I built these a few years ago to let me use UNO shields with Pro Minis to speed up prototyping. This was an early version. Later versions had more and more features added until I didn’t need the shields anymore. That’s when my Pro Mini Backplane was born.
These are genius. Very well done.
Thanks. It was a silly project that just kept getting sillier and sillier until it actually became useful and I replaced it.