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There are two steppings for a stepper
motor
1. half stepping
2. full stepping
An animation of half stepping is in the following link
http://www.eio.com/step-hrot.html
Half and full stepping table is available in the following link
http://www.doc.ic.ac.uk/~ih/doc/stepper/control2/sequence.html
http://www.imagesco.com/articles/picstepper/05.html
http://www.cctc.demon.co.uk/stepper.htm
I will explain how to drive a stepper motor in H-bridge section. More
stepper motor links
http://www.imagesco.com/articles/picstepper/02.html
http://www.cs.uiowa.edu/~jones/step/types.html
http://www.doc.ic.ac.uk/~ih/doc/stepper/
http://wolfstone.halloweenhost.com/TechBase/stpint_StepperMotorIntro.html
http://www.epanorama.net/circuits/diskstepper.html
http://www.doc.ic.ac.uk/~ih/doc/stepper/control2/connect.html
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