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I wouldn't use a servo for this. You don't have very fine control over the angle with a servo. Also with a typical telescope the focus is more on rather slow and precise movements, instead of fast ones.
Instead I would use a stepper motor. Depending on your exact requirements, these can be rather cheap to rather expensive.
Here also the mechanics come into ...
1
You work with accelleration and absolute positions. Are you aware of that?
This Library is not made for running permanently in the same direction. It let you define a position where the movement should end, an acceleration or speed and the controller moves the motor to that position.
The run method must be called permanently, It triggers the steps. So, I put ...
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I am interested on this as I have the same issue. What about using a FET or MOSFET to amplify the current that the LM293D provides?
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