Bug Fixed

["Thomas Droege" <tdroege2@earthlink.net>]

I have fixed a long term bug.  The problem is that the carriage would
sometimes move a little in declination at an unexpected time.  This would
make stars little vertical streaks.  A real pain since the software still
finds stars and no telling what this does to the data.

It turns out that I was turning the motors off at a particular point in the
code.  Those writing their own code should never turn the dec drive motor
off while trying to hold a position.  It mostly holds if the power is off,
but it has no torque and so anything can move it.  A little pressure from
the mount cables, wind, etc..  

This is now fixed and I hope to never see the vertical streaks again. 

 I found this by hanging a weight on a string so that it put a torque on
the declination axis.  I thought the problem was backlash.  This would
remove it.  What I observed was that the mount took a big step after the
first move.  I finally found where I was turning the motors off.  I little
bit of mystery code marked "this makes it work but I don't know why".  I
just removed the part of the ;mystery code that reset the motor drive
current.  

My code really needs to be rewritten from scratch.  I keep hoping that
someone else will give me nice code that does everything.  So I don't have
to do it.  OK, it will come some day, but I am not yet ready for it anyway.
But some day.  Eventually someone will run their telescope enough to
thoroughly debug the code.  

Tom Droege