gearwheel encodjng

[FJB203 at aol.com]

In a message dated 97-02-04 22:45:06 EST, you write:

> Ah one important thing to mention, is that these units are sealed quite
>  well so dirt, grease etc should not present a big problem.

They are sealed, however road crud can get between the IR transmitter and the
IR receiver, thus blocking view.  Magnetics is probably the best way to go,
and the circuitry to drive it would be similar...

Fred