For the next revision, [Andrew] added buttons and decided to make it into a Raspberry Pi HAT. This HAT is essentially ... Despite the data sheet calling for 4.5 to 5.5 V, the setup worked fine.

Power over Ethernet (PoE) is nothing new to the Raspberry Pi. Introduced with the Raspberry Pi 3B+, PoE provides power over a network connection and is handy for installing a Raspberry Pi in a ...