Sparkfun DEV-14882 Raspberry Pi PoE HAT
The Raspberry Pi PoE (Power over Ethernet) HAT is a small accessory board for the Raspberry Pi computer. The PoE HAT allows you to power your Raspberry Pi using Power over Ethernet–enabled networks. Please be aware that, for this HAT to work effectively, the network it is connected to needs to have power-sourcing equipment for a 802.3af Power over Ethernet network installed.
No modification to the main Raspberry Pi board is needed for the PoE HAT to work but you will need to ensure that your Pi’s software is up to date for all functionality to be available. The Raspberry Pi PoE HAT is fitted with a small fan that is controlled by the Raspberry Pi via I2C and will turn on and off automatically depending on the temperature of the main processor on your Pi.
NOTE: This HAT is only compatible with Pi3 Model B+ and newer.