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Help with control by wire - circuit needed

Discussion in 'Electronic Basics' started by TrailRat, Aug 6, 2004.

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  1. TrailRat

    TrailRat Guest

    I am after a PWM circuit that can be used to help me build a two
    wheeled carry cart. I will want to be able to control the the speed of
    two motors so I can intiate turns. Skid steer is the term I think.
    Forward and reverse also required. Control of cart will be done from a
    handheld unit connected by umbilical. Unsure as to put circuits with
    the switches in the handheld or in the cart with the batteries and
    motors. Any advice or help would be useful. Please don't suggest
    looking for help in the library or search engines as their seem to be
    so many variations of the PWM circuits and I have no idea which would
    suit my task.

    Many Thank

    Gadget
     
  2. Chris S.

    Chris S. Guest

    Any of those circuits you found would most likely fit your task. It's
    really the circuit that is fed the PWM signal that is dependent on your
    application. Depending on the size of your motors, you'll need to
    amplify the power of the PWM signal to drive the motors, such as with an
    H-bridge.

    However, another aspect of the overall controller to consider is
    complexity. You can make a PWM circuit using something as simple as some
    555 timers, or as complicated as a microcontroller. Personally, I find
    the microcontroller route far simpler in the end, as it allows you to
    easily incorporate "intelligent" features into your design by simply
    reprogramming the controller. I prefer Atmel's AVR micros and the SP12
    in-circuit programmer.
     
  3. John Jardine

    John Jardine Guest

    Most of the simple PWM circuits you come across will be OK. Even something
    like a 555 feeding a TIP Darlington is quite capable of running a big
    golf-cart motor, so a couple of these types of PWM could do the job.
    Electronic reversing would need an H bridge. Much easier though with relays.
    regards
    john
     
  4. hamilton

    hamilton Guest

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