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Hall effect sensors: how close can two magnets be without interfering? Answered

Suppose I have several magnets and I want to use the same number of Hall effect sensors to read their polarity. Each sensor would be within 1-2 mm of its intended magnet. How far apart would the magnets need to be to avoid interference? I'm looking specifically at the Melexis US5881.

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steveastrouk

3 years ago

The positional sensitivity can be very high, if you make polepieces to carry the field to the hall sensors.

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ThomasB164Josehf Murchison

Answer 3 years ago

US5881LUA, actually. What information am I looking for on the datasheet? I looked it over before I asked and didn't find anything that I understood as an answer, but I do not have experience with these things. Thanks for your help!

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Josehf MurchisonThomasB164

Answer 3 years ago

Ah the automotive package needs a strong south pole to switch and ignors north pole.

That is in the data sheet 10 to 35 mT and one mT is 10 gauss.

Got to go.