Raspberry Pi now sells a PoE+ Injector for $25. This device, which adds Power-over-Ethernet functionality to a non-PoE Ethernet switch, requires the use of a PoE HAT and does not come with a power ...
It’s also ridiculously cheap, with a PoE injector adapter (RJ-45 plug & 2.1×5.5 mm power jack to RJ-45 jack) going for about 80 cents, and a DC-DC buck converter that can handle the input of ...