Here’s a neat little bit of DIY engineering. London-based freelance digital art director Dhani Sutanto has created his own wearable transit pass by gutting his public transportation pass card and implanting its electronics in a ring.
The Oyster card, as it’s called, includes an RFID chip and antenna. For his homemade ring pass, Sutanto removed the tag and antenna from the card using nail polish remover, wound the antenna loop into a smaller circle to fit his resin mold, and then cast a prototype ring. The initial version has to be removed to activate the reader, but he plans to make another version that casts the loop in the ring’s surface.