|
Posted by Gunner Asch on June 17, 2008, 6:10 pm
Please log in for more thread options
>Randy wrote:
>> My shop has no windows so on nice days I like to keep the overhead
>> door open. Well some kid watched me welding for awhile then decided
>> it was safe - snuck in and stole my laptop computer that was connected
>> to my CNC mill.
>>
>> Got him on video, filed a police report.
>>
>> I need some kind of photocell and beam across the doorway to alert me
>> if anyone walks in. Can garage door safety beams be used? I have a
>> couple of friends that can wire up or build me a circuit to make them
>> work, I just don't know how the work, is there a NO or NC output on
>> those? I was told you cannot just jumper them out, so I'm thinking
>> it's more like a signal output rather than a switch closure output.
>>
>> Thank You,
>> Randy
>
>I know one place that uses an am or fm radio. When a person activates a
trigger (Opens
>the door and finds themselves inside a small cubicle) the radio blares out at
about 120
>db. - in the shop but well heard in the cubicle.
>
>You can use many different triggers. The beam works fine but leaves a visible
trail in
>dusty or smoky conditions. You may want to install one to give them something
to dance
>around while they activate another one. :-)
>
>A very simple motion sensor works well. You can rig a flood light sensor so
that a bulb
>comes on or you can screw in a plug and have it activate the above mentioned
radio or
>anything you can plug into that outlet. Sensor does not have to be mounted on
the flood
>bulb set.
>
>Personally, I'd use a couple different switches so they never know what or
which triggered
>the notice or you may make them progressive. The first one could turn on a
light or
>sound a small chime in the location you expect to be in. This one could
figuratively say,
>"Someone just rounded the corner of the building." The next one could sound a
different
>alarm and let you know their progression. The time lapse in between the two
would tell
>you their approx. speed (sneaking, running, etc.) When they walk past a
yellow lined
>do-not-enter area (or whatever you choose) you could make it sound like all
hell has
>broken loose! This way they'd know that you knew! Bells, whistles, lights,
the works! :-)
>
>It can be as simple or complex as you wish to make it. First, You need to
know. Second,
>They need to know that you know. They could be casing the place for a return
when you're
>not around. You can get auto dialers to call you or anyone else if the place
is entered
>during certain periods of time. I know of one auto dialer that calls several
different
>numbers and announces that a high level alarm has been triggered or that there
seems to
>have been a bearing failure in a lift station - giving the identity of the
station.
http://cgi.ebay.com/WIRELESS1000-Optex-wireless-visitor-Annunciator-NIB_W0QQitemZ190229375542QQihZ009QQcategoryZ41969QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
crom...but its not rocket science.
ebay search on "optex" or 'door annunciator'
If worst comes to worst, drop me an email and i can probably come up
with a set or two of paired photo beams used in industry from my stuff
Gunner
at yoyodyne they were all veterans of the psychic wars
exiled from the eighth dimension where the winds of limbo roar"
mariposa rand mair theal
| 
Yahoo! 
Google 
Windows Live 
del.icio.us 
digg 
Netscape 
XML Sitemap
> door open. Well some kid watched me welding for awhile then decided
> it was safe - snuck in and stole my laptop computer that was connected
> to my CNC mill.
>
> Got him on video, filed a police report.
>
> I need some kind of photocell and beam across the doorway to alert me
> if anyone walks in. Can garage door safety beams be used? I have a
> couple of friends that can wire up or build me a circuit to make them
> work, I just don't know how the work, is there a NO or NC output on
> those? I was told you cannot just jumper them out, so I'm thinking
> it's more like a signal output rather than a switch closure output.
>
> Thank You,
> Randy
>
> Remove 333 from email address to reply.