Dave Bryan added a Raspberry Pi and a couple of continuous-rotation servos to a commercial cat feeder to make it dispense automatically:
Back in February I started teaching my Raspberry Pi 101 class at The Hack Factory. After the first class I think I had Pi on the brain, I was scheduled for a quick weekend trip out of town with my girlfriend, and she was due to leave her two cats behind. She said that she was going to leave a large bowl of cat food out, and with that I suggested that I build an automated cat feeder for them.
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