For those of you with access to the book and/or a better understanding of the Uno, I have a question - Figure 10-1 shows a wire running from what appears to be a numeral 9 near the 5V and GND wires at the bottom left corner of the figure. This wire goes into the positive power column/row at the top of the breadboard which then connects to the stepper motor.
On my Uno, this is labeled Vin (I think) - the author says to use external DC power for this project so I'm wondering if that's how power is being applied to the motor. It's just never been mentioned in the previous projects so I'm a bit confused.
Also... a bit of checking online reveals that the Uno wants a 9V AC-to-DC power supply adapter which I don't have... but I do have a variable one that can be set to 9V. The only problem is I cut off the end to expose the wires for the Make: Electronics book (so it can be plugged directly into the V and GND breadboard rows). I'm thinking I should be able to just plug in the Arduino to the USB for its own power needs and, while still running the 5V and GND wires from the Arduino to the breadboard for the chip's power needs (5v or less I'm guessing) I can just skip the "9" or whatever that is and provide power to the motor with my variable adapter's leads... right?
Update: And wouldn't you know I'd buy the one stepper motor that doesn't seem to have any kind of help in terms of data sheet when it comes to sorting out the six wires and what goes where! Argh...