Panama wrote:
I'm looking for design ideas and components for an intrusion alarm for
the boat. A friend bought 2 IR xmit and 2 IR receiver units to mount
in the cockpit, but my thought is that irregular sunlight bouncing off
waves, etc is going to set this arrangement off.

Thieves and vandals prefer the cover of darkness, making a motion sensor
light the most effective deterrent. Break the beam, the boat is flooded
with it. Higher end motion sensors can be adjusted for the amount of
"bulk" required to break the beam, which would prevent birds and flying
insects from setting 'em off.

--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/html/get_ri...oat_odors.html