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Sol'n to Speed Feedback?

I finally found a website that explained how to use Hall Sensors to detect
speed (Hall sensors cost less than $3 each).  If you guys care, you may
check out how they work at this website: www.kemparts.com/tt10/tt10.html

Hall sensors are used in car engines to determine how fast the car is
moving.  I think we should be able to use them on our robot.

Joyce :)