Another cool sensor here that I saw in the LEGO Education catalog- the Codatex RFID Sensor. I don't own it (it's price of $139.95 is a little outside my budget), but it seams to work by reacting to these black cards. If this is true, then it seams to be a very cool technology. Just think of the possibilities; a LEGO door lock that only opens when shown one of the disks, a vacuuming robot (similar to Roomba) that avoid certain areas of a room, even a servant robot that will follow it's human master and tend to its every need (I'd like to see that one). Anyway, here is one of the few videos out there that displays the RFID Sensor:
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