> On Olin's page there is a cool spinning row of LEDs that show text.
> In this application, how does the PIC know the exact position of the
> motor/row of led's?

There are various "propellor clock" projects on the web which give
information on this style of display.

This one is by a list member
http://www.bobblick.com/techref/projects/propclock/propclock.html

and there are others you can find with google.

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