"carl mciver" wrote in message
nk.net...
"SteveB" wrote in message
news:zA3qe.9581$tr.3714@fed1read03...
| My two dogs go to my back gate, and just raise a fuss when a dog walks
by
on
| the outside of the gate. They cannot see through the gate, except for a
| couple of small spaces.
|
| I want to set up a horn with an electric eye, so that when they go close
to
| the gate, it will sound. This will only come on if they go really close
to
| the gate, so it won't get them if they just stand back and bark.
|
| My Lab got a cut by her eye, and I am sure that it is from where the
small
| spaces are, and she was trying to stick her head through.
|
| Can you steer me to what I need? Would I just go to Radio Shack and
talk
to
| the nerds there? How much do you think this will cost?
|
| Steve

A simple motion sensor will give you a larger field of view
(adjustable
via the lens) than a narrow fielded eye, and you can connect it, likely
via
relay, to any siren/repeller/etc you want.


Be aware that your typical PIR (Passive IR) motion sensor is almost blind
during the day when it is bright out - especially if the air /ground temp is
anywhere near the body temp of the animal (been down this path). You
could run an IR beam across although it is probably not worth the time -
they will simple change their habbits slightly (or ignore the horn -- or
even
worse, start howling with the silly thing !!)

mikey