So, way back in early March, I effectively "finished" this project. It's likely I'll revisit it in the future to do some more nifty things, but for now, it's been in my wife's system and working well.

The parts list has been updated to match the final product, and the latest code has been uploaded to the GitLab project. (it's actually been there since March 2nd)

The Future

There's a few things I'd still like to do in the future, when I get a chance to revisit this. (i.e., after we move into the new place and get settled, and maybe after I finish my soldering iron)

• Add a buzzer/alarm to warn you when a given temperature threshold has been reached
• Add some actual mounting so the OLED display isn't just floating on its wires
• Fan/pump speed control! (right now I think everything is directly powered, so there's no control, only sensing)
• Lighting effects! (right now the RGB lights are just hard-wired to show red)
• Maybe a printed circuit board?