for this, I am think about making a 
timer driving food/water feeder
----- Original Message ----- 
From: "Timothy J. Weber" <tw@timothyweber.org>
To: "Microcontroller discussion list - Public." <piclist@mit.edu>
Sent: Saturday, December 06, 2008 11:02 PM
Subject: Re: [EE] Cat door


> cdb wrote:
> > 
> > :: My current [over]-design has RFID via a tag on the collar, IR beam
> > :: detection to avoid closing the door on the cat
> > 
> > Could you give some details of this implementation? I've been 
> > scrabbling around for ideas using RFID to allow the flap to be cat 
> > opened, with a beam or touch pad on the inside to relock the door. 
> 
> Sounds similar to what I'm doing.  I'm using this:
> 
> http://www.sparkfun.com/commerce/product_info.php?products_id=8419
> 
> But the range is more like ~4-5 cm in my experience, so next time I'd 
> try this one for more flexibility:
> 
> http://www.sparkfun.com/commerce/product_info.php?products_id=8628
> 
> And I'm using these tags:
> 
> TK4100KEY at <http://www.futurlec.com/RFID_Cards.shtml>
> 
> > The 
> > problem is, if the cat is being chased, I don't think the RFID field 
> > is sufficient enough to unlock with a hurtling 7.5kg cat followed by 
> > another feline hell bent on removing Fatso's rear leg.
> 
> That does seem to make it a significantly harder problem.  Fast enough 
> to open without impeding his hurtle, then close fast enough to repel 
> pursuer, without resulting in the occasional half-cat problem...
> -- 
> Timothy J. Weber
> http://timothyweber.org
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist