Here are a couple things.
The SDI-12 data line on this sensor, I’ll bet, is a 5 volt signal (check this first of course). All the SDI-12 stuff I’ve interacted with has a ~12v supply, but the data line is 0-5volt. The Arduino SDI-12 library works great. The EnviroDIY folks are good, if understaffed and focused on more things than supporting their hardware…but such is the nature of the open source world.
For a dev. board, I would go with the RocketScream Ultra. I just got a couple and they’re awesome and super easy to get set up with TTN. There is even a guide for it. These boards are also built around an ARM processor, so they’re cheaper, more powerful, and can do a lot more stuff than the old ATMega’s. You can’t supply it directly with 12 volts, but you can find 5v DC/DC converters for cheap from any electronics supplier depending on your country. Something like this. Then you’ll need a level converter to convert the 5v data signal to a 3.3v data signal so you don’t damage the inputs of your dev. board/arduino thing. They’re super easy to make with a mosfet and a couple resistors here is a quick explanation.
That’s a lot of stuff, let me know if you have more questions.
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