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Shim

dotcypress·shim·kicad/shim.kicad_pcb

Shim PCB layout, top view — open source STM32 board by dotcypress
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About the Shim PCB

Shim is an open source STM32 PCB design by dotcypress, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 40.4 × 22.5 mm, with 26 components from 20 distinct parts.

Its main chip is the STM32G070KBT, from the STM32 family. Other key parts include the LD1117S33TR. By type, the board carries 9 connectors, 5 capacitors, 5 resistors, 3 diodes, 2 ICs and 2 switches.

From the project

Tiny ARM Cortex-M0+ Development/Prototyping board

Tiny ARM Cortex-M0+ Development/Prototyping board.

- USB VBUS, ext. VIN, ext. 5V, ext +3.3V - Push-buttons: User and Reset - LEDs: Power, 2 User LEDs - Connectors: 2 GPIO, 4 PWM, 1 SWD - Breadboard friendly

- Schematics - Gerber files - BOM - KiCad project - Rust firmware for 4-DOF robotic arm toy

- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0) - MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

Shim, from the project README
From the project README

Main components on the Shim

LD1117S33TRSTM32G070KBT

Shim bill of materials (BOM)

26 components, 20 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
LD1117S33TR
U1
1
STM32G070KBT
U2
1
USB_B_Micro
J1
1
PORT1
J2
1
PORT2
J3
1
SWD
J4
1
PWM1
J5
1
PWM2
J6
1
PWM3
J7
1
PWM4
J8
1
Button
J9
1
RST
SW1
1
BTN1
SW2
1
PWR
D1
1
LD1
D2
1
LD2
D3
4
100nF
C1, C3, C4, C5
1
10uF
C2
2
10K
R1, R5
3
330R
R2, R3, R4

Shim design files

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

Shim: common questions

What microcontroller does the Shim use?

The Shim is built around the STM32G070KBT, from the STM32 family.

How big is the Shim PCB?

The Shim measures 40.4 × 22.5 mm, has 2 copper layers and is 1 mm thick.

How many components are on the Shim?

26 components, from 20 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 Shim design files?

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

Can I use the Shim design in my own project?

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

Can I test firmware for the Shim 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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