https://blog.adafruit.com/?s=%23OHM2019
there are millions of open-source hardware devices out there, so "popular" would need to be more defined for this question, etc. here are all the posts..
[1] https://blog.adafruit.com/2019/10/28/ask-hn-why-isnt-open-so...
https://blog.adafruit.com/?s=%23OHM2019
there are millions of open-source hardware devices out there, so "popular" would need to be more defined for this question, etc. here are all the posts..