So at first I couldn't get anything to work. Then I realized Arduino did not "save" my USB port from the last time I programmed it. After setting the port, I was able to upload a sketch.
The "knob" one did not work, so I decided to try the simpler "sweep" example--and it worked!
My little servo was spinning!
I turned it off, then swapped the horn from the circular pattern to the vertical so I could see its direction easier.
Then I changed the sketch to set the horn position to 90, put the horn on straight up and down, and screwed it down. When I turned it back on, it was moving in a nice 180 degrees.
Next I tried the knob example again. Still nothing.
The only POT at Radio Shack was a 10k w/ a SPDT switch. I wasn't sure I had +5V and GND hooked up on the POT right, so I powered everything off, switched them, then powered it back up...
Now nothing works.
I reloaded the "sweep" program, and took off the POT wiring, and even wired my servo directly into the Arduino; just pin 9, +5V, and GND.
Did I break my servo already? 