There are a lot of smart people on this group so I thought I would ask for
some help. We have a stray cat that we have adopted. He is an indoor
outdoor type of cat. My personal experience is if they started outdoors
they are very unhappy if you try to keep them in all the time. Well the
problem
Hi Tim
Just in case you didn't know, exactly this device has been built already and
is commercially available. It uses the subcutaneously implanted RFID
'microchip' that is used worldwide for identifying animals, and will let in
your cat(s) and only yours (you program which cat's to allow).
On the outside of the wood cat tunnel I would wind some
turns of copper wire that would be tied into an oscillator circuit. The
shorted turn would either kill the oscillator or shift its frequency
allowing the door to open.
I can build just about anything electronic or mechanical and have
There are plenty of magnetic or RF collar products available designed
for this purpose -- coupled with an actuated door flap. Do a little
googling, you'll find something you can buy cheaply enough.
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_http://www.ebay.com/itm/160942129905_
(http://www.ebay.com/itm/160942129905)
$50 shipped
That is the exact unit I use. 2 cats.
Replace battery about once every 6 months.
My cats in - all others out.
Took the cats about a day to figure it out.
Michail
In a message dated
That is just about what I am thinking of. I just worry that the loud
speaker announcing please return to the store and the flashing lights
might scare the cat! Just kidding of course. Wire loop and a small cap for
the cat. Then the sweeping oscillator for the door. Now I need to find the
circuit
On Dec 20, 3:37 am, Ray Fenwick rayfenw...@me.com wrote:
Just in case you didn't know, exactly this device has been built already and
is commercially available. It uses the subcutaneously implanted RFID
'microchip' that is used worldwide for identifying animals, and will let in
your cat(s)
Can't you just set the cat to download and install updates automatically? ;)
Ray
On 20 Dec 2012, at 21:20, Terry Kennedy terry+googleb...@tmk.com wrote:
On Dec 20, 3:37 am, Ray Fenwick rayfenw...@me.com wrote:
Just in case you didn't know, exactly this device has been built already and
is
Here is a link for a (old)patent on a vehicle in lane detector using
passive coils in the roadway. No circuit details but it sounds like what
Dan was talking about. 12 inch single turn coils in the road with a 100nF
cap in series. etc. The hard part of this project is figuring out what
the
