4 open source boards using the A3921
Real designs built with the A3921, from public GitHub projects: a quick way to see how others power, decouple and connect it. Each board comes with its KiCad files, full parts list and a render — and you can simulate its firmware on HardLabs.
MoterDriver v1
issaimaru
65.7 × 51 mm58 partsApache-2.05
STM32MainCircuit v1
shimotoriharuki
91 × 33 mm168 parts2LNo license0
STM32Top and bottom
91 × 67.7 mm118 parts2LNo license0
MainCircuit v2 bottom
91 × 33 mm86 parts2LNo license0
The A3921 in open source designs
The gallery holds 4 open source boards using the A3921 from 2 GitHub repositories; a typical one measures about 91 × 42 mm and carries around 102 components.
100% are two-layer designs, the rest use four layers or more, and 25% carry an open source license.
The most starred is MoterDriver v1 by issaimaru.
Microcontrollers on boards using the A3921
A3921: common questions
Where can I find a A3921 reference design?
Each of the 4 boards on this page is a real design using the A3921. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
Which microcontrollers do boards using the A3921 use?
Most are built on STM32 (2).
How big is a typical board using the A3921?
The median is 91 × 42 mm, and 100% are two-layer designs.
What is the most popular open source board using the A3921?
By GitHub stars, MoterDriver v1 by issaimaru, with 5 stars.
Can I simulate one of these boards using the A3921 before building it?
Yes. HardLabs turns a board's netlist and BOM into a working simulation, so you can boot and test firmware against it with no hardware on your desk.