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Here's one variant: A fellow Westsailor by the name of Rick Kennerly
described much the same system as Bob did, but the "sensors" were wooden
clothespins
with thumbtacks as contacts, kept apart by thin plastic. I think Rick was in
the SoPac when he made it; I guess microswitches were in short supply or
didn't
fit the budget. I'd suspect that the maintenance on the contacts might get
boring after awhile.
John
"Seahorse"
lying Jax
Bob Austin wrote:
The easest alarms are very simple and will run on 12 volts. I have made a
number using a piece of plastic fairing compound spreader. Cut the 4"
spreader into four 1" pieces. Put a hole in the thicker edge. Put the thin
edge under a normally closed micro switch (Radio shack)--this makes the
circuit normally open. Attatch 30# monofiliment (fishing line) to the hole
in
the spreader piece. Attatche the other end of the monofiliment to the cover,
to a gate, cross it over the deck etc. If anyone pulls the monofiliment, it
pulls the wedge out of the microswitch. The micro switch is connected to a
relay--when the switch closes, it trips the relay, which then sounds a horn,
siren, strobe light etc--all Radio Shack. For $30 to $50 you can have a very
good alarm--for another $30 you get a solar charger. The alarm uses no
current, unless the monofiliment is pulled.
There are any number of other varients.
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