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computer motor controlling

Discussion in 'Electronic Basics' started by Andrew Howard, Sep 22, 2003.

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  1. I want to be able to fully control a motor through the parallel port. I am
    aware how to make it simply turn on and off. The question is:
    What is the easiest method of reversing the voltage to reverse the direction
    of a motor? If anyone can direct me to a circuit diagram, that would be

    Also, what is the easiest method of controlling the speed? Make the parallel
    port pulse? Special circuit somehow. If it is too complex, I could probably
    live with manual control.

    Andrew Howard
  2. You might want to try alt.machines.cnc. Best way a big motor, on my
    Bridgeport and or lathe is by using a relay switch to switch the leads. Also
    depends if it's a 3 phase motor or single phase. My Bridgeport which has a
    single phase has a rotary switch that has to be hooked up into a relay to be
    able to switch directions.

    Russ Wizinsky
  3. Steve

    Steve Guest

    Yup. Pulse width modulation is the answer to your speed control
    question. Changing the duty cycle will alter the speed.

    For direction control, connect the motor (perhaps via an L293D IC) to
    two parallel port outputs, pulse output 1 and keep output 2 low for
    one direction, pulse output 2 and keep output 1 low for the other

    Check out the L293D IC here;

  5. Thanks for the help. I had a brainstorm during my physics exam today;
    thought of relays (dpdt ones specifically). I think it's probably the
    easiest way.

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