How can Arduinos be integrated with the current electronic/control system?

[NerdRage]

Our team has interfaced an Arduino Mega to the RoboRio, through what I believe was the rX/tX pins of the Arduino (not sure, I wasn't in charge of that). We made sure to power the Arduino not through the Rio, but instead through a voltage step-down converter through the power expander. You have to go this route if you want to go LED strips, otherwise I can't think of anything else that would supply the amperage.