I am going a tad mad on circuit boards of late, and a lot of them are "field of dreams" with the hope that if I build them they will come (and buy some).
All on my shop site (plug, plug) https://shop.revk.uk
But apart from the plug, always interested in ideas.
I think I may steer towards more GPS stuff, as I said, but ideas always welcome. Playing with battery and RTC wake up is a fun thing.
Always keen to incrementally add to my toolkit of bits for circuits.