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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
Hi Chris,
Yes, it sounds like it can be used just fine and will wire straight on. You don't need a USB-TTL converter - that's if you want to connect Espruino to a PC, but don't want to use the on-board USB socket.
Adafruit also made an Arduino Library for it - while you can't use the library in Espruino, it shows how simple the reader is to use (just a few bytes of data to send). You should be able to get it running pretty quickly.