Re: alarm switch

steve wrote:

I require alarm systems for both personal and house.

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

For example, a house alarm could be triggered by opening a door.

But the diy circuit notes merely say that power supply will trigger
the alarm on.

There should be a special kind of switch that will sense motion, or
breakage of a (window) latch, etc.

Could anyone please explain.


Yours sincerely


Steve
I assume you're talking about a car alarm ?

Most of those do power supply sensing among other things.

What this means is, if some one opens the door which would prompt
some electrical device in the car to activate like the doom light, the
alarm unit will detect a power flicker from the lights coming on.

That is just one example.


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