using the standard firmware (which uses the four aux inputs as analog) you can connect an analog accelerometer directly, no reprogramming required.
i used one from http://sparkfun.com for about $35 i think?
this: http://www.sparkfun.com/commerce/product_info.php?products_id=844it has a nice breakout board, so the soldering is easy, and the passives are all included.
not much to it: solder gnd to gnd, 5v to 5v, AY and AX to two analog-in pads on the logic board.
that’s it. mechanically mount it with some sort of screw.
alternative mounting
this seems to work much better
the black block is nonconductive foam to help stabilize. also the accel pcb is trimmed to fit better into the enclosure.
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