Re: alarm switch
- From: "Mike Wahler" <mkwahler@xxxxxxxxxxxx>
- Date: Sun, 11 May 2008 08:38:50 -0700
"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.
Could anyone please explain.
See:
http://www.mkwahler.net/alarm.GIF
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
.
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- alarm switch
- From: steve
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