Changes
* http://www.arduino.cc/playground/uploads/Learning/relays.pdf
=== I/O Usage ===
14 digital I/O pins (6 PWM) and 6 analog
* D12: SD_OUT
* D13: Currently LED (SD_CLK)
== Components ==
* ULN2803A [http://www.ti.com/lit/ds/symlink/uln2803a.pdf Datasheet]
