Xref: utzoo rec.autos:20969 rec.autos.tech:9759 sci.electronics:7318
Path: utzoo!utgpu!watmath!att!bellcore!rutgers!usc!randvax!zorin!chris
From: chris@zorin.UUCP (Christopher Nielsen)
Newsgroups: rec.autos,rec.autos.tech,sci.electronics
Subject: Re: Car Alarms
Summary: sensors...
Message-ID: <191@zorin.UUCP>
Date: 8 Aug 89 07:11:16 GMT
References: <5501@pt.cs.cmu.edu> <446ab2ec.f87f@gtephx.UUCP> <5835@stiatl.UUCP> <273@escargot.UUCP>
Distribution: na
Organization: Zorin Data Systems, Inc., Santa Monica, CA
Lines: 44

In article <273@escargot.UUCP>, chrisb@escargot.UUCP (Chris Bradley) writes:
> In article <945@pedsga.UUCP> vatche@pedsga.UUCP (Vatche Daghlian,SPCSYS,7546) writes:
>
> The sensor is made out of mercury filled tubes with an inductive pickup around
> each one. They both are used to determine the position of the vehicle in the
> right to left fashion and the forward to rear fashion.
> 
> ...
>
> The most important thing in any alarm system is the sensor. Since Mercury
> won't freeze in normal human temperatures, your sensor won't come out of
> 
> -->Chris

Interesting stuff...

As I wrote a few months ago, I built my own car alarm out of a Radio Shack
Model 100, and an interface. I am using one of the Radio Shack shock
sensors. I don't think this is mercury, though. I seems to work ok, but 
I think it could be a bit more sensitive. Since I have written the program
to function as the alarm, I can cancel out the first 'bump', or even the 
second, within a specified time... etc.

I am interested in sensors, and the one you mentioned on the UNGO sounds
much better than the one I'm using now. Can I get one seperately? How much?

Also, what about sound descriminators, and other types of sensors? Are
door switches much worth using if you have a shock/motion sensor? Someone
who once sold car alarms should have some opinions on such things....

Now I just have to get the service manual for my car, and figure out how
to interface to the diagnostic port under the hood, or something to disable
the engine if in alarm mode... Gee... I wonder what intersting bits of
information I can decode out of those diagnostic connectors? BTW this is
'89 Jeep Cherokee, should anyone already know....

Christopher A. Nielsen
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