Recent iPhones will read a subset of these tag types in the background (i.e. And a key thing to know if you’re using small tags is that the NFC reader is at the top of the back of your phone near the camera, and this needs to be within about a centimetre of the tag. Another good and completely free one is NFC TagWriter by NXP, but for the particular issue of reading things with an iPhone, I had more luck with Simply NFC. If you want to experiment with this, then the Simply NFC app is a good place to start. So if you want a tag to take you to a web page, for example, without your phone needing to know anything about the tag in advance, this is a good way to do it. There are standard ways of storing URLs, phone numbers, etc, much as you would with a QR code. NFC tags each have a fixed unique ID, and for simple interactions you can just arrange that your phone does something when a particular ID is scanned.īut they can also be programmed with custom data using a protocol/format known as NDEF. You can also arrange that they do different things depending on who’s scanning them, so, for example, you could stick one beside your garage door when you scan it, it unlocks your car, when your spouse scans it, it unlocks theirs, and when anyone else scans it, it does nothing (or perhaps causes your security camera to take a photo of them!) Some tips The NFC tag is an inch in diameter.īut if you don’t mind pulling out your phone, NFC tags have some key advantages: they’re small, weatherproof, require no battery and can do more things. ![]() “Alexa, it’s movie time!”Ī Xiaomi Zigbee button on the left one of my NFC tags on the right. I don’t want to have to pull out a phone to do this it’s much easier to turn it on and off with a button, or to use voice. When movie mode is switched off, everything reverts to its previous state. When movie mode is switched on, the lights in the hall, kitchen and sitting room dim to a low warm glow, any lights that reflect in the TV screen turn off completely, the temperature in the room is raised by a degree or two, and the TV & DVD player switch on. ![]() I do alread have various Zigbee buttons around the house, and in general these are more convenient, since you can just press them without needing a phone in your hand! There are a couple in the sitting room, for example, which toggle our ‘movie mode’. ![]() Now that I have a shiny new iPhone, I’ve realised that I can finally start playing with NFC tags, and, in particular, they can do interesting things around the house by making them trigger actions in my Home Assistant system.
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