Joe Desbonnet combined an Arduino microcontroller with a magnetic coil to create what he calls the “Poor Man’s NFC”.

Lantronix is shipping its xPico Arduino Wi-Fi shield which supports a simultaneous wireless LAN interface and access point, and can be used to connect to an Arduino computer using web-based tools and ...

Arduino relay shields are abundant, along with real-time clocks, and now, built-in WiFi. The tough part will be coming up with apps and web interfacing, but that's not totally necessary either.

Arduino Uno R4 WiFi comes with built-in Wi-Fi and Bluetooth capabilities, along with additional pins and a new, faster processor.