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Usb proto

brainsmoke·usb_proto·pcb/usb_proto/project.kicad_pcb

Usb proto PCB layout, top view — open source STM32 board by brainsmoke
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About the Usb proto PCB

Usb proto is an open source STM32 PCB design by brainsmoke, published on GitHub under the CC-BY-4.0 license. It is a 2-layer board measuring 77 × 47 mm, with 80 components from 17 distinct parts.

Its main chip is the STM32F042G6Ux, from the STM32 family. Other key parts include the AP2112K-3.3 and USBLC6-2P6. By type, the board carries 57 connectors, 8 resistors, 4 switches, 4 diodes, 4 capacitors and 3 ICs.

It belongs with the usb & debug tools, keyboards and dev boards & breakouts designs in this gallery.

From the project

This repository contains a few boards aimed at rapid prototyping.

This repository contains a few boards aimed at rapid prototyping.

The main idea is to save time by providing often-used components and a microcontroller that can act as a USB-serial to UART (usb-cdc-acm) device, a HID keyboard/keypad or run other simple programs.

usbserial USB serial to UART adapter firmware, with RTS/DTR signals & reset/boot signals for directly programming ESP32s. usbhidkeymatrix USB HID Keypad firmware, for a keyboard matrix (max. 16 keys) usbhidkeymatrix USB HID Keypad firmware, for a keyboard matrix (max. 25 keys) usbhidsimple USB HID Keypad firmware for a few buttons…

Usb proto, from the project README
From the project README

Main components on the Usb proto

STM32F042G6UxAP2112K-3.3USBLC6-2P6

Usb proto bill of materials (BOM)

80 components, 17 distinct parts.

QtyPartRefs
1
STM32F042G6Ux
U1
1
AP2112K-3.3
U2
1
USBLC6-2P6
U3
1
USB_C_Receptacle_USB2.0
J1
4
Conn_01x21_Pin
J2, J3, J4, J5
42
Conn_01x07_Pin
J6, J7, J8, J9, J10, J11, J12, J13 +34
1
Conn_01x10_Pin
J38
1
~
J39
6
Conn_01x01_Pin
J40, J41, J42, J43, J44, J45
1
Conn_01x02_Pin
J46
1
Conn_01x04_Pin
J57
4
SW_SPST
SW1, SW2, SW3, SW4
4
LED
D1, D2, D3, D4
4
1uF
C1, C2, C3, C4
4
5.1k
R1, R2, R3, R8
1
1k
R4
3
330R
R5, R6, R7

Usb proto design files

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

Usb proto: common questions

What microcontroller does the Usb proto use?

The Usb proto is built around the STM32F042G6Ux, from the STM32 family.

How big is the Usb proto PCB?

The Usb proto measures 77 × 47 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Usb proto?

80 components, from 17 distinct parts. The full bill of materials is listed on this page.

Where can I download the Usb proto design files?

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

Can I use the Usb proto design in my own project?

Yes, under the terms of its CC-BY-4.0 license, which brainsmoke chose for the repository.

Can I test firmware for the Usb proto 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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