Many PC users use their computer to control
electromechanical systems. In these applications, it is often
required to switch and control stepper motors. The circuit
presented here communicates with the PC via the serial
(RS232) interface, and is capable of driving two stepper
motors. One of these does half steps only, the other, half or full
steps. The control board is a truly multi-purpose design which
is suitable for a wide variety of electromechanical applications
based on stepper motors.
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