If you can dream it, Arduino can help you build it - perhaps with a dash of MakerBot thrown in for good measure. The latest homebrew project to hit the ol' inbox sounds an alarm whenever you leave a room without a registered item. Doh (named in Homer Simpson's honor, we presume), uses a trio of devices to track items that you usually travel with, like your keys or a cellphone. After you've assembled the rather complex contraption, you affix color-coded RFID tags to your gadgets, before registering them with the Arduino-based host.
Engadget
See also:
wwws, Doh uses RFID and Arduino to help you remember your wallet, continues search for the 'Any Key'
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