You can salvage some nice motors out of optical drives but they can be tricky to control ... Arduino and has a couple of posts explaining the concept and demonstrating how it works. His test ...

Mechaduino is a board that sits on a regular stepper motor and turns it into a servo with a closed loop control of 0.1degree ... they’ve promised. he Arduino-sounding bit of the name comes ...

Dr. Tom Tilley has brought the mechanism from Bust-A-Move to life using cardboard, a servo, and help from an Arduino.