topic mfrc522 in TapLinx SDK, TagWriter and TagInfo

mfrc522

wael_fakher — Tue, 17 Jun 2025 07:53:49 GMT

I designed a PCB that integrates an ESP32 and an MFRC522 RFID module. However, the ESP32 was initially unable to communicate with the MFRC522 until I reduced the SPI communication speed to 200 kHz. Even then, the reader was still unable to detect RFID tags.

Additionally, I need the MFRC522 to support three external antennas via IPEX connectors.

I would appreciate guidance on improving my design to ensure stable communication between the ESP32 and MFRC522, and to properly support external antennas.

please see my pcb design

Re: mfrc522

KaiLi — Tue, 17 Jun 2025 12:04:09 GMT

Hello @wael_fakher

It is recommended that you use a logic analyzer to check whether the SPI communication between ESP32 and MFRC522 is correct or not.

Re: mfrc522

wael_fakher — Tue, 17 Jun 2025 13:23:15 GMT

and what about the antenna ?
is it possible to have 3 ipex in parallel ?

Re: mfrc522

KaiLi — Thu, 26 Jun 2025 06:51:14 GMT

Hello @wael_fakher

You mentioned that "I need the MFRC522 to support three external antennas via IPEX connectors." From the schematic you provided, I did not see this part design. In your design, there is an MFRC522 and a PN5321. Why has two readers? what are they using for?