Category:Stepper Library

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Stepper Motor Library
When wiring multiple stepper motors to a microcontroller, you quickly run out of output pins, with each motor requiring 4 connections.

By making use of the fact that at any time two of the four motor coils are the inverse of the other two, the number of control connections can be reduced from 4 to 2.

A slightly modified circuit around a Darlington transistor array or an L293 H-bridge connects to only 2 microcontroler pins, inverts the signals received, and delivers the 4 (2 plus 2 inverted ones) output signals required for driving a stepper motor.


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