From: "Bill T." 
To: atm{at}shore.net
Reply-To: "Bill T." 


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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