Re: alarm switch
"steve" <kvsteve@xxxxxxxxx> wrote in message
news:a2c5fbe6-6beb-40f3-a0e1-3e1656e5e955@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
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.
Passive IR sensors are used to detect "movement"
http://en.wikipedia.org/wiki/Passive_infrared_sensor
Piezoelectric vibration sensors are used to detect window breakage:
http://en.wikipedia.org/wiki/Piezoelectric_sensor
Magnetic reed switches are used to detect door and window opening etc.
http://en.wikipedia.org/wiki/Reed_switch
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.
.
Relevant Pages
- Re: Installing alarm system on a prewired house
... We pre-wired a house for a wealthy doctor and his family during ... "My alarm is 'broken'. ... determined that one of the living room windows was open and told ... that the problem appeared to be a living room window. ...
(alt.security.alarms) - Re: Your Favorite Install Tool?
... The worst I think I have every seen was a wood frame house in Milwaukee in which the installer ran all the wires to the windows on the 'outside' of the house, around the house, stappled to the siding, under the roof overhanges and then each run down to the windows. ... He drilled directly into and through the window frames to his alarm window sensors. ... All the brown zip cord wrapped around the house and back into the wall into, you guessed it, a home made alarm bell in a box control. ...
(alt.security.alarms) - Re: Your Favorite Install Tool?
... The worst I think I have every seen was a wood frame house in Milwaukee in which the installer ran all the wires to the windows on the 'outside' of the house, around the house, stappled to the siding, under the roof overhanges and then each run down to the windows. ... He drilled directly into and through the window frames to his alarm window sensors. ... All the brown zip cord wrapped around the house and back into the wall into, you guessed it, a home made alarm bell in a box control. ...
(alt.security.alarms) - Re: How would you defend yourself?
... | grey_ghost471-newsgroups@xxxxxxxxx (Gray Ghost) wrote: ... |>> A good alarm system with video works pretty well. ... alerts to something in the house and I pick up my shotgun. ... Woof, woof woof... ...
(talk.politics.guns) - Re: How would you defend yourself?
... | grey_ghost471-newsgroups@xxxxxxxxx (Gray Ghost) wrote: ... |>> A good alarm system with video works pretty well. ... alerts to something in the house and I pick up my shotgun. ... Woof, woof woof... ...
(talk.politics.guns) |
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