Cats love to hunt, but they don’t get the opportunity to do so in your home. Ben Millam’s smart pet feeder can help. It makes your pet work for its food. As he explains on his blog, you should train your pet using ‘clicker’ training before trying something like this. This smart pet feeder rewards your pet for the balls it finds.
The developer used a smart feeder, Arduino Uno, RFID, and a few other parts to pull this off. More information is available here.