Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
It's as much a hovercraft as a pancake is a waffle.

idea: add, search, annotate, link, view, overview, recent, by name, random

meta: news, help, about, links, report a problem

account: browse anonymously, or get an account and write.

user:
pass:
register,


         

Please log in.
Before you can vote, you need to register. Please log in or create an account.

Glass alarm as doorbell

A highly tedious idea
  (+6, -1)
(+6, -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]

[link]






       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
  

       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
  
      
[annotate]
  


 

back: main index

business  computer  culture  fashion  food  halfbakery  home  other  product  public  science  sport  vehicle