Thursday, April 24, 2008


Three pin stepper control

When I built the small test board for the 18F4550 I attempted to reduce the number of i/o port pins that were required to drive a stepper using the SN754410 quad half-H driver chip. If you just assign an i/o port pin to each of the equivalent pins on the 754410 you need six; two pins to control the two phases in the tin can stepper and a pair of pins to control the direction of current through each phase.

Tin can steppers don't cope well with half-stepping or full stepping. Wave stepping is about the most they can deal with. That simplifies matters in another way, though.

(Read the whole story)

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