Re: ATM motorizing scope questions

["Bill T." <twentiethwave@hotmail.com>]

Here's a dirt-simple dc servo controller design that gives high precision 
rate and position control over a serial port.  It's based on a PIC 
microprocessor, and is a good match for relatively cheap, small or medium 
size Pittman DC motors with optical encoders.

Controls of this kind are nice because they don't require a transmission 
with an exact mechanical ratio.  They can greatly simplify mechanical 
designs by being able to generate non-linear rate control as required by an 
altaz mount, and things like crude tangent arm actuators.

http://www.microchip.com/download/appnote/pic18/00696a.pdf

Bill T.

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