3 open source boards using the R-78E3.3-0.5
Real designs built with the R-78E3.3-0.5, 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.
- schematic only · 223 partsSTM32
OM-64DO
OpenModbus
223 partsGPL-3.020 
STM32Marbles v70
mort13
88.9 × 106.1 mm207 parts2LGPL-3.012
Daisy hardware v1
rafkhan
50.5 × 128.3 mm110 parts4LNo license9
The R-78E3.3-0.5 in open source designs
The gallery holds 3 open source boards using the R-78E3.3-0.5 from 3 GitHub repositories; a typical one measures about 69.7 × 117.2 mm and carries around 207 components.
50% are two-layer designs, the rest use four layers or more, and 67% carry an open source license.
The most starred is OM-64DO by OpenModbus.
Parts used alongside the R-78E3.3-0.5
Microcontrollers on boards using the R-78E3.3-0.5
What boards using the R-78E3.3-0.5 are built for
R-78E3.3-0.5: common questions
Where can I find a R-78E3.3-0.5 reference design?
Each of the 3 boards on this page is a real design using the R-78E3.3-0.5. 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 R-78E3.3-0.5 use?
Most are built on STM32 (2).
How big is a typical board using the R-78E3.3-0.5?
The median is 69.7 × 117.2 mm, and 50% are two-layer designs.
What is the most popular open source board using the R-78E3.3-0.5?
By GitHub stars, OM-64DO by OpenModbus, with 20 stars.
Can I simulate one of these boards using the R-78E3.3-0.5 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.