BTW...
I noticed you were asking about Stellarium, mentioning your Pillow Block mount.....
This program (Stellarium... as well as many others, Cartes du Ciel for example..) can work with OnStep controller (mentioned in my previous post.
If you are going into trouble with building electronics for your mount, do it properly form the start... because sooner or later you will come to this conclusion yourself anyway
There are other projects that will control your mount properly:
AstroEQ,
Mel Bartels stepper design, PIC-GoTo...
SoundStepper...