[EricH]

Ah, the "what are the rules?" question.

Well, to be honest, we don't know the rules for 2012 yet. However, you may find Section 4.3.10 of the 2011 Game Manual interesting reading.

Now, that won't affect what can be attached to an Arduino for non-competition purposes. But if you're using it for FRC purposes, those rules governed what you could do in 2011 and may or may not be similar to the 2012 rules.