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.
Is this the backplane of which you are referring to?
https://old.reddit.com/r/arduino/comments/itx05n/here_is_my_diy_arduino_promini_backplane_and_some/
One and the same.
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.
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