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

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Last Modified: 2013-12-29
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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James HancockSelf Employed

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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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It's a different question, but take a look here and here.
James HancockSelf Employed

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Commented:
perfect!
James HancockSelf Employed

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Commented:
Thanks x72
Those links were very helpful.

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