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I know a guy here who sells these systems where you call a number, and it allows the gate to open, if your on the list, or if you key in the secret number. So the "key" doesn't cost anything. Its worth it for a small cellular company to do this.
Sell millions of tiny devices installed in doors, that
get their electricity from the doorknob, and when called by the cellular phone give the status as busy (for locked) or OK (for open).
Or pay for the lowest rate of call to check, and a true answer will be given. Or best: have an SMS sent to you telling you the answer.
People would put this in their front doors and in their car doors, and in the garage doors, and even in pad-locks for gates etc.
This is an implementation of the Lock indicator ideas of Hippo et al.
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//that get their electricity from the doorknob// |
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built with www.microchip.com that uses pico-watts. |
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If not from the doorknob from current from the grid. |
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"//that get their electricity from the doorknob// |
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How?"
First you rub your socked feet across the carpet... |
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Put an RFID transponder in the doorknob that only goes active when the door is locked. |
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Then mount the detector unit on the doorframe, attached to mains power and incorporating a cellular modem. |
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The detector pings the doorknob chip, and reports the status. |
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Easily Bakeable, but not cheap in small quantities. |
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When we all move into the House of the Future, this will be a standard feature. |
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No, it won't. Our Cube doesn't have internal doors. |
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Car remote control fob innards- only sends signal when status changes - encoded - battery lasts several years - local, central receiving unit built in simple mobile telephone with SMS facility and permanent power supply with battery back-up... |
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[+] could be one of the many things a landline can do for you. |
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bigsleep, first you have to steal my cellphone. When I install it, I give it a list of phones that I can call from. And after you stole my phone, you only know if the door is unlocked. |
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