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Glass alarm as doorbell

 A highly tedious idea
  (+7, -1)
(+7, -1) 		  [vote for,
against]

I'm mainly just sticking this here in case anyone else would benefit from it. I wouldn't regard it as in any way interesting.
Use the anti-burglary devices which set off an alarm when the windows on which they are stuck vibrate strongly as "doorbells". Stick them to glass on a front door so that when someone knocks, it sets off an alarm.

Boring but practical.

—nineteenthly, Apr 17 2009

Glass Alarm http://www.allprodu.../kwd/23-ld-26b.html
Not just for breaking glass [csea, Apr 17 2009]

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       I'm pretty sure glassbreaks work based on the sound of breaking glass. Just knocking won't do it, I don't think.
—phoenix, Apr 17 2009
   

       It will, i've tried it. It even works with a loud noise near the glass.
—nineteenthly, Apr 17 2009
   

       Oh, it works, alright! Those damn alarms are always going off in the mall parking garage, set off by the slightest sound. The seem particularly susceptible to the low-frequency bass vibrations that chavs like to pump out of their vehicles. In my neighborhood, the doorbell would never stop ringing. I guess it's a good idea for a quiet neighborhood, though. [+]
—21 Quest, Apr 17 2009
   

       The one i've used turns itself off after a few seconds. I was wondering about the traffic noise, but it's been OK so far.
—nineteenthly, Apr 18 2009
   


 

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