Do you have an oscilloscope to see the stepper optical output signal?
Sometimes an optical sensor output is just an open collector
photo-transistor or photo-diode needing a pull up resistor, Sometimes
they do it just to allow you to hook up the sensor to different voltage
level technologies.  You could check it out using a simple voltmeter at
the opto-switch output and rotating the motor by hand.

The best way to check it out nicely would make the motor run freely and
scope the opto-switch output, include pull up resistors or else, until
you have a pretty clean pulse.

Wagner

Andy Bassam wrote:
>
> I have included a file which will control a stepper motor.  The
> stepper motor that i am using has an opto-switch so when the
> motor reaches a pre defined location it sends a high signal to the
> PIC,  Every aspect of the program works, ie direction, run.  But we
> cannot get the STOPTOP working,  It seems the strpper motor
> output is bouncing so when STOPTOP is reached it does not give
> a clear high, I want to include a number of checks in the CLOCK
> subroutine to stop the motor output from bouncing,