control dc motor speed using using visual basic

Discussion in 'Programmer's Corner' started by mdnght, Mar 11, 2009.

  1. mdnght

    Thread Starter New Member

    Nov 5, 2006
    hi i need help to create a vb code to control dc motor speed
    i already created the code to supply pwm signal to the motor driver but users need to give an input in duty cycle in vb's GUI

    but actually i am required to create a code so that users can give an input in rpm

    hope someone can help me

    the pwm signal is sent to the motor driver via 1 port in parallel port
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    Sounds slick. How do you do the low level control out of the printer port? I thought VB didn't let you get to hardware. How is the port configured - SPP or EPP?

    We can't help with the change from duty cycle, as we have no idea about the motor. I think if you measure the motor speed with each increment of duty cycle, you can make up a table to look up duty cycle from a desired RPM input.

    That should not take you 10 minutes, once you have the motor speed measured.