Step 12: Done(?)
Watching the "drain" end of the tube is also interesting.... the angle of the wires decreases (with respect to the tube end) near the ends, so there is sort of a (difficult to describe) "trailing" effect as the glowing wires reach the end of the spinning tube. It might also be an optical illusion; I can't tell for sure.
The tube wobbles substantially while spinning up to speed, but then settles down to a tolerable level. I don't think I can eliminate all wobble.
One possible direction for future development would be to add a magnet to the motor and a magnetic pickup to the top support rod, so that I can time the sequencer changes to the rotation of the pipe. Any suggestions?
The sequencer itself could be improved by adding a serial port so that it could be programmed without having to remove the Basic Stamp from the board.....
There are a few quicktime videos attached that give some idea of how this looks.