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Subject: Re: [worldcruising] proximity alarm
From: Chuck Morford (chuckmorford@XXX.XXX)
Date: Wed Nov 28 2001 - 07:06:22 EST
Buy a cheapie home alarm system...
Most of them will come with an infrared sensor...
The better ones will come with a "dual" sensor, IR and RF sensing combined, to reduce false
alarms...
Most of the sensors will run on 9vdc or 12vdc and will provide a jumper selected normally open or
normally closed circuit, and should not require the alarm to actually be installed to operate...
Radio Shack sometimes has alarm components for sale separately...
Chuck (Alarm installer in a former life...)
--- "S/V Aramoana (Roger Chin & Eric Register)" <aramoana@XXX.XXX> wrote:
>
> I have always wanted to do that. Unfortunately, finding cheap 12v infrared
> sensors with a large enough field of view is difficult. I purchased some
> 120vac sensors in the hope of converting them but unfortunately I think
> they relied on the 60hz ac as a "clock". Ultrasound sensors wouldn't work
> with all the movement on a boat.
>
> I have thought about putting sensors on either side but that leaves the bow
> and stern vulnerable. Another thought was to put it under the spreaders
> but I doubt if the sensitivity would be good enough (and I can't route new
> wires through the mast anyway). If the latter worked, I would think only
> one would be sufficient for coverage.
>
> If you get any ideas, please let me know. I've always wanted to turn the
> spreader lights on BEFORE boarding the boat.
>
> Roger Chin
> S/V Aramoana
> http://www.geocities.com/sv_aramoana
>
> At 10:14 PM 11/27/01, BeckyBernard Robinson wrote:
> >Does anyone have a plans or leads on how to make a 12v proximity
> >switch, so the spreader lights come on when one approaches the boat.
> >Seems like a great idea for both when coming to the boat at night and
> >letting unwanted boarders know they may be being watched.
>
>
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