Hi Sedhead, thanks for sharing. I’m just heading out the door for a weekend camping, and so a quick comment.
I’m not affiliated at all with the EnviroDiy – but I wonder if you’ve looked at the Mayfly. The benefit is that there is just the type of experience on this board for that device and software. I would think the key software you want to verify is the ability to store data on a SD card with accurate time. The SD card file system can be a challenge if not verified.
A place to start with a field deployable project, how do you plan on environmentally protecting it, powering it (solar, replaceable batteries), and then testing and updating it in the field?
Also you may want to discuss the depth range you want to measure. Unfortunately pressure sensors/depth readings can be temperature dependent – so from a teaching point of view its a good idea to teach measurement traceability. For using two absolute pressure sensors, Onset Hobo propose this scenario, but it doubles the error. A colleague who has used the approach has found burying the atmospheric reference sensor keeps it in a stable temperature environment.
PublicLabs has also done a discussion on some aspects of water measuring. They have a riffle device that may be worth looking at.
https://publiclab.org/wiki/openhour-archive March 6
Back after camping.