I've received my first Arduinos and am in the process of wiring them up - exciting.
I've drawn up a circuit diagram in the hope that someone 'in the know' might check it over before I start assembling it. My main point of concern is the power side. The +5v feed to the Xbee explorer regulated is from an RC BEC and the power to the arduinos is direct from a 11.1v Lipo. The only reason I haven't put these on the BEC is to minimise the damage if the BEC went wonky. Also, should I add decoupling caps between power and GND? If so, can you recommend a value?
Mega2560: http://www.sparkfun.com/products/9949 Pro: http://www.sparkfun.com/products/9221 9DOF sensors: http://www.sparkfun.com/products/10321 Explorer regulated: http://www.sparkfun.com/products/9132 Logic level conv: http://www.sparkfun.com/products/8745