I'll be getting one of these for Dibs, the studio cat. The Petnet SmartFeeder is programmable, allowing you to set portions based on your pet's age and current weight. It then dispenses the food at intervals you establish.
And of course it has an iPhone app that lets you modify your settings even when you're not around. So this will be perfect for my loyal studio watch-cat who keeps an eye on things when I'm out being a nimble photographer.
The Petnet SmartFeeder is available at Amazon.com. If you decide to take a look, please click first on the Amazon ad tile shown on all pages of this site. Then search for the feeder.