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Hi Fred,
Great project and an excellent build.
Could you please elaborate on:
"The plan to use an ultrasonic proximity detector (Sensortechnik UPR-A 1500 CP TVPA 24 C $80 on ebay, more elsewhere) instead of fancy software to calculate dome rotation."
Will you attach the sensor to the scope? If so, I can see how this would work perfectly for an Alt-Az mount, but GEM mounts can place the scope at odd angles resulting in even stranger dome slot positions for the scope to view through. I'm eager to see how you overcome this.
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