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Member #86057

Member Since: October 14, 2009

Country: United States

  • Hey guys, I got one of these sensors and am trying to build a tachometer (motor speed meter) using this device.

    So when i connect my hall sensor (5v,gnd, 10k pullup at the output), if i move a small magnet close to it (½ inch) it indeed switches the signal as expected, (i check the signal level on an oscilloscope)

    But if i put my hall sensor next to a small dc motor (parallel to the shaft) (such as this: http://www.solarbotics.com/product/tpm2/ , or even this : http://www.robotmarketplace.com/products/0-PL1596.html)

    I expect to see more or less a square wave pattern on the oscilloscope, but i dont. My motor spins like crazy (~10,000 rpm) but no effect on the hall sensor. Any ideas ?

    thanks in advance A.

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