alarm switch

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

Reply to
steve
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See:

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When switch is open, LED illuminates. When switch is closed, LED turns off.

Be sure to choose resistor to match your desired voltage (e.g. for red LED with 5 volts use 330 ohms).

LED indicator could be replaced or supplemented with e.g. a buzzer.

-Mike

Reply to
Mike Wahler

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.

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That is a good term to add to such searches.

That is much more than a "switch".

That isn't a "switch" either.

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You will obviously have to buy these.

The old name in alarms is Alarm Device Manufacturing COmpany

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Go poke around their site and those of other such companies.

You could also easily have used a search engine

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to find out that this is the wrong group for burglar alarms
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Reply to
JeffM

Passive IR sensors are used to detect "movement"

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Piezoelectric vibration sensors are used to detect window breakage:

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Magnetic reed switches are used to detect door and window opening etc.

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A bit of advice - DON'T try and build your own alarm, it's waste of time, but one that is properly designed to be reliable and bug free to prevent false alarms.

Dave.

Reply to
David L. Jones

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.

--
http://webpages.charter.net/jamie_5"
Reply to
Jamie

+OR+securit...

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----------------------------------- Thanks to everyone for their replies.

Please note that I had mentioned the requirement of a personal alarm in my post.

My friend works as a social worker in a bad neighbourhood.

He is frail and therefore requires a personal protection device.

I was wondering if a stun device could be made, by collecting energy in a single electronic part.

Then the energy could be released on the attacker.

Reply to
steve

They are called stun guns. May not be legal.

A cane is legal, learn how to use one of those:

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Also, try typing "personal alarm" into Google, plenty of help and/or panic button devices available.

Dave.

Reply to
David L. Jones

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