Watch Attachment NFC Contactless Payment
thingiverse
Inspired by https://www.instructables.com/id/RFID-NFC-Tap-and-Go-Ring-for-Credit-Card-Payment/#discuss Things I Used: Cracked Revolut Card Old/Broken Wired Headphones 2 Part Epoxy Solder Iron and Wire. Follow Instructables Guide to Removing Chip from Card. Chip Has Built-In Antenna but Too Small for Consumer Use, So We Have to Extend It. Cut Trace on One Side of Card - Its the Trace for Built-in Antenna. See Images Above for Where to Cut and Solder. This Trace Needs Cutting or Won't Work as Is. For Coil Antenna, I Used Approximate 36cm of Wire from Old Headphones. This Will Give Approximately 6 Turns on 3D Printed Image. Adjust for Watch Strap Thickness by Trying Adjusting Z Dimension - Was a Tight Fit for My Watch Strap. Place Chip in Indent, Feed Wires Through Small Holes, Solder to Circled Pads in Image, Epoxy All in Place. Test Device Before Assembling and Definitely Before Epoxying. Range is About 1cm Due to Coil Not Being Tuned Right.
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