Well it's been a long road, and several remote runs of the instrumentation course during COVID didn't help the process because they had to be done without soldering. But I think we've finally arrived at an educational version of the ProMini based logger that has the right mix of software and hardware adaptability to be a real contribution to other STEM educators . After a practice session soldering header pins to perf-board, students can build these and actually deploy them out in the real world. Two breadboards make it easy to align connections with the many different I2C sensor modules on the market provided they aren't too demanding for the little Cr2032 that powers the unit. Memory expansion is nearly effortless with 32k EEprom modules. At between 5-10uA sleep current with those cheap sensor modules attached, you should easily get at least 6 months of operation.
The software is now much more streamlined compared to what we released in 2022, and we moved the LED / sensor cluster around to accommodate the lab activity sequence: