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Topic: What does this do? (Hall-Effect Current Sensor) (Read 1 time) previous topic - next topic

CTE_T

No Idea what this does, but I would like to know :)

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

http://www.sparkfun.com/products/8882

DVDdoug

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

MarkT

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.
[ I won't respond to messages, use the forum please ]

jfenwick

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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