Here’s an older project by Micah Dowty, that I just found out about: a homebrew soft circuit RFID tag. Not content to just make a homebrew RFID reader using a Propeller microcontroller, he proceeded to design an RFID tag using only an ATtiny85 microcontroller and an inductor, and built an antenna for it using conductive thread. The result: a completely homebrew RFID setup, which is compatible with EM4102-style RFID tags. Awesome!
Micah is also the hacker extraordinaire who performed the sewing machine upgrade we covered recently.
In the Maker Shed: