There are plenty of bespoke smart devices out there that you can pick up for your smart home, ranging from smart switches, motion sensors, and temperature sensors. Yet, one particular “device” has seemingly slipped under the radar in the last few years: the humble NFC tag. Everyone’s phone these days has an NFC reader, and the technology is still in use across the board, from passports, ID cards, and mobile payments. But did you know you can buy a lot of NFC tags for as little as $5, write your own data to them, and use them for automating your home?