Matt Varian's Wemos D1 Mini-Based NFC-WiFi Board Makes Interaction as Quick and Easy as Possible

Featuring a custom-designed 3D-printed housing, the NFC-WiFi Board came about when Varian was looking to make use of an NFC implant.

Maker Matt Varian was looking for an easy way to make use of a near-field communication (NFC) implant installed in his hand, and came up with a compact solution: the NFC-WiFi Board, powered by the Wemos D1 mini microcontroller.

"I have a NFC implant in my hand and wanted a easy way to toggle events with it," Varian explains. "There was usual assortment of hodged-together NFC readers with Arduinos/RPis dangling off them, but no fully enclosed working solution."

That's where the NFC-WiFi comes in. Measuring 46x47x20mm (around 1.8x1.85x0.8"), the fully-enclosed unit couples a PN532 NFC module with the Wemos D1 mini board. When powered via micro-USB, the board can read an NFC tag and trigger an event via MQTT or IFTTT on a connected WiFi network. The housing, meanwhile, is made from 3D-printed PETG — though, Varian adds, the USB connection hole would need sealing for external use.

Varian has published a video demonstrating the NFC-WiFi in use, unlocking his front door and switching on his entry lights with a simple tap of his NFC-equipped hand — and, of course, reversing the process again afterwards.

The NFC-WiFi Board is available now priced at $25 from Varian's Tindie store, including the 3D-printed housing; more information is available on his website, while the source code and hardware files are available on his GitHub repository under the GNU General Public Licence 3.0.

Gareth Halfacree
Freelance journalist, technical author, hacker, tinkerer, erstwhile sysadmin. For hire: freelance@halfacree.co.uk.
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