Since @shannond is working on this I guess the classic Public Lab and Safecast examples are already on your radar.
On top of the other excellent examples here, I suggest Fieldkit and @shicks’s EnviroDIY data logger.
Also, I’d like to highlight @TheCavePearlProject’s Cave Pearl Project developing an underwater data logger. To me, it is remarkable for it’s extensive documentation on the process of developing such a platform with text/images/videos, such as in this extensive thread or on their website. I was super impressed by the updates they’ve given on the project here in the GOSH forum since 2018!