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October 14, 2009
about 2 years ago
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 :
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
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