Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [mfrc522]

26 questions
6
votes
1 answer

RFID antenna multiplexer

I am working on a project where I need to use a single RFID reader to read tags from 4 different positions (6 cm apart). It is OK to only read one tag at a time, so I figured an RF-compliant multiplexer would be a simple solution. To simplify even…
jekedorff
  • 61
  • 4
3
votes
1 answer

Anti-collision Capabilities of MFRC522

I'm a Computer Engineering student, and my full knowledge of RFIDs is limited to the research I have conducted thus far (mainly using this site). As such, there are still some general concerns I have that I could not find direct answers to. My…
KC Ford
  • 47
  • 6
2
votes
0 answers

Can RC522 wake up host controller from deep sleep?

I am using ESP32 with RC522 (MRFC522) module with Arduino IDE. Library used is MFRC522 installed from arduino IDE too. Examples works fine. Is it even possible to use IRQ pin given in module to wake up host controller(ESP32)? I tried to search for…
dharmikP
  • 525
  • 2
  • 11
2
votes
0 answers

"MH" Markings on a MFRC522 RFID reader

I just bough 2 MFRC522 RFID reader from a different store. Both of them work well to read a standard 13.56 Mhz tags. However, one of them have "MH" marking while the other doesnt. The one with MH marking able to read UID of a e-money card in my…
duck
  • 231
  • 2
  • 15
1
vote
2 answers

Why is SPI described as output and UART as input in the MFRC522 datasheet?

I am currently trying to figure out why my NFC reader circuit with MFRC522 chip is not working and I stumbled upon this in the datasheet. In the section describing how to activate different digital interfaces, the SPI has (output) next to it, UART…
Lob Ster
  • 13
  • 2
1
vote
1 answer

MFRC522 - Impedance control with External Antenna

I am a newbie into the world of RFID. For one of my upcoming designs, I am using the chip MFRC522 and an external antenna. The antenna is W7001. As you can see in the datasheet, It is mentioned that the impedance is 50/80. Could you please tell me…
soumya panda
  • 25
  • 4
1
vote
1 answer

NTAG213 Not being picked up by the RC522 Module

I have been using the RC522 module to read and write things to the tags it came with. But when I tried to use an NTAG213 I bought for a recent project it will act as if it isn't there. I've tried a lot of different code to try to get it to recognize…
Twingemios
  • 11
  • 3
1
vote
3 answers

External Antenna connection on MFRC522

New to RFID world. I am working on a Healthcare product. One of the feature includes authentication of patients which will be done through RFID reader MFRC522. Application schematic in the datasheet explains about the matching and tuning circuits.…
Lalit
  • 29
  • 1
  • 8
1
vote
1 answer

Equivalent Series Resistance of 13.56 MHz RFID Antenna

I am designing a system that uses the MFRC522 by NXP Semiconductors and I am having a bit of difficulty designing the antenna. NXP provide an antenna design guide under the application note AN1445 although I am stuck on Page 8 as I cannot find any…
jackberriman11
  • 13
  • 2
1
vote
2 answers

How to transmit SPI signals through RS422 wire

I'm using several MFRC522 modules which communicate to an arduino with the SPI protocole. The distance between the arduino and the modules will be between 1 and 2 meters. I'm worried about the distance, I'm not sure of the quality of the SPI signal…
FrancNovation
  • 397
  • 6
  • 12
1
vote
0 answers

Servo sometimes freezes when used with another servo and MFRC522 RFID reader

I have looked, Googled and researched all over by now and I have not been able to find anyone experiencing a similar issue to mine, so I thought now would be the time to ask my own question on SE. If working properly, my circuit would do the…
jepster
  • 11
  • 1
1
vote
1 answer

RC522 board not working, red led is on

I have a RFID RC522 board that was working perfectly, until by mistake I tried to write it with a phone as if it was a RFID tag and now it stopped working, in the way that its led still turns on but it's not recognised by the code (it says firmware…
Lorenzo
  • 155
  • 6
1
vote
2 answers

Driving multiple RFID readers over SPI

I am currently trying to control at least 16 RFID readers (RC522) over SPI communication. The setup is like this: 1 mainboard PCB with 16 sockets for ribbon cable connectors 16 satellite board PCBs, each with ribbon cable connector and a header for…
anders
  • 11
  • 1
1
vote
1 answer

RFID RC522 with STM32F769I-Discovery

I'm trying to communicate with rc522 chip with the use of this code, I only modified the SPI calls to use the HAL libraries and initialized SPI with HAL libraries. Kept all other functions intact. Now the image below is what I captured with my logic…
xtrinch
  • 127
  • 1
  • 7
1
vote
1 answer

DESFIRE does not reply to REQA from MFRC522

I'm writing an stm32 driver for the NXP MFRC522 ISO14443A PCD but cannot get it to talk to DESFIRE cards. My code will correctly identify both Mifare Classic (4-byte) and NTAG203F (7-byte) PICCs and it can correctly read the contents of an NTAG203,…
William Brodie-Tyrrell
  • 2,262
  • 10
  • 14
1
2