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Cell Phones - how can a phone call trigger a system?

Hi
I'd like to use a cell phone to trigger the start of an electrical event in my system.

Is there a circuit board type component for phone calls, or must I connect a pay per call inexpensive  phone from Best Buy?
Can the ring tone generate an electric signal / sound in the 1/8 inch sound port, to initiate the other elements? When cells are rung, do they automatically send signal to the sound output?

Thanks
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beavoid
Asked:
beavoid
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1 Solution
 
Giovanni HewardCommented:
Your not using nichrome or cast epoxy initiators, right?  ;)

You can use a circuit to trigger a relay.  A ring detection circuit could be used to avoid phone charges, or a photoelectric diode to monitor light changes on the display (no modification to the phone is required.)

Here's some examples
http://www.youtube.com/watch?v=7ZyUMfl41G8
http://www.youtube.com/watch?v=oTH2mSUPmfo

Here's a $38 version @ http://www.ebay.com/itm/141144835406
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beavoidAuthor Commented:
Thanks

I think I might simplify my overall needs by creating a proximity detection system. Can an app detect when one has walked 10 ft away from a home point, and maybe run a neural net to analyze x,y land-based position changes? Can an app run as a Thread in the background, without having to open it up?  to do this?

Is this a different question? The above answer was v.good!
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Giovanni HewardCommented:
It's a different question, but take a look here and here.
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beavoidAuthor Commented:
perfect!
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beavoidAuthor Commented:
Thanks x72
Those links were very helpful.
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