Quote:
Originally Posted by rcheshire
Interestingly, the mount has potentiometers to adjust for other tracking rates - trial and error.
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Other option is to add a digitally switched resistor ladder to the pot to get the desired 0.5x change in speed for auto guiding in RA
So you use the centre tap and an opto coupler to add a fixed resistor in series or parallel to get the two speeds
A picaxe or arduino can monitor the 4 st4 outputs and control the ladder. It's very simple and would only need a handful of components. No change to your mount controllers other than the pot tap. Only requirement is that the pot provides a sufficient change in tracking rate