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Macrolev

heiso·macrolev·kicad/Rev 1.0/macrolev.kicad_pcb

Macrolev PCB layout, top view — open source STM32 board by heiso
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About the Macrolev PCB

Macrolev is an open source STM32 PCB design by heiso, published on GitHub. It is a 2-layer board measuring 309.6 × 95.3 mm, with 106 components from 21 distinct parts.

Its main chip is the STM32F411CEU6, from the STM32 family. Other key parts include the A1101ELHL and AMS1117-3.3. By type, the board carries 69 ICs, 18 capacitors, 5 resistors, 3 connectors, 2 switches and 2 inductors.

It belongs with the keyboards designs in this gallery.

From the project

Macrolev is an open source analog keyboard powered by Hall Effect switches

I use the two prototypes shown above as my daily drivers for both coding and gaming. They work well, and the current state of the web configurator is sufficient for seamlessly switching between coding and gaming modes. The current layout of my prototypes is Mac ISO azerty (FR).

This is still a work in progress. While the prototypes are functional, building one requires a good understanding of electronics and firmware development. If you're interested in creating your own, please be aware that you'll need experience with PCB assembly, microcontroller programming, and debugging embedded…

Macrolev, from the project README
From the project README

Main components on the Macrolev

A1101ELHLAMS1117-3.3STM32F411CEU6

Macrolev bill of materials (BOM)

106 components, 21 distinct parts — part numbers from the project's BOM.

QtyPartRefs
67
A1101ELHL
U1, U2, U3, U4, U5, U6, U7, U8 +59
1
AMS1117-3.3
U68
1
STM32F411CEU6
U69
1
25MHz/20ppm/15pF
Y1
1
USBC
J1
1
I2C
J2
1
DEBUG
J3
5
CD74HC4067SM
AMUX0, AMUX1, AMUX2, AMUX3, AMUX4
1
RST_BTN
SW1
1
BOOT_BTN
SW2
1
RED
D1
2
120R
FB1, FB2
1
10u
C1
10
100n
C2, C3, C4, C5, C9, C14, C15, C16 +2
1
10n
C6
2
1u
C7, C8
2
22u
C10, C11
2
20p
C12, C13
2
1.2K
R1, R2
2
10k
R3, R4
Show 1 more
QtyPartRefs
1
5.1k
R5

Macrolev design files

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

Macrolev: common questions

What microcontroller does the Macrolev use?

The Macrolev is built around the STM32F411CEU6, from the STM32 family.

How big is the Macrolev PCB?

The Macrolev measures 309.6 × 95.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Macrolev?

106 components, from 21 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 Macrolev design files?

From the heiso/macrolev 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 Macrolev design in my own project?

The repository has no license, so all rights stay with heiso. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Macrolev 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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