> Or you could have the panel in four sections and use differential=20
> voltages to find "brightest" part of sky

Yes, I've looked here and at sites like it for ideas

http://www.redrok.com/electron.htm

So far the vast majority I've seen are simply LED or CdS trackers

I can see why some people prefer to keep it simple. Adding calculated
tracking might not be strictly necessary (in favourable conditions) but it
would be a good enhancement for getting the best performance overall

> Is a weak spring and escapement the best way to "rotate back" to
> start before dawn or use the motor?

Personally I think I'd use the motor to return for the next dawn
--=20
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