Microstepper controller

I have been thinking for a while, how to put togeter a simple microstepper controller without using a ready made commercial driver.
At the end, I came up with this simple project capable to drive unipolar stepper motor in three different modes

FULL STEP

HALF STEP

MICRO STEP

The Pic micro used in this work is a Pic 16F628 a powerfull small micro with PWM capability. With this MCU plus a 74HC04 and a74HC86 the controller will produce 20 microsteps out of a nominal motor step.

An additional improvement of this controller, is the capability to accept travel commands of 24 Bits, wich gives to the user the possibility to send positioning profile of over 16 millions steps.

Controller accept commands via TTL serial port @ 9600,n,8,1 and return an (Ack) once the positioning profile has been completed.

Download the zipped MicroStepper.zip file which contains schematic + software + user manual

Also attached is a simple stepper controller example called Stepper_MK2.zip

Enjoy

Al.