Or,
Just use the IR detector to actuate a solenoid connected to a full choke 12
gauge shotty's trigger Make sure it's pointing at the detected area.
I reckon the cat would go one way or another.
Jock

"Cristian Croitoru" wrote in message
...
| There was a question a while ago he
| how to stop cats using the soil around the flowers as litter box?
|
| I have a neighbour with a roaming (!) cat. This cat, for a reason, loves
one
| particular chairs on my porch and over night takes (I presume) great
| pleasure in using it. I like cats but I don't like cats' fur and hairs and
| that chair is full of it, regardless how often I clean it. Nothing worked
in
| convincing the cat to stop using my propriety.
|
| So I modified a water computer with a humidity sensor to use an infrared
| light beam barrier as cat detector. a small sprinkler well oriented did
the
| job, for a few nights I could hear the electrovalve kicking in, a cattish
| spitting noise and the sound of the furry thing clearing the space. Worked
| like a charm.
|
| So I can see no reason why you can't use a similar solution for your
flower
| beds..
|
| Good luck
|
|