The easy way is to use a stepper motor - then you can synchronise the text just using the code. Plus you could make it sweep back and forth just like the displays you can buy at Maplins.
Using a feedback loop would work, but it'd take a lot more effort.

Lordy - I haven't done any of this stuff for years, but you're stirring up my interest again!
( P-MONKE We're all fucked, Sun 20 Nov 2011, 18:07, 1 reply)

Yes. Stepper motors.
The only thing with that is, that I only have 8 digital on/offs and 8 analogue outs/ins, with no real way to control the step.
I have some hall effect sensors on order (about 1 quid for 10 on ebay). When they arrive, I'll place a magnet at the top and only trigger the next sequence in the byte array when the magnet is detected. That will at least stabalise where the text is.
(dchurch bah, Sun 20 Nov 2011, 18:11, closed)

Sounds like you're on top of it! :)
( P-MONKE We're all fucked, Sun 20 Nov 2011, 18:19, closed)