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Old 01 May 2003, 11:18   #1
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Country: UK - Wales
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Boat Anti Theft Alarm

I am in the process of putting together a circuit diagram for a relatively simple anti theft alarm for RIB / Trailer.

My current thoughts are:

Vibration sensor for when on trailer on drive - which can be disabled when on moorings.

Microswitches on hatches - jockey seat lids.

Current sensing for starting of engine.

Possibly microwave detector with a warn away function.

For on the drive I am looking at a radio link into the house alarm which already has an auto dialer to my mobile.

When moored I was considering a link via a PMR446 as generally I would not be more than a mile away from the boat.

All battery backed up for if disconnected from main battery.

Can anyone think of any other nice to have functions or advice on anything they have done.

GPS and GSM although fantastic to have is a bit out of scope both for cost and battery drain. As at least the GPS would have to check its position every 5 - 10 minutes to be effective and would ideally have a permanent sat lock.

Any ideas or advice is greatly appreciated.

Cheers

Mike
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Old 01 May 2003, 14:02   #2
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Have a search as there have been a couple of interesting ideas posted in the past. iirc GaryGee had a very interesting idea that sounded quite well developed.

In fact, have a look here:

http://rib.net/forum/showthread.php?...ighlight=alarm
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Old 01 May 2003, 15:46   #3
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Blimey Mike,

I guess it's still hairy in Buteown then. If the thieving gits manage to get past all your security I think you can fit trackers to engines nowadays.

Hope you are well

Stuart
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Old 01 May 2003, 17:10   #4
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Bear in mind that PMR446 is voice only, and if your caught using it for owt else you could be facing a fine. How about one of those systems with a GPS and mobile that detects when the boat is moved, and sends the coordinates to you via SMS at regular intervals?

Of course, when it's on the drive, the microswitches etc linked up to a bloody loud siren'll do the trick. Alternatively buy one of them metal RIB type things and connect it up to the mains at night. Gives the kids a light show too.

Matt
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Old 01 May 2003, 17:29   #5
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Quote:
Originally posted by narked
connect it up to the mains
I've got a couple of 15kv step-up transformers if anyone wants one (tenner a piece). You don't even need to touch the goods, just come near them and you'll get a zap! your risk though
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Old 01 May 2003, 17:55   #6
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Hmm interesting. Company I work for develops and sells wired and wirefree burglar alarms amongst other things. The wirefree stuff all works on 433Mhz with PIR and Magnetic Contact sensors linked to a solar powered alarm & autodialler. Wonder whether you could get some kind of movement sensor on the trailer so if it is tampered with it sounds the house alarm and dials the recipient. Perhaps we have a market opportunity here!
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Old 01 May 2003, 20:18   #7
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Cheers Everyone.

Stuart - not sure Butetown is particularly any rougher than other areas but I can see a RIB sat on a drive getting some unwanted attention. Hope the business is going well and don't forget to drop me a line when your in this neck of the woods.

Narked - Certainly like the electrified trailer idea ! but not sure my cat would ! The PMR link is dead easy as I would only use on occasions the boat is away from the house. Set one to VOX leave it by the alarm in the (hopefully unlikely) event it goes off will hear the alarm on the other.

Alan, my house alarm sounds like it could be one of yours ! I'm not sure the best way of doing it but there are two options as I see it. The door sensors simply have a reed switch to activate the transmitter this could easily be replaced by a vibration sensor or mercury switch which will trigger when the trailer is moved. Or so that everything is cover I was going to try and create an output from the alarm unit on the boat to trigger the transmitter.
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Old 02 May 2003, 05:17   #8
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My Car alarm alarms the trailer as well. when the light board is plugged in it blips twice more to say so and if you move the trailer the motion sensors in the car go the alarm comes on and all the lights including the tail board flash. It is very temperamental though as a bike or boy racer exhorts or lorry will set it of.
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Old 02 May 2003, 12:44   #9
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Buy a house with a double garage.

Sounds the cheapest option to me.

I've had to specify that my boat will be parked in a boat park that doesn't have locking gates on my insurance declaration.

Not sure I've seen one with gates on the Isle of Man!
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Old 02 May 2003, 13:50   #10
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Double Garage !!! I wish. The're a bit hard to come by in central Cardiff. It was hard and expensive enough to find one with a drive big enough for a car and boat.

Seriously - I've had a car (boat) port put on the side of the house over the drive (drive isn't wide enough for a garage). By the time the boat arrives this will have doors on the front. Hopefully this wheel clamps and possibly a security post in front will do as much as possible to stop the boat disappearing. I am more bother about damage while trying to take the boat or parts - anchor / VHF etc disappearing, hence the alarm.

I expect to have to declare that the boat is not in a garage but the insurance companies I have approached appear to be happy with an approved wheel clamp.

Cheers

Mike
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