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Find out how to Write Information to RFID Card utilizing RC522 RFID Module?

On this venture, we are going to learn to write information to MIFARE 1K RFID Card utilizing RC522 RFID Reader / Author Module. That is helpful if you wish to retailer customized information on the tag like pupil data or worker particulars.


We are going to use Arduino because the host controller to interface with RC522 RFID Module and write information to RFID card. I already made a tutorial on how you can interface RC522 RFID Module with Arduino. Take a look at that tutorial earlier than continuing additional as there are some fundamentals associated to RFID Communication, MFRC522 IC, RC522 RFID Module and extra.

A Temporary Have a look at Reminiscence Map of MIFARE 1K Tag

In case you add the ‘DumpInfo’ instance and open the serial monitor, Arduino will print all of the contents of the MIFARE 1K RFID Tag on the serial monitor after scanning it correctly.

It is vitally essential to grasp the reminiscence structure of the RFID Tag as we are going to know what’s the significance of every reminiscence location, what reminiscence places are reserved and what places are free to make use of for storing person information.

The next picture is a display shot of the serial monitor output of ‘DumpInfo’ instance. Allow us to now analyze this.


Analyzing Serial Monitor Output

The primary line reveals the firmware model of the MFRC522 IC. On this case, the result’s 0x92. Right here, ‘9’ stands for MFRC522 IC and ‘2’ stands for software program model 2.0. After scanning the RFID Card, we get the UID, SAK and Kind of RFID tag.

On this case, the UID is ‘6C 08 88 17’, SAK is ‘08’ and the kind of card is MIFARE 1K.


Subsequent, you possibly can see the precise reminiscence dump of the MIFARE 1K Tag. A typical MIFARE 1K RFID tag has 1K Byte of reminiscence organized into 16 Sectors (Sector 0 to Sector 15). Every Sector consists of 4 Blocks.

Understanding reminiscence Map of MIFARE 1K Tag

For instance, Sector 0 has Blocks 0, 1, 2 and three. Sector 1 has Blocks 4, 5, 6 and seven and so forth and at last Sector 15 has Blocks 60, 61, 62 and 63. Every Block can retailer 16 Bytes of knowledge.

NOTE: This numbering is simply to grasp the reminiscence structure.

So, 16 Sectors * 4 Blocks * 16 Bytes = 1024 Bytes = 1K


Block 0 of Sector 0 is reserved for storing Producer Information. Normally, this Block accommodates 4 Byte UID (Distinctive ID) in case of MIFARE 1K Tags (and in addition MIFARE 4K, MIFARE Mini tags from NXP). Superior Tags like MIFARE Plus, MIFARE Ultralight, MIFARE DESFire consists of a 7 Byte UID.


Every Sector consists of three Information Blocks, which can be utilized for storing person information. The final Block of every Sector i.e., Block 3 in case of Sector 0, Block 7 in case of Sector 1 and so forth is called Sector Trailer.

As there are 16 Sectors, there are 16 Sector Trailers. Every Sector Trailer consists of the next data:

  • A compulsory 6 Byte Key A.
  • 4 Bytes for Entry Bits.
  • Non-compulsory 6 Byte Key B (if not used, information could be saved).


NOTE: Byte 9 within the ‘Entry Bits’ area is accessible for person information.

NOTE: All sectors have three information blocks and one sector trailer besides sector 0. It has one block (Block 0) reserved for Producer Information. So, Sector 0 has two information blocks and one sector trailer.


The Entry Bits within the Sector Trailer decide the entry circumstances for all of the blocks of a Sector. 3-bits are wanted for specifying entry circumstances for the three information blocks and the sector trailer. The entry situation contains Learn, Write, Increment, Decrement, Switch and Restore.


With all this data, we are able to conclude that, you possibly can retailer 47 Bytes of Information in a MIFARE 1K RFID Information. Allow us to now see how you can Write Information to RFID Tag utilizing Arduino and RC522 RFID Module.

Interfacing RC522 with Arduino

Regardless that MFRC522 IC helps three forms of Serial Communication; UART, SPI and I2C, the SPI Interface is the quickest and commonest. The next picture reveals the pinout of RC522 RFID Module.


For dependable communication between Arduino and RC522, allow us to use the {Hardware} SPI Pins. The next desk reveals the connections between Arduino and RC522 Module.

RC522 RFID Module

Arduino UNO













Parts Required

  • Arduino UNO
  • RC522 RFID Reader / Author Module
  • Connecting Wires

Circuit Diagram

The next picture reveals the connections between Arduino and RC522 RFID Module.


Write Information to RFID Card

I wrote a easy program through which I write information to 1 Block (Block 2) and fill it utterly. This implies, the size of the information must be 16 Bytes.


The Arduino code for writing information in to MIFARE 1K RFID Tag is given beneath. I commented the code so that you could perceive it simply.




A easy demonstration on how you can Write Information to RFID card utilizing RC522 RFID Reader / Write Module and Arduino UNO. You discovered the reminiscence structure of MIFARE Basic 1K RFID Tags, reminiscence places possible to write down information and in addition write some random textual content to an RFID Card.

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