hello. my mrfc522 is not reading anymore.it works last day but now..it isnt working.im using arduino uno and the computer still detects its presence in arduino but when i try to read a rfid tag..it doesnt work.
what should i do ? should i buy a new one again ? how can it be broken ?
Well, clearly without your setup in front of us and the ability to test individual parts and check the connections, we are not in a position to assist.
Firstly, you have to explain such meaningless terms as "the computer still detects its presence in arduino". Are you saying the PC detects that the MFRC522 is present? How does it do this?
How do you have the MFRC522 connected? What did you use for level conversion? How have you assembled it - breadboard, soldered? How many tags have you tried, and with what software?