It turned out to be a very interesting project, with plenty of info on how to build an accurate voltage logger ... the folks at Adafruit broke out their Arduino data logging shield to press ...

A new piece of Arduino hardware is now available to purchase from the Adafruit ... Shield can rectify that. Handling all the heavy lifting of connecting to a WiFi network and transferring data ...

Developers, makers and hobbyists interested in data logging applications may be interested in a new Feather and CircuitPython data logging guide created by Adafruit and written by Kattni Rembor.