HardLabs

Squash hardware

KoBussLLC·squash-hardware·PCB/squash.kicad_pcb

Squash hardware PCB layout, top view — open source STM32 board by KoBussLLC
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About the Squash hardware PCB

Squash hardware is an open source STM32 PCB design by KoBussLLC, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 247.7 × 101.6 mm, with 65 components from 22 distinct parts.

Its main chip is the STM32F072V8Tx, from the STM32 family. Other key parts include the AMS1117-3.3. By type, the board carries 45 switches, 7 resistors, 4 connectors, 3 diodes, 2 ICs and 2 capacitors.

It belongs with the keyboards and displays & leds designs in this gallery.

From the project

40% Mecahnical Keyboard PCB and case

Small keyboard for big brains with lots of layers 🤏 ⌨️ 🧠 🍰

This keyboard uses an acrylic case, POM switch-plate, and PCB mounted switches and stabilizers.

See Squash's bigger brother for build instructions and additional information.

Keyboard Layout Editor Permalink for layout options.

A standard keycap set can be used as long as each "row" has the same profile and a 1.75u right shift key is included.

Squash hardware, from the project README
From the project README

Main components on the Squash hardware

STM32F072V8TxAMS1117-3.3

Squash hardware bill of materials (BOM)

65 components, 22 distinct parts.

QtyPartRefs
1
STM32F072V8Tx
U1
1
AMS1117-3.3
U2
1
SSD1306
J1
1
Conn_01x05
J2
2
Conn_01x02
J3, J4
1
Rotary_Encoder_Switch
ROT_ENC1
2
1.50u
SW1, SW12
32
1.00u
SW2, SW3, SW4, SW5, SW6, SW7, SW8, SW9 +24
1
1.75u_stepped_caps_lock
SW13
2
2.25u
SW23, SW43
1
1.75u
SW33
1
2.25u_or_1.25and1.00
SW34
4
1.25u
SW35, SW39, SW41, SW42
1
6.25u
SW38
1
2.75u
SW45
1
USB_C_Receptacle_USB2.0
USBC1
1
LED_R
D1
1
LED_G
D2
1
LED_B
D3
2
10uF
C1, C2
Show 2 more
QtyPartRefs
4
5.1k
R1, R2, R3, R4
3
120
R5, R6, R7

Squash hardware design files

The KiCad project lives in the KoBussLLC/squash-hardware repository on GitHub; these links point at the commit this page was built from.

Squash hardware: common questions

What microcontroller does the Squash hardware use?

The Squash hardware is built around the STM32F072V8Tx, from the STM32 family.

How big is the Squash hardware PCB?

The Squash hardware measures 247.7 × 101.6 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Squash hardware?

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

Where can I download the Squash hardware design files?

From the KoBussLLC/squash-hardware repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Squash hardware design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

Can I test firmware for the Squash hardware 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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