4 open source boards using the U2
Real designs built with the U2, 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.
STM32Azusa
issaimaru
105 × 137 mm298 parts4LApache-2.09- schematic only · 11 partsAVR/Arduino
VArm6
VJPatz
11 partsMIT2 
LR P3A
Lightiam
167 × 111.2 mm44 parts16LBSD-3-Clause0
Edge io ring evt0
gunnchOS3k
28 × 10 mm14 parts2LMIT0
The U2 in open source designs
The gallery holds 4 open source boards using the U2 from 4 GitHub repositories; a typical one measures about 105 × 111.2 mm and carries around 29 components.
67% use four copper layers or more, and 100% carry an open source license.
The most starred is Azusa by issaimaru.
Microcontrollers on boards using the U2
What boards using the U2 are built for
U2: common questions
Where can I find a U2 reference design?
Each of the 4 boards on this page is a real design using the U2. Open one to see how it is wired up, with the full BOM, a render of the layout and links to its KiCad files.
What parts are used alongside the U2?
The U1, U4, U5, U6 and U10 appear in the most repositories here.
Which microcontrollers do boards using the U2 use?
Most are built on AVR/Arduino (1) and STM32 (1).
How big is a typical board using the U2?
The median is 105 × 111.2 mm, and 33% are two-layer designs.
What is the most popular open source board using the U2?
By GitHub stars, Azusa by issaimaru, with 9 stars.
Can I simulate one of these boards using the U2 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.