I'm building a "smart garden" - which is really nothing more than moisture and temperature sensors on each of my garden beds / planters hooked up to Raspberry Pis. Each Pi will be connected to a switch and powered by that switch (using PoE), so I need to connect the switch to the Pi with ethernet cable carrying between 48 and 57 VDC.
To try to shorten the story, I need to run conduit between the central switch location and the garden beds / planters. It will mostly be alongside the house; I intend to bury it instead of having the conduit run along the outside. Can I use EMT conduit for this? Can I use PVC? If both, which one would be the better solution?