Re: [OT] Pager for car alarm

["John Andrews" <groups@xxxxxxxxxxxxxxxx>]

Kimble

That is soooo cool!


----- Original Message -----
From: "kimble" <kim@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Wednesday, November 17, 2004 6:00 PM
Subject: Re: [ukha_d] [OT] Pager for car alarm


>
> big_red_frog wrote:
>
> > Something to make the car alarm trigger a pocket alarm so we know
in
> > the house if something is up.
> >
> > I have hunted on Maplin for pager etc, but can't find what I
want.
> >
> > The alarm has a grounding output, so should be easy to
intergrate.
> >
> > Anyone out there point me to something please?
>
> I live in an area plagued by oversensitive car alarms, some with
> identical sirens to mine, so I threw something together to do this
using
> a PIC and a Nokia data cable: PIC is connected to the siren line from
> the alarm, and when that goes high, sends "ATDnnnnnn" at
2400 baud to my
> old mobile (I'm lucky enough to have a SIM on the old OVP virgin
tariff,
> so no line rental).  I also provide power to the phone at 5V (which is
> just enough to keep the battery charged) from the same regulator that
> supplies the PIC, so the whole setup is nice and autonomous.
>
> I've got it set to dial my mobile, which is set to divert to the
house's
> landline (and thereby triggers ungodly
> deaf-alerting/sleeping-person-scaring stuff) when switched off at
night.
>
> Not the simplest solution, but I had the PIC stuff to hand, and it
> didn't require modification of the phone.  I have a friend with a much
> more elegant arrangement where a 12V relay connected across one of the
> number keys of a much more ancient mobile triggers the speed-dial.
>
> Of course the whole thing relies on having a mobile account with
nothing
> better to do, so as little line-rental as possible.  I don't know if
> there are any PAYG tariffs that will go a decently long time between
> top-ups these days.
>
> This idea has the distinct advantage of as much range as you could
> possibly need, and no extra pager unit to forget.
>
>
> kim.
> xxx
>
>
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>
>
> Yahoo! Groups Links
>
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