mattallen37:
I'm curious though, how are you getting the 9v supply from the NXT? Did you wire directly into the battery compartment?
you have to use the white wire from the nxt port. However in the nxc code you also have to configure the port for sending 9v power i.e. just use setsensorlowspeed command like you would for the ultrasonic. The arduino will only come on when you run the program though.
And thanks for your replies.