Paul__B:
I bought a Raspberry Pi because it uses less than 7 watts. Possibly half that.My intention was to commit it as a web server. Well, to be honest, I haven't yet, but ...
@Paul__B,
How are you planning to interface the RPi to the Arduino? I've seen a couple examples of how it can be done, but I've had trouble implementing it myself.
I've looked at LowPowerLab's Raspberry Pi tutorial. Felix uses serial(uart) to communicate between the Pi and the Arduino. He even shows you how to set up a SSL encrypted authentication scheme. Very nice. The tutorial even uses websockets, but all the node.js is beyond me right now. Haven't had time to figure it out.