CMU camera 2 servos

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I bought a CMU1 camera and have it tracking a coke can with one servo.
I would like to add a second servo for pan and tilt.
I remember seeing a website desribing driving a second servo but I can't remeber where.
Can any one point me to the info for driving two servos ? From the CMU board ? without extra hardware ?
I know I could use the CMU2 camera for this but can't afford the extra cost at the moment.
thanks Steve
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