controlling stepper motor direct to parallel port
Hello skalaxy,
Ok, now I see why you have connected pin 19 to Vcc, you are not using that half of the chip, sorry that I missed that point, you are correct. I am not very familiar with LabView but what you say makes sense as my colleague recently had a similar problen with it. The only thing I can suggest is that you generate your motor run clock with for example a 555 timer and gate it on/off with a LabView output like you use for the direction control pin, that way you could generate a clock that is faster than 1khz.
Are you sure that your motor can use pulses at 1kHz, a lot of stepper motors can not because the winding inductance is too high, if this is so you would get the effecct that you have found, the motor shaft vibrates but will not turn.
Best regards,
Bob.