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  1. #1
    150+ Forum Groupie Atomic_Sheep's Avatar
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    Unlimited Potentiometer

    Hi Guys,

    Just wondering what an unlimited potentiometer is called i.e. a potentiometer that doesn't have a max and a min level i.e. one that you can rotate freely for as long as you want in any direction.

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    Re: Unlimited Potentiometer

    Maybe you mean unlimited rotory encoders?

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    Re: Unlimited Potentiometer

    If you are really looking for a potentiometer (and not an encoder), then look for "endless potentiometer" like this one here:

    http://www.piher.net/sensors/index.p...art&Itemid=31#

    In most cases these are standard pots with just the stop removed. With some types of pots you can remove the stops yourself.

    What would you try to achieve with that ?

    And then there are multi-rotation pots, with ten or more turns. But they eventualy have a stop.

    Gerald

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    Re: Unlimited Potentiometer

    Do note that even most of the fancy-schmancy potentiometers have an ELECTRICAL limit (that one says 340*, for instance), even though it may be capable of infinite turns. This means you can't reliably track the pot position through a complete turn.

    It's possible to construct a "combo" pot with onboard electronics that figures up shaft position from multiple carbon tracks, but I recommend a Hall encoder:

    http://www.madscientisthut.com/Shopp...0Encoder&xm=on

    I've used the AS5040 for an altimeter project, I attached it and a magnet to the back of a synchro. It worked FLAWLESSLY and is very precise.

    Matt