When connecting an Arduino to an Ethernet network it can be really annoying that you need to run two cables to it: one for the LAN, one for power. It’s particularly annoying if you’re going to be putting the Arduino in some strange location with no easy access to power. Wouldn’t it be nice if the Arduino could just draw power from the network connection?
http://www.freetronics.com/pages/power-over-ethernet-for-arduino
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