Re: Car alarm that goes off when in a certain distance

["mikey" <loismustdie@xxxxxxxxx>]

<hiding@xxxxxxxxxx> wrote in message
news:gc75029fusdk8o81dbnvmhs8ki66o1fm5c@xxxxxxxxxx
> On Sun, 26 Feb 2006 08:03:09 GMT, Frank Olson
> <Use_the_email_links@xxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> >Karl Magnus wrote:
> >>
> >>>>>  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 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.
>
> Ok thanks for some of the suggestions, I looked up ITI transmitters
> and didn't see what I was looking for, I will have to dig a bit
> deeper.
>
> I really thought that there was some type of simple device out there
> that had a long life battery in it that I could just slap under the
> car. Then set up the reciever/dection sensor inside, and be done with
> it.

Radio Shack wireless doorbell and a mercury switch.


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