Anyone have experience with magnetometers & interference?

[Joseph Pizzo]

Hello, I was wondering if anyone with experience working with magnetometers could recommend something less susceptible to interference than this:

http://www.sparkfun.com/products/10619

I want to track object location over a wire grid and thought that this magnetometer would be a great place to start… but my apt. is heavily saturated with interference like wifi, microwave, and cell phones. I'd like to do this inexpensively if possible… also if you've done this before I'd like to know how your project turned out. Would aluminum shielding help?

thank you.

[c f]

Are you attempting to run current through the wire grid somehow and detect your position relative to the known magnetic field?

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[Joseph Pizzo]

yes, essentially.

[raphael]

Hey everyone!

I need some soldering help on a job I'm doing. There's money in it! The
job is to build a set of 30 custom touch sensors that are going into a
store display at Bloomingdale's.

I'll need a hand tomorrow from 10AM until 7PM. Come any time within that
period.

I'm pretty sure everyone has my phone number by now, but just in case
you get locked out: 917 402 9737.

Thanks!
-Raphael

[astrida]

Will be by between 10-11am!

[raphael]

Yay! Boo! Yay!

I'll post some when we install on the 15th. Stay tuned...

Thanks for responding!
-r

On 04/02/2012 02:19 PM, Susan Tan wrote:
> Sounds like a cool project! But I'm too far away from NYC to help out.
>
> Do you have pictures or videos of the touch sensors?

> case you get locked out: 917 402 9737 <tel:917%20402%209737>.
>
> Thanks!
> -Raphael

>
>
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> Susan Tan
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[Susan Tan]

Sounds like a cool project! But I'm too far away from NYC to help out. 

Do you have pictures or videos of the touch sensors? 

-Raphael

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[c f]

Does the 'grid' somehow generate a map of unique magnetic fields across your detection zone? It's not immediately obvious to me how you would do that (unless you're doing some kind of charlie-plexing style setup, where you turn on the grid-lines in sequence and then figure out position from there).

 

The immediate answer that comes to mind is, more current = stronger magnetic field. Magnetometers aren't particularly fast, I believe, so you may only be able to get a couple of Hz. It should be pretty easy to overpower local 'noise' if you're running a couple of amps through your grid, and your sensor is relatively close.