"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.