4 ms·
Stick QR codes to everything? Or QR codes only visible in IR, so as to be less annoying?
by tectonic 15y ago
Stick QR codes to everything? Or QR codes only visible in IR, so as to be less annoying?
- wladimir 15y agoIf it's not necessary to be human visable/readble, you could also embed RFID tags in walls / the street.