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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
Wow, thanks for the detailed post @allObjects!
Just a note that there are already two different RFID modules that have code and examples for them already - MFRC522 and PN532:
http://www.espruino.com/Search?kw=rfid
It looks like @allObjects has you covered, but in general it's easier to use hardware that we've already got working with Espruino.