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Automation > Data Input Ideas > RFID reader

RFID reader

It's very easy now to buy RFID (radio frequency identification) tags in a variety of formats, such as a credit card shape to carry in your wallet or a keyfob shape to attach to your keys. It's not too hard to build your own RFID reader, either.

The reader shown below came from a Jaycar kit and uses an onboard microcontroller to store tag IDs, but I've also built simpler readers that just pump the tag ID out the serial port whenever they have a successful read. They you can suck the number into a computer, make a decision based on the ID, and trigger whatever outputs you like: unlock the door, turn on the lights (but only if it's nighttime), start the TV and crank the central heating (but only if it's cold) all in one go if you like!