BTW, check the latest QST for another piece of the puzzle.  This guy gets the azimuth reading from the single-chip magnetometer.  Someday I thought it would be fun to use a magnetometer and an accelerometer (to measure the acceleration due to gravity) to get both Az and El without pots.

On Tue, Feb 8, 2022 at 2:31 PM Martin Cooper via AMSAT-BB <amsat-bb@amsat.org> wrote:
Hi Joe,

Ha ha! You're right there. I think my total came to about $50, including a case, which was the most expensive item. A lot more than the digital pot solution, but not too bad for a complete rotator controller.

Martin.
KD6YAM

On Tue, Feb 8, 2022 at 10:23 AM Joseph B. Fitzgerald <jfitzgerald@alum.wpi.edu> wrote:

Martin,

Yes a SAEBRTrack type approach is more general purpose than the AA2TX digital pot solution, it can be used with pretty much any pair of rotors.    Tony was never really happy unless you could fill your entire bill of materials for less than $5 - and 4 relays plus the microcontroller and drive electronics blows that budget!

I checked eBay, and apparently missed my opportunity in December for two new old stock Orbit 360's.  I did find an RCA rotor only deal that I could not pass up though ... it arrives this weekend!   

de KM1P Joe

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