2 open source boards using the ISO7721DR
Real designs built with the ISO7721DR, 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.
ESP32Clean room slave
trieuhuyduc
165 × 110 mm207 parts2LNo license1
STM32NMEA2000Adapter-8.1
peterantypas
46 × 46 mm52 parts2LGPL-3.0444
The ISO7721DR in open source designs
The gallery holds 2 open source boards using the ISO7721DR from 2 GitHub repositories; a typical one measures about 105.5 × 78 mm and carries around 130 components.
100% are two-layer designs, the rest use four layers or more, and 50% carry an open source license.
The most starred is NMEA2000Adapter-8.1 by peterantypas.
ISO7721DR: common questions
Where can I find a ISO7721DR reference design?
Each of the 2 boards on this page is a real design using the ISO7721DR. 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 ISO7721DR use?
Most are built on ESP32 (1) and STM32 (1).
How big is a typical board using the ISO7721DR?
The median is 105.5 × 78 mm, and 100% are two-layer designs.
What is the most popular open source board using the ISO7721DR?
By GitHub stars, NMEA2000Adapter-8.1 by peterantypas, with 444 stars.
Can I simulate one of these boards using the ISO7721DR 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.