DC Motor Driver Circuit ULN2003 Experiment-Correction L293D

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  • When you need to be able to reverse the DC motor then the complexity of a H-bridge is needed. When all you need to do is control the motor or even PWM it then there's this wonderful 3-pin IC called a "MOSFET". Yeah, and what's more, they are usually rated to handle many 10's of amps so that motor stall should never be a problem. You can even drive them from 3.3V with only a single I/O.

    Ok, sounds over the top maybe? But it's true and it is exactly what I would use. Why use a space pen when a pencil will do?

    Tachyon Forth - compact, fast, forthwright and interactive
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  • Thank you all

    Here is the article.

    https://electrosome.com/dc-motor-l293d-pic-microcontroller/

    You just replace that micro with a Stamp (BS1 to BS2p40) or Propeller.

    The article is the level of this forum.

    So. That is how to connect Parallax micro to DC motor.

    There may still be a Parallax article or Nuts and Volts or Application Note out there somewhere like it.

    Happy holiday! 14 days til Christmas!
  • So you are not really interested in finding out how to do it then?

    How hard is it to connect the 2 wires of a DC motor?

    I've not seen you follow through on any of your "problems".

    Maybe you just like creating a stir?

    I could be wrong but moderators please take note.

    Happy holiday!

    Tachyon Forth - compact, fast, forthwright and interactive
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  • microcontrollerusermicrocontrolleruser Posts: 1,194
    edited 2018-12-10 - 04:34:41
    "When you need to be able to reverse the DC motor then the complexity of a H-bridge is needed"

    Thank you for that.

    Will connect up some of this stuff.

    Using a 4.5 volt 3 AA battery box to power motor.

    It's a motor on a Tamiya wheel ratio kit. Turns some different diameter wheels with rubber bands for belts.

    No 'belts' on it.

    Happy holidays!
  • For those of you wandering through this thread looking for suggestions and examples of DC motor control using a Basic Stamp or Propeller, do have a look at the Nuts and Volts columns, particularly Vol 1, #23. This is a long-running series of columns in Nuts and Volts magazine most by JonnyMac on a variety of topics, complete with easy to understand discussions and explanations and practical examples.
  • microcontrolleruser,

    I thought you wanted to know how to connect 2 motors to an L293D and I have seen much better tutorials than the one you linked to.
    https://itp.nyu.edu/physcomp/labs/motors-and-transistors/dc-motor-control-using-an-h-bridge/


    Mike,
    That's a good article and it even has something for Erco (controlling 2 motors with relays through a ULN2003).

  • Thank you Mike

    There we go a Nuts and Volts article on it. Suspected there was one out there.

    Probably an application note too.

    Thank you Genetix

    "I thought you wanted to know how to connect 2 motors to an L293D"

    Not me. That would be like saying I wanted to hook up four because I looked at ULN2003 first.

    Nope. Just one motor.

    I do not think there is an IC for just one motor.

    The L293D just throws in a circuit for extra motor. That was a common sense thing to do.

    Happy holidays!

  • Here is the L293D in a nutshell.
    Control Signals and Motor Status
    RB0/IN1 RB2/IN2 Motor Status
    LOW LOW Stops
    LOW HIGH Anti-Clockwise
    HIGH LOW Clockwise
    HIGH HIGH Stops
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