Earlier tonight, in the class that I’m co-teaching, we were working with one of the students on a project where the goal is to make a dinosaur, constructed from wire, walk. We also needed to be ableto control this with an OOPic. The easiest way to approach this was to use a servo that is modified so that it can continuosly rotate, rather than stopping when it gets to the end of the internal potentiometer.

• http://www.kronosrobotics.com/an116/GAN116_hs300.shtml
• http://www.robotstore.com/download/Servo_Mod_Notes_1.0.pdf
• http://www.uoguelph.ca/~antoon/gadgets/servos/servomod.html

Also, if you are looking to buy servos, be sure to check out http://servocity.com/ . This is where we’ve been buying our servos in the class. They have some decent prices too.