Making a Wearable NFC Bus Pass

[Stephen Cognetta] is trying to get the total number of things he owns down below 115, and he’s always looking for ways to streamline his life.

Toward this goal he dissolved his SF Transit Clipper Card in acetone to get at the NFC tag embedded inside. The tag consists of a tiny chip attached to an antenna the size of the card itself. It took about three days (video below the break) for the layers to separate and [Stephen] was able to extricate the tag.

He ended up trying a few different ways of storing the delicate chip and antenna, …read more

Paul Jacob Evans


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