AnsweredAssumed Answered

MFRC522 doesn't detect Mifare classic cards

Question asked by André Venzon on May 10, 2018
Latest reply on May 21, 2018 by jimmychan

We developed an RFID module based on the Mifare RC522 (Mifare RFID Reader/Writer 13.56MHz RC522 SPI [3901] : Sunrom Electronics/Technologies). The schematic of the circuit is shown below. We have taken some measures and we can highlight those carried out in points 1, 2 and 3.  We noticed that the signal was attenuated. So I would like to know if this could have happened due to a possible difference in the MFRC522 registers or due to the physical characteristics of the antenna design (our antenna is a bit bigger, which can generate a difference in antenna impedances).

 

 

..............................................................................................1..............................................................................................

Mifare RC522 and Our project, same signal

...............................................................................................................................................................................................

 

.............................................................................................2..............................................................................................

                                                Mifare RC522                                                            Our project

...............................................................................................................................................................................................

 

..............................................................................................3...............................................................................................

                                          Mifare RC522                                                                  Our project

...............................................................................................................................................................................................

 

Outcomes