Re: [atm_free] Re: ATM Alt-alt telescope mounts and image rotation - long post

["Mel Bartels" <mbartels@efn.org>]

>>>
If this is correct, can you get Scope.exe to control 3 motors directly (as
in no
Saa1042 field rotation chip)?  Lets say use pins 14-17 to control the third
axis?  My thinking is were going to want micro-stepping in all three axis,
yea?
<<<

As far as my software is concerned, we have several options.  One is to use
the existing field rotator circuitry as is with the halfstepping and
dedicate it solely to the az axis of an AltAltAz so that it only handles
field derotation.  Another is to add code to control pins 14-17 for true
microstepping control.  Another is to move to pulse direction control where
we have lots of data lines available.  Yet another is to move to serial
communications with a smart controller, ala the MacDob project.  This is
what I am doing in the Java servo version - serial communications with the
JDKerr serial servo controller.  JDKerr has a stepper controller that works
similarly.

Mel Bartels