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Using an Parallax ultrasonic sensor, an Arduino and a computer this Ultrasonic Cat Water Dish Monitor project will allow you to monitor the cat dish level from anywhere. "Alright, so I’ve had this done for a little while – all I had to do was flip the switch on it. So here is the current setup:
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I think a cool upgrade would be monitoring and record the time and frequency of usage and temperature. It would be cool to see an increase of water drinks as the temperature in the house got warmer. 
March 30th, 2009
That’s a neat application, but I wonder how cats would react to the ultrasonic “chirp” if they were present when the level was being checked. I haven’t been able to get a good answer as to how high a frequency cats can hear, though I checked around a while back.
I’ve got one cat who hides when he heard wind chimes, but I’m not certain if he’s bothered by the fundamental or harmonic frequencies.
March 30th, 2009
Yeah I tested that before I put it all together, she either can’t hear it at all or just doesn’t care. I’m leaning towards “can’t hear nothin” because she is a pretty curious cat and would have chewed it up by now if it annoyed her.
March 31st, 2009
Very cool, but…..WHY?
Please don’t say “because I/he/we can” Give a real reason.
September 18th, 2009
Just for fun.