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From: brent on 30 May 2010 09:25
I am looking for a light sensor like is used in a garage door system
to detect if an object is between a light source and light sensor.

I need something to put in my back yard to detect if someone is
breaking through a particular path. It is like a light activated trip
sensor , used for home security awareness, but I cannot figure out
what this device is called so I can find it online to purchase.

Any ideas?

Thanks


Background: Just had some people crawl through my back window a couple
of weeks ago and steal some stuff with house full of people, nobody
heard them. I want more situational awareness. I also have other
more effective means now of dealing will them too.
From: lektric.dan on 30 May 2010 10:19
On May 30, 8:25 am, brent <buleg...(a)columbus.rr.com> wrote:
> I am looking for a light sensor like is used in a garage door system
> to detect if an object is between a light source and light sensor.
>
> I need something to put in my back yard to detect if someone is
> breaking through a particular path.  It is like a light activated trip
> sensor , used for home security awareness, but I cannot figure out
> what this device is called so I can find it online to purchase.
>
> Any ideas?
>
Check these out. They require a reflector on the other side of the
path to work.
http://www.bgmicro.com/SWT1156.aspx
From: krw on 30 May 2010 11:15
On Sun, 30 May 2010 06:25:27 -0700 (PDT), brent <bulegoge(a)columbus.rr.com>
wrote:

>I am looking for a light sensor like is used in a garage door system
>to detect if an object is between a light source and light sensor.
>
>I need something to put in my back yard to detect if someone is
>breaking through a particular path. It is like a light activated trip
>sensor , used for home security awareness, but I cannot figure out
>what this device is called so I can find it online to purchase.
>
>Any ideas?

Floodlight/motion detector.

>Thanks
>
>Background: Just had some people crawl through my back window a couple
>of weeks ago and steal some stuff with house full of people, nobody
>heard them. I want more situational awareness. I also have other
>more effective means now of dealing will them too.

Rottweiler.
From: John Larkin on 30 May 2010 11:39
On Sun, 30 May 2010 06:25:27 -0700 (PDT), brent
<bulegoge(a)columbus.rr.com> wrote:

>I am looking for a light sensor like is used in a garage door system
>to detect if an object is between a light source and light sensor.
>
>I need something to put in my back yard to detect if someone is
>breaking through a particular path. It is like a light activated trip
>sensor , used for home security awareness, but I cannot figure out
>what this device is called so I can find it online to purchase.
>
>Any ideas?
>
>Thanks
>
>
>Background: Just had some people crawl through my back window a couple
>of weeks ago and steal some stuff with house full of people, nobody
>heard them. I want more situational awareness. I also have other
>more effective means now of dealing will them too.

You might consider using PIR motion detectors, like the ones used in
security systems.

John

From: John Fields on 30 May 2010 12:08
On Sun, 30 May 2010 06:25:27 -0700 (PDT), brent
<bulegoge(a)columbus.rr.com> wrote:

>I am looking for a light sensor like is used in a garage door system
>to detect if an object is between a light source and light sensor.
>
>I need something to put in my back yard to detect if someone is
>breaking through a particular path. It is like a light activated trip
>sensor , used for home security awareness, but I cannot figure out
>what this device is called so I can find it online to purchase.

beam break detector.

JF
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