Power over Ethernet or PoE is one of those things that sound difficult but actually at its simplest is very easy to use and a great way to reduce the number of cables.
If you look next to the ‘L’ of Altoids, you can see the lens of a Luxeon LED poking through. What author have here is a modification of web morse flasher project described in his earlier blog about the EtherTen. The EtherTen is a combined Arduino and Ethernet board.
By using PoE he could mount his useful messenger device on the wall, with only a single wire coming out of it (the Ethernet cable). This would provide both power and network connection.
The module he used to accomplish this magic trick is the Freetronics 4-Channel Power-over-Ethernet Midspan Injector.
Tags : 2101201, W5100, POE, EtherTen
Author : Simon Monk