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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.
Not just for breaking glass [csea, Apr 17 2009]
||I'm pretty sure glassbreaks work based on the sound of breaking glass. Just knocking won't do it, I don't think.
||It will, i've tried it. It even works with a loud
noise near the glass.
||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.