 × 48.1 mm, with 107 components from 15 distinct parts.

Its main chip is the STM32F072C8Tx, from the STM32 family. Other key parts include the USBLC6-2SC6 and XC6206PxxxMR-Regulator_Linear. By type, the board carries 42 switches, 40 diodes, 9 capacitors, 3 ICs, 3 resistors and 1 connector.

It belongs with the keyboards designs in this gallery.

From the project

A pocket keyboard that uses SMD mouse switches. Low profile and easy to assemble

Disclaimer is that this design has very low tolerances for its key switches. You will likely need a 3D printer such as a Bambu Lab A1/A1 mini/P1P/P1S and set the slicing layer resolution to 0.08mm. Printers like the Prusa i3/mini may also work, but have not been tested.

If you want to assemble/order your own PCBAs, come chat in the discord here! https://discord.gg/m8vwnqJEsc

Pusheenz40, from the project README
From the project README

Main components on the Pusheenz40

USBLC6-2SC6STM32F072C8TxXC6206PxxxMR-Regulator_Linear

Pusheenz40 bill of materials (BOM)

107 components, 15 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
USBLC6-2SC6
U1
1
STM32F072C8Tx
U2
1
XC6206PxxxMR-Regulator_Linear
U3
1
USB2_C_Receptacle
J1
1
500mA
F1
8
MountingHole_Pad
H1, H2, H3, H4, H5, H6, H7, H8
40
SW_Push
SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +32
1
BOOT
SW41
1
RST
SW42
40
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +32
5
100nF
C1, C4, C5, C6, C7
1
4.7uF
C2
3
1uF
C3, C9, C10
1
10k
R1
2
5.1k
R2, R3

Pusheenz40 design files

The KiCad project lives in the ChrisChrisLoLo/pusheenz40 repository on GitHub; these links point at the commit this page was built from.

Pusheenz40: common questions

What microcontroller does the Pusheenz40 use?

The Pusheenz40 is built around the STM32F072C8Tx, from the STM32 family.

How big is the Pusheenz40 PCB?

The Pusheenz40 measures 115.4 × 48.1 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pusheenz40?

107 components, from 15 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 Pusheenz40 design files?

From the ChrisChrisLoLo/pusheenz40 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Pusheenz40 design in my own project?

Yes, under the terms of its GPL-3.0 license, which ChrisChrisLoLo chose for the repository.

Can I test firmware for the Pusheenz40 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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