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...
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Frustrated with the situation, I decided to roll my own. This first version does the job, but I would eventually like to make the antenna extend around the entire perimeter of the bowl. If anyone has experience with RFID technology, I would appreciate any feedback that would assist in modifying the antenna into that configuration.
***** UPDATE *****
Anthony Targa, holder of patent #5570655 contacted me. Apparently he DID manufacture the device and it was featured in numerous Veterinary publications. Because of this, I fully retract my "patent troll" statement. I simply wish Anthony's device was produced on a larger scale so more people could have access to it.