HardLabs

Hub20

joshajohnson·Hub20·hardware/1.0.1/Hub20.kicad_pcb

Hub20 PCB layout, top view — open source STM32 board by joshajohnson

About the Hub20 PCB

Hub20 is an open source STM32 PCB design by joshajohnson, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 89 × 124 mm, with 172 components from 29 distinct parts.

Its main chip is the STM32F072C8Tx, from the STM32 family. Other key parts include the AP2112K-3.3, USBLC6-2SC6 and CY7C65632-28LTXCT. By type, the board carries 58 capacitors, 51 diodes, 21 switches, 13 resistors, 7 ICs and 6 LEDs.

It belongs with the keyboards designs in this gallery.

From the project

Hub20 is a numpad with a bunch of features you never knew you needed.

Hub20 is a numpad with a bunch of features you never knew you needed. They include:

- Left and Right handed layouts supported, along with a 4x5 1U grid enabling it to be used as a macropad. - Two rotary encoders, enabling intuitive controls for a wide range of tools including CAD and photo / video editing. - Inbuilt USB 2.0 Hub with Type-C connectors, allowing connection to other keyboards, memory sticks, wireless receivers and more! - VIA and QMK compatibility, including a "macro" mode enabling the keys to be remapped on a host computer. - 27 addressable RGB leds, including one under each…

Hub20, from the project README
From the project README

Main components on the Hub20

AP2112K-3.3USBLC6-2SC6STM32F072C8TxCY7C65632-28LTXCT

Hub20 bill of materials (BOM)

172 components, 29 distinct parts.

QtyPartRefs
1
AP2112K-3.3
U1
4
USBLC6-2SC6
U2, U6, U7, U8
1
STM32F072C8Tx
U3
1
CY7C65632-28LTXCT
U5
1
DTC123J
Q1
1
BSS138
Q2
1
12MHz
Y1
4
USB_C_Receptacle_USB2.0
J1, J2, J3, J4
1
1A
F1
3
500mA
F2, F3, F4
1
EVQPUL
SW1
20
MX_RGB
SW2, SW3, SW4, SW5, SW6, SW8, SW9, SW10 +12
2
2U
MX1, MX2
4
2U
MX3, MX4, MX5, MX6
23
1N4148
D1, D4, D5, D6, D7, D8, D10, D11 +15
7
WS2812B
D2, D3, D9, D15, D17, D23, D30
20
SK6812MINI-E
D31, D33, D34, D35, D36, D37, D38, D39 +12
1
LED
D32
5
600R
FB1, FB2, FB3, FB4, FB5
44
100n
C1, C4, C5, C6, C7, C8, C9, C11 +36
Show 9 more
QtyPartRefs
8
1u
C10, C19, C28, C32, C34, C54, C55, C57
3
10u
C14, C20, C41
1
4u7
C18
2
15p
C44, C45
3
5K1
R2, R3, R14
1
100K
R4
5
10K
R5, R6, R7, R8, R9
1
649R
R10
3
10K
RN1, RN2, RN3

Hub20 design files

The KiCad project lives in the joshajohnson/Hub20 repository on GitHub; these links point at the commit this page was built from.

Hub20: common questions

What microcontroller does the Hub20 use?

The Hub20 is built around the STM32F072C8Tx, from the STM32 family.

How big is the Hub20 PCB?

The Hub20 measures 89 × 124 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Hub20?

172 components, from 29 distinct parts. The full bill of materials is listed on this page.

Where can I download the Hub20 design files?

From the joshajohnson/Hub20 repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Hub20 design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which joshajohnson chose for the repository.

Can I test firmware for the Hub20 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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