Re: alarm switch

steve wrote:
From seeing various alarm projects,
there is no detail about how the alarm is set off.

This is something that a search engine could easily find for you.
This link points to a site
that has all kinds of answers about this sort of thing.
http://www.google.com/search?q=burglar-alarm+howstuffworks
That is a good term to add to such searches.

There should be a special kind of switch that will sense motion,

That is much more than a "switch".

or breakage of a (window) latch, etc.

That isn't a "switch" either.
http://www.google.com/images?q=window-bug+alarm+OR+security
http://www.google.com/images?q=Traditional-lead-tape+alarm+OR+security+-golf
You will obviously have to buy these.

The old name in alarms is Alarm Device Manufacturing COmpany
http://www.google.com/search?q=ADEMCO
Go poke around their site and those of other such companies.

You could also easily have used a search engine
http://groups.google.com/groups/search?q=burglar-alarms+-uk
to find out that this is the wrong group for burglar alarms
http://groups.google.com/group/alt.security.alarms
.

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