Cat detector

[Dan]

So my cat sneaks out when people come in/out the door.
She's an indoor cat, but very sneaky. I don't mind too
much except when its like -5 out and the wife sends me
out at midnight to find the stupid cat.

How can I detect when a cat is in the doorway? I was
thinking an optical sensor about 5" from the floor in
the doorway but I don't want it to detect everything,
just this one cat. Is there some simple detector I can
make for a simple RFID tag (attached to the cats collar)?
I don't know anything about RFID tags. Where does one
even get them in small quanities (other than steal an
item of clothing with one of them embedded in it)?

I have read a little online about resonant circuits
and using a wire loop as part of a detector circuit
(I guess thats really a simple RFID tag), but I didn't
find enough info to help me build anything. For the cat,
I need something thats not powered and small enough to
attach to a cat collar.

Any helpfull thoughts?

Thanks.

dan

 

[Mike Fields]

So my cat sneaks out when people come in/out the door.
She's an indoor cat, but very sneaky. I don't mind too
much except when its like -5 out and the wife sends me
out at midnight to find the stupid cat.

How can I detect when a cat is in the doorway? I was
thinking an optical sensor about 5" from the floor in
the doorway but I don't want it to detect everything,
just this one cat. Is there some simple detector I can
make for a simple RFID tag (attached to the cats collar)?
I don't know anything about RFID tags. Where does one
even get them in small quanities (other than steal an
item of clothing with one of them embedded in it)?

I have read a little online about resonant circuits
and using a wire loop as part of a detector circuit
(I guess thats really a simple RFID tag), but I didn't
find enough info to help me build anything. For the cat,
I need something thats not powered and small enough to
attach to a cat collar.

Any helpfull thoughts?

Thanks.

dan

In looking through today's selection of fine junk mail, I came
across this gadget for $200 that is actually pretty cool and
comes with 10 RFID tags ..
http://www.smarthome.com/74342.HTML

mikey

 

[Ban]

In looking through today's selection of fine junk mail, I came
across this gadget for $200 that is actually pretty cool and
comes with 10 RFID tags ..
http://www.smarthome.com/74342.HTML

mikey

The range is only 100mm (4")

 

[xray]

So my cat sneaks out when people come in/out the door.
She's an indoor cat, but very sneaky. I don't mind too
much except when its like -5 out and the wife sends me
out at midnight to find the stupid cat.

How can I detect when a cat is in the doorway?

I want the same thing for my neighbors cat. My solution requires no
special equipment to be present in the cat.

The nasty animal has decided my door mat is a cat scratch toy and has
taken my mat that had no noticeable wear in 10 years to a worn mess in a
couple months. I poured ammonia around a few times. It continues.

Somebody's pet is just a pest to me. Any ideas how to make it go away?

 

[Brian]

I want the same thing for my neighbors cat. My solution requires no
special equipment to be present in the cat.

The nasty animal has decided my door mat is a cat scratch toy and has
taken my mat that had no noticeable wear in 10 years to a worn mess in a
couple months. I poured ammonia around a few times. It continues.

Somebody's pet is just a pest to me. Any ideas how to make it go away?

Are you in a police state or in the US?

 

[Guy Macon]

Are you in a police state or in the US?

Yes.

Are you a primate or a mammal?

 

[Zak]

The nasty animal has decided my door mat is a cat scratch toy and has
taken my mat that had no noticeable wear in 10 years to a worn mess in a
couple months. I poured ammonia around a few times. It continues.

Somebody's pet is just a pest to me. Any ideas how to make it go away?

Bleach instead of ammonia? High voltage (take care to limit the current
- and the voltage so shoes are adequate protection ?


Thomas

 

[Rich Grise]

So my cat sneaks out when people come in/out the door.
She's an indoor cat, but very sneaky. I don't mind too
much except when its like -5 out and the wife sends me
out at midnight to find the stupid cat.

You need to train your wife.

The damn cat will come back when it gets hungry. It knows where the can
opener is.

Let the evil thing go.

How can I detect when a cat is in the doorway?

By watching when you go in or out?
....

Any helpfull thoughts?

Yeah. Let the damn thing go. If your wife is _that_ addicted to cat shit,
then you should let her go too.

Good Luck!
Rich

 

[Rich Grise]

Bleach instead of ammonia? High voltage (take care to limit the current
- and the voltage so shoes are adequate protection ?

Nah. Just a set of parallel wires, spaced about 1/4", with alternate wires
connected to opposite sides of the line.

Or you could trap it and "take it to the pound". >:->

Good Luck!
Rich

 

[Spehro Pefhany]

You need to train your wife.

The damn cat will come back when it gets hungry. It knows where the can
opener is.

Let the evil thing go.


By watching when you go in or out?
...

Yeah. Let the damn thing go. If your wife is _that_ addicted to cat shit,
then you should let her go too.

Good Luck!
Rich

http://www.speff.com/pic09758.jpg



Best regards,
Spehro Pefhany

 

[John Woodgate]

I read in sci.electronics.design that xray <[email protected]>

Somebody's pet is just a pest to me. Any ideas how to make it go away?

Get your own cat.

 

[Bob Stephens]

So my cat sneaks out when people come in/out the door.
She's an indoor cat, but very sneaky. I don't mind too
much except when its like -5 out and the wife sends me
out at midnight to find the stupid cat.

How can I detect when a cat is in the doorway? I was
thinking an optical sensor about 5" from the floor in
the doorway but I don't want it to detect everything,
just this one cat. Is there some simple detector I can
make for a simple RFID tag (attached to the cats collar)?
I don't know anything about RFID tags. Where does one
even get them in small quanities (other than steal an
item of clothing with one of them embedded in it)?

I have read a little online about resonant circuits
and using a wire loop as part of a detector circuit
(I guess thats really a simple RFID tag), but I didn't
find enough info to help me build anything. For the cat,
I need something thats not powered and small enough to
attach to a cat collar.

Any helpfull thoughts?

Thanks.

dan

How about those dog collars which give a mild shock if the critter
transgresses a perimiter sensor?


Bob

 

[Ken Smith]

I read in sci.electronics.design that xray <[email protected]>


Get your own cat.

Yes, ideally a large tom short hair semi-wild cat. If you get one as good
as I had, you won't have trouble with other cats coming in your yard. For
that matter you won't have trouble with dogs either.

Barring that, some pet stores sell stuff that cats hate the smell of. It
seems to really work.

 

[Ken Smith]

The damn cat will come back when it gets hungry. It knows where the can
opener is.

Actually it may not. An in door cat can become lost easily. The the
outdoors map has not been downloaded into the route finding software.

 

[Rene Tschaggelar]

So my cat sneaks out when people come in/out the door.
She's an indoor cat, but very sneaky. I don't mind too
much except when its like -5 out and the wife sends me
out at midnight to find the stupid cat.

How can I detect when a cat is in the doorway? I was
thinking an optical sensor about 5" from the floor in
the doorway but I don't want it to detect everything,
just this one cat. Is there some simple detector I can
make for a simple RFID tag (attached to the cats collar)?
I don't know anything about RFID tags. Where does one
even get them in small quanities (other than steal an
item of clothing with one of them embedded in it)?

I have read a little online about resonant circuits
and using a wire loop as part of a detector circuit
(I guess thats really a simple RFID tag), but I didn't
find enough info to help me build anything. For the cat,
I need something thats not powered and small enough to
attach to a cat collar.

Any helpfull thoughts?

Unless you really want to stick to hightech stuff to
solve trivial problems, there are more foolprof
solutions. For whatever reason a cat of mine chooses
to pee on shoes. So how can I prevent the cat from
reaching this area ? Since this cat doesn't jump more
than 60cm, I made an 80cm high gate from some plywood
that separates this area from the rest.

No empty batteries and nothing else interferes in this
aim. Checking whether this gate is open doesn't require
equipment either.

Rene

 

[Mike Fields]

In looking through today's selection of fine junk mail, I came
across this gadget for $200 that is actually pretty cool and
comes with 10 RFID tags ..
http://www.smarthome.com/74342.HTML

mikey

OK, OK, so I went a few pages farther in the same flyer and
found this gadget for $59 that only responds to your cat ...
http://www.smarthome.com/6106.HTML
( I am always snooping in catalogs like that for ideas for
cute little gadgets to make for my house etc.)

mikey

 

[Ian Stirling]

I want the same thing for my neighbors cat. My solution requires no
special equipment to be present in the cat.

The nasty animal has decided my door mat is a cat scratch toy and has
taken my mat that had no noticeable wear in 10 years to a worn mess in a
couple months. I poured ammonia around a few times. It continues.

Somebody's pet is just a pest to me. Any ideas how to make it go away?

Piss on the door.
(or on the cat, if you can hit it.)
The smell reportedly deters cats.

 

[Don Pearce]

Piss on the door.
(or on the cat, if you can hit it.)
The smell reportedly deters cats.

No, you go to the local zoo and ask for a bottle of tiger piss. Spread
a bit of that around and there won't be a cat for miles.

d

Pearce Consulting
http://www.pearce.uk.com

 

[Richard Henry]

No, you go to the local zoo and ask for a bottle of tiger piss. Spread
a bit of that around and there won't be a cat for miles.

Just exactlly how does the zoo collect tiger piss?

 

[Don Pearce]

Just exactlly how does the zoo collect tiger piss?

Well, it is certainly true that you only take the piss out of a tiger
once...

d

Pearce Consulting
http://www.pearce.uk.com