Well, evidently iTunes on the PC was causing some interference with the COM3 driver that talks to the Arduino. You could verify and download a program, but it wouldn't run right, and it wouldn't communicate back to the serial monitor either. When you tried to download the program a second time, you would get error messages in red that COM3 was not found. To fix it, we just unplugged the iTouch and everything cleared up.
Anyway, we got the nunchucky test program working, getting values for the Joystick X, Y; Accelerometer X, Y; Buttons C and Z, and seems like there is one other set of values, but I can't recall it right now. Also got the train test program working on a giant oval. Now we just have to merge the two software pieces together, and we'll have a Nunchuck-controlled Arduino-run model train.
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