I'm currently in the midst of modifying an old British pelican (pedestrian) crossing to work as a doorbell in my house. Over the weekend I managed to get two-way RF communication working between the units, after a bunch of problems with boards (including micro USB sockets snapping off both the Iteaduino Lites I'm using).

I'm writing up the project bit by bit over at http://www.twindx.com/blog/
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