I just came back from DroidCon 2012 by hasgeek, where I gave a talk about using WebSockets with Android to control Arduino based robots. I talked about WebSockets, how it can be used with Android and then gave a demo that I made using WebSockets, Android and the node.js server which I wrote for jsFoo. The demo allowed anyone from the audience to control an Arduino based robot which I placed in the stage.
I didn’t just talk about making Android and Arduino talk to each other, since I have already covered that in last year’s DroidCon.