Dear Fellow Engineers,
I have just recieved two RC522 modules from eBay, both of them came with a card and a tag. Both of them read the cards just fine with miguelbalboa's library (https://github.com/miguelbalboa/rfid). But it does nothing when I am trying to use the tags. I have also tryied using the sainsmart library: cards ok, tags no joy.
What could possibly cause this issue?
I am working with an Arduino MEGA.