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Questions tagged [mfrc522]

The tag has no usage guidance.

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25 views

RFID UID vs “card number” on cheap chinese cloner

I built an RFID reader using the RC522 with an arduino. It is working great and when I scan the card that came with it it tells me the following: - Card UID: C1 44 53 63 Card SAK: 08 PICCtype: ...
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1answer
54 views

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 ...
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1answer
88 views

Working principle of RC522 [closed]

How does the antenna filtering stage work?
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0answers
72 views

“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 ...
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1answer
398 views

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 ...
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0answers
82 views

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. ...
1
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1answer
75 views

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 ...
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0answers
192 views

STM32F4 SPI interface MFRC522 Overrun problem

I have a problem regarding SPI communication between MF RC522 RFID reader and STM32F4 Discovery board. I'm hoping some of you have much more experience regarding this topic. So, basically I want to ...
3
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1answer
185 views

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 ...
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0answers
50 views

Ambiguous behavior while using 2 SPI's with relatively similar speeds STM32f030c8

I'm using RFID reader Rc522 communicating with the STM32f030c8 via SPI1 and EEPROM communicating via SPI2. System clock : 48 Mhz (via the Internal PLL system) APB peripheral clock which has the SPI's :...
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1answer
814 views

Problem using RFID RC522 with Arduino. Please help, Urgent need

I am using an RFID RC522 with Arduino but, Arduino is not detecting the RFID connected to it, its showing error. so for this, i ordered a new RFID reader and still, the problem remains the same, I ...
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2answers
322 views

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, ...
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1answer
388 views

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 ...
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1answer
639 views

RFID IC (MFRC522) with 50-Ohm antenna (taoglas fxr.01.A)

I am trying to make the MFRC522 (https://www.nxp.com/documents/data_sheet/MFRC522.pdf) to work with a taoglas 50-Ohm antenna (http://taoglas.com/images/product_images/original_images/FXR.01.07.0100C.A....
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1answer
2k views

Arduino RFID-RC522 can't read all rfid cards

I just got my RFID-RC522 reader & writer. It came with a blank white RFID card and a tag. Both of them prints out the data. But when i try my other cards at home that are also RFID cards then they ...
0
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1answer
530 views

MFRC522 RFID writing personal data

i'm searching for a specific answer about the writing personal data to RFID TAG (mifare 1k). But i could not find anything. Does the chip perforfing a "read back" verification after writing a block? ...
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1answer
346 views

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 ...