Video: ultrasonic water level dish pings owner when kitty needs a drink
Arduino, Parallax range finder, some scrap wood and a good deal of wires in order to measure when the water bowl needs to be refilled. He's still working to get the contraption to send him a Tweet when the level gets below a certain point, and we can only assume that part II will see an automatic refilling tool hooked in to said alerting system. And you thought pets had it good before the advent of technology...
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