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NXT RFID Reader
The biggest limitation of the Lego NXT system for people looking to use sophisticated sensors is the brick's lack of a serial UART. A straightforward solution exists in the form of a cheap microcontroller acting as a UART to TWI(I2C) bridge. Here is an example of using a $4 microcontroller to integrate a Parallax RFID Reader with a Lego NXT.
The two-wire interface allows the NXT to read tag IDs, read the number of tags in the input FIFO, clear the tag input FIFO, put the RFID Reader into...
Related topics : rfid tag reader system / rfid tag sensor input / cheap rfid tags and readers
RFID Garage Door Control
By placing an RFID tag inside my wallet I can open my garage door when I get home from work on my bicycle by simply placing my wallet close to an RFID reader that is mounted on the inside of my garage. The reader is made by Parallax and I purchased a few of them for $10 each when RadioShack was closing them out. The reader talks to a microcontroller that validates the tag number and checks to see if the tag is cleared for entry at the current time of day.
Related topics : rfid door controller / rfid tag and reader working
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