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hall effect switch question

Discussion in 'Electronic Basics' started by smpaladin, Oct 3, 2004.

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  1. smpaladin

    smpaladin Guest

  2. CFoley1064

    CFoley1064 Guest

    Subject: hall effect switch question
    It will work for N or S magnets (I think that's what you mean). If you're
    asking about output, it's NPN open collector -- current sink only when on, no
    current source.

    If you can measure magnetic field strength in gauss, you can look at the data
    sheet which is accessible from the link you provided. Otherwise, just get one
    and measure it with your magnet. By looking at the data sheet, you'll see
    there's some difference between max. and min. turn-on and turn-off values. If
    you're looking for extreme positional accuracy, this might not be the part for
    you. But for most small magnets, the turn-on points for these integrated hall
    effect sensor/amplifiers should be within a few mm. of each other.

    Good luck
  3. smpaladin

    smpaladin Guest

    So if it's an NPN open collector, it will be turned on only when a
    magnet is held over the sensor?
  4. CFoley1064

    CFoley1064 Guest

    Subject: Re: hall effect switch question

    Yes. If you use a pullup resistor, the output will go logic low (saturated NPN
    transistor voltage, usually 0.4V to 0.15V, depending on how much current is
    sinking) when the magnet gets close to the sensor.

    Buy one and try it. See how it works.

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