HardLabs

Eightu

calvin-mcd·Eightu·Project/Eightu.kicad_pcb

Eightu PCB layout, top view — open source STM32 board by calvin-mcd

About the Eightu PCB

Eightu is an open source STM32 PCB design by calvin-mcd, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 250.9 × 79.4 mm, with 60 components from 9 distinct parts.

Its main chip is the STM32F072CBT6, from the STM32 family. Other key parts include the XC6206PXXXMR-REGULATOR_LINEAR. By type, the board carries 46 diodes, 9 capacitors, 2 ICs, 1 connector, 1 switch and 1 resistor.

It belongs with the keyboards designs in this gallery.

From the project

stagger & ortho pcbs for the EIGHTU keyboard by @obobobobo!

These are stagger & ortho pcbs for the Eightu by @obobobobo! Eightu is a 13.25u 40% keyboard. It features an island spacebar with 8u spacebar support (and many different bottom row options), usbc daughterboard, arrow cluster, 7degree typing angle, tadpole mount, m4 screws and big bezels.

Please beware!!! The staggered pcb has been fully tested and is working. The ortho version has not been fully tested.

Eightu, from the project README
From the project README

Main components on the Eightu

STM32F072CBT6XC6206PXXXMR-REGULATOR_LINEAR

Eightu bill of materials (BOM)

60 components, 9 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
STM32F072CBT6
U1
1
XC6206PXXXMR-REGULATOR_LINEAR
XC6206PxxxMR-Regulator_Linear
U2
1
C588524
Pico EZmate
J2
1
SKQGABE010
SW6
46
C81598
D_Small
D1, D2, D3, D4, D5, D6, D7, D8 +38
6
100NF
100nF
C1, C2, C3, C4, C5, C7
1
10UF
10uF
C6
2
1UF
1uF
C8, C9
1
10K
10k
R1

Eightu design files

The KiCad project lives in the calvin-mcd/Eightu repository on GitHub; these links point at the commit this page was built from.

Eightu: common questions

What microcontroller does the Eightu use?

The Eightu is built around the STM32F072CBT6, from the STM32 family.

How big is the Eightu PCB?

The Eightu measures 250.9 × 79.4 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Eightu?

60 components, from 9 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 Eightu design files?

From the calvin-mcd/Eightu 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 Eightu 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 Eightu 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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