I bought some of these tiny RFID tags from Adafruit and have been trying to get them to work with an RC522 module, using this library. So far, no luck. I am using the example sketch "DumpInfo" and have gotten it to work with the card and key fob thing that came with the reader, but the tags give me nothing, even with it physically touching the reader. The actual reader I purchased can be found here.
Any guidance? Or does anyone have recommendations for a small, ideally somewhat flexible rfid tag and reader that would work at a range of an inch, inch and a half?