On Wed, 13 Mar 2019 at 23:45, Gene Heskett <ghesk...@shentel.net> wrote:

> > When I have considered doing it I have thought in terms of a
> > semi-circular track and an opto-sensor. (so it never takes more than
> > 180 degrees to home)
>
> In other words, a grey scale with enough opto's it knows where it is w/o
> moving at all.

No, a single sensor and a 180 degree target.

-- 
atp
"A motorcycle is a bicycle with a pandemonium attachment and is
designed for the especial use of mechanical geniuses, daredevils and
lunatics."
— George Fitch, Atlanta Constitution Newspaper, 1916


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