Mlarsen writes -
In this instructable I will explain how to make a simple RFID pet food access control system. This system uses a stand-alone RFID system that can be purchased either pre-assembled or in kit form if you desire to do the soldering yourself, and also wish to save a few dollars in the process.
The reason I made this was out of pure necessity. I have two dogs, and when my vet placed one of them on a special diet I needed some way to ensure they ate their own food… and only their own food. Since they are open-bowl fed and I’m gone part of the day, I decided to look for a product that would do what I needed. This meant I wouldn’t have to spend a great deal of time trying to re-train them and still give them the freedom to eat whenever they chose. This is where my frustrations begun…
HOW TO – Make a RFID pet food access control system – Link.