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Author Topic: What does this do? (Hall-Effect Current Sensor)  (Read 1384 times)
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No Idea what this does, but I would like to know smiley

Also, if you could explain how to connect and use it that would be great!

http://www.sparkfun.com/products/8882
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It senses the presence of a magnetic field.  Sometimes, they are used with a magnet on the shaft of a  motor to detect RPM without making an electrical connection to the moving parts.

hall Effect
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The Hall effect is always present in conductors, but is only significant enough to make a useful measuring device when current is passing through a semiconductor.  Basically any current in a magnetic field gets "pushed sideways", and the Hall effect is the voltage gradient that develops to balance-out this push in the steady-state.

Hall effect current sensors just place a Hall-effect chip close to a copper strip that carries the current to be measured.  So you have a device that can measure current in a circuit it is insulated from.

Note that these devices will mis-read the current if there is a permanent magnet nearby since they measure the total magnetic field.
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Here's some decent looking links:
http://www.electronics-lab.com/blog/?tag=acs712
http://embedded-lab.com/blog/?p=4469
http://embedded-lab.com/blog/?p=4529

The second link gives a good breakdown of how it works.
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Thank you!
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