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Car alarm that goes off when in a certain distance

Hi,
Hope someone can help with this.
I would like to be able to set up a alarm on a car. It would only go
off if the car got in certain distance of some point, say 100 feet.

In other words if the car drove up to where I work my alarm would
sound that the car is nearby.

I looked a bit for proximity alarms and really couldn't find much what
I was looking for. Any websites, adivce you could provide would help.
Thank you
 
M

mikey

Jan 1, 1970
0
You could do something with a timer on a transmitter / receiver set up but
it would be awkward. Garage door opener stuff falls in to that reception
range I suppose but it's RF, not very precise.

What about those dog fences? Can you bury a line?

If you just want to detect a vehicle driving up, that's easy. I guess I
should have asked that first.
Something like this maybe? http://www.smarthome.com/7172.html
Bass would have jumped in by now but he gets uneasy at any mention of
probes.

Hi,
Hope someone can help with this.
I would like to be able to set up a alarm on a car. It would only go
off if the car got in certain distance of some point, say 100 feet.

In other words if the car drove up to where I work my alarm would
sound that the car is nearby.

I looked a bit for proximity alarms and really couldn't find much what
I was looking for. Any websites, adivce you could provide would help.
Thank you


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F

Frank Olson

Jan 1, 1970
0
Hi,
Hope someone can help with this.
I would like to be able to set up a alarm on a car. It would only go
off if the car got in certain distance of some point, say 100 feet.

In other words if the car drove up to where I work my alarm would
sound that the car is nearby.

I looked a bit for proximity alarms and really couldn't find much what
I was looking for. Any websites, adivce you could provide would help.
Thank you


That's easy if you have an Ademco or DSC wireless system that
annunciates "trouble" for a missing transmitter. You'd have to program
a transmitter into your system, set up a relay correlation to either
turn on a light or start a local buzzer when it's actually "present" in
the system, and place the transmitter on the car you wanted to monitor.
If it's within 200 feet of the receiver, the light/buzzer would turn
"on". If it's out of range (or the battery's dead), the light/buzzer
would be "off". The down side is that your system would also display
"trouble" for the missing transmitter, but I think if you set it up on a
different partition you could get around that.

Frank Olson
http://www.yoursecuritysource.com
 
M

mikey

Jan 1, 1970
0
Frank Olson said:
That's easy if you have an Ademco or DSC wireless system that
annunciates "trouble" for a missing transmitter. You'd have to program
a transmitter into your system, set up a relay correlation to either
turn on a light or start a local buzzer when it's actually "present" in
the system, and place the transmitter on the car you wanted to monitor.
If it's within 200 feet of the receiver, the light/buzzer would turn
"on". If it's out of range (or the battery's dead), the light/buzzer
would be "off". The down side is that your system would also display
"trouble" for the missing transmitter, but I think if you set it up on a
different partition you could get around that.

Frank Olson
http://www.yoursecuritysource.com

Not that easy. You've got the concept but it's not that fast, Frank. It
depends on the window.
My guess is the systems you mention are probably at least an hour, the car
has
come and gone by then :)


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F

Frank Olson

Jan 1, 1970
0
mikey said:
Not that easy. You've got the concept but it's not that fast, Frank. It
depends on the window.
My guess is the systems you mention are probably at least an hour, the car
has
come and gone by then :)


Yeah... You'd need something that transmitted continuously which would
mean you'ld have to either hard wire the sucker to the vehicle's
electrical system (can a 9 volt transmitter work on 14 volts?? I don't
think so), or trip some sort of relay... easy enough to do if wire it
to the ignition. Turning the engine off would energize the relay and
open the contacts to the transmitter (it would transmit the open)
instantly and accomplish two things... It would "log" back on to the
security system and show an open zone. Starting the car would have the
effect of "closing" the zone. The problem I see is that it sounds like
the OP won't have that kind of access to the vehicle. A more
clandestine approach is required. Like one of those card transmitters
from HID. The reader for that guy's expensive though... and you'd need
a head end unit to power it as well...
 
F

Frank Olson

Jan 1, 1970
0
Karl said:
I have done this. I used a ITI transmitter (long life) and a Mercury
switch attached to the input terminals. Dip the transmitter (once
programmed in to your system) in that stuff they sell to coat your tool
handles for protection. Then mount it on the "ledge" underneath the
front t bumper or somewhere else. As a call pulls up and slows
down/parks, the mercury will shift back and forth causing the
transmitter to transmit. On the ITI stuff, you can put it in group 25
(older panels) and it should be "non-supervised". This will cause the
alarm to chime anytime the car pulls up withing range.

KM


Excellent solution, Karl. I didn't realize they still sold mercury
switches (what with the environmental concerns and all). I suppose any
good movement detection switch would work (and automotive types would be
weather-proof too). While I'm thinking about this we should also warn
the OP that you can't guarantee the range on the transmitter will always
be optimal. I'm not sure what to suggest about that as I've often found
the position of the transmitter can affect the signal strength/range.
 
K

Karl Magnus

Jan 1, 1970
0
I have done this. I used a ITI transmitter (long life) and a Mercury
switch attached to the input terminals. Dip the transmitter (once
programmed in to your system) in that stuff they sell to coat your tool
handles for protection. Then mount it on the "ledge" underneath the
front t bumper or somewhere else. As a call pulls up and slows
down/parks, the mercury will shift back and forth causing the
transmitter to transmit. On the ITI stuff, you can put it in group 25
(older panels) and it should be "non-supervised". This will cause the
alarm to chime anytime the car pulls up withing range.

KM
 
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