MFRC522 RFID Read and Write Data in Specific RFID Block

September 1st, 2019 by cedcraftscodes

In this tutorial, we will learn how to read and write data to a specific RFID block using MFRC522 and Arduino. If you are storing a person’s first name and surname, then this tutorial is what you are looking for. You can also read the data stored in ID by using the MFRC522 library.

Requirements

MFRC522 RFID Module

MFRC522 Library

Arduino

Jumper Wires

Pin wiring

MFRC522 RFID Module

Pin	Wiring to Arduino Uno
SDA	Digital 10
SCK	Digital 13
MOSI	Digital 11
MISO	Digital 12
IRQ	unconnected
GND	GND
RST	Digital 9
3.3V	3.3V

Writing data to RFID Block

Modify the block number and byte buffr[] variable below. In my case, I want to write Devcraze.com (12 Characters) in block 4.

You may want to use ASCII Text to Hex converter.

Per an RFID block, it must have 16 bytes. So I appended four 0x20 (Space). (Devcraze.com____) and trim it later on.

#include <SPI.h>
#include <MFRC522.h>
#define RST_PIN         9           // Configurable, see typical pin layout above
#define SS_PIN          10          // Configurable, see typical pin layout above
MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance
MFRC522::MIFARE_Key key;
MFRC522::StatusCode status;
void setup() {
Serial.begin(9600);        // Initialize serial communications with the PC
SPI.begin();               // Init SPI bus
mfrc522.PCD_Init();        // Init MFRC522 card
Serial.println(F("Write personal data on a MIFARE PICC "));
}
void loop() {
// Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
for (byte i = 0; i < 6; i++) key.keyByte[i] = 0xFF;
// Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle.
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
}
Serial.setTimeout(20000L);
byte block = 4;
byte buffr[] = {0x44,0x65,0x76,0x63,
0x72,0x61,0x7a,0x65,
0x2e,0x63,0x6f,0x6d,
0x20,0x20,0x20,0x20};
writeBytesToBlock(block, buffr);  
Serial.println(" ");
mfrc522.PICC_HaltA();
mfrc522.PCD_StopCrypto1();
}
void writeBytesToBlock(byte block, byte buff[]) {
status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, block, &key, &(mfrc522.uid));
if (status != MFRC522::STATUS_OK) {
Serial.print(F("PCD_Authenticate() failed: "));
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}
else Serial.println(F("PCD_Authenticate() success: "));
// Write block
status = mfrc522.MIFARE_Write(block, buff, 16);
if (status != MFRC522::STATUS_OK) {
Serial.print(F("MIFARE_Write() failed: "));
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}
else Serial.println(F("MIFARE_Write() success: "));
}

#include <SPI.h>

#include <MFRC522.h>

#define RST_PIN 9 // Configurable, see typical pin layout above

#define SS_PIN 10 // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance

MFRC522::MIFARE_Key key;

MFRC522::StatusCode status;

void setup() {

Serial.begin(9600); // Initialize serial communications with the PC

SPI.begin(); // Init SPI bus

mfrc522.PCD_Init(); // Init MFRC522 card

Serial.println(F("Write personal data on a MIFARE PICC "));

}

void loop() {

// Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.

for (byte i = 0; i < 6; i++) key.keyByte[i] = 0xFF;

// Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle.

if ( ! mfrc522.PICC_IsNewCardPresent()) {

return;

}

if ( ! mfrc522.PICC_ReadCardSerial()) {

return;

}

Serial.setTimeout(20000L);

byte block = 4;

byte buffr[] = {0x44,0x65,0x76,0x63,

0x72,0x61,0x7a,0x65,

0x2e,0x63,0x6f,0x6d,

0x20,0x20,0x20,0x20};

writeBytesToBlock(block, buffr);

Serial.println(" ");

mfrc522.PICC_HaltA();

mfrc522.PCD_StopCrypto1();

}

void writeBytesToBlock(byte block, byte buff[]) {

status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, block, &key, &(mfrc522.uid));

if (status != MFRC522::STATUS_OK) {

Serial.print(F("PCD_Authenticate() failed: "));

Serial.println(mfrc522.GetStatusCodeName(status));

return;

}

else Serial.println(F("PCD_Authenticate() success: "));

// Write block

status = mfrc522.MIFARE_Write(block, buff, 16);

if (status != MFRC522::STATUS_OK) {

Serial.print(F("MIFARE_Write() failed: "));

Serial.println(mfrc522.GetStatusCodeName(status));

return;

}

else Serial.println(F("MIFARE_Write() success: "));

}

Reading Data from Specific block of RFID Tag

Upload the following Arduino code to read the data stored in block 4.

#include <SPI.h>
#include <MFRC522.h>
#define RST_PIN         9           // Configurable, see typical pin layout above
#define SS_PIN          10          // Configurable, see typical pin layout above
MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance
MFRC522::MIFARE_Key key;
MFRC522::StatusCode status;
//*****************************************************************************************//
void setup() {
Serial.begin(9600);                                           // Initialize serial communications with the PC
SPI.begin();                                                  // Init SPI bus
mfrc522.PCD_Init();                                              // Init MFRC522 card
Serial.println(F("Read personal data on a MIFARE PICC:"));    //shows in serial that it is ready to read
}
//*****************************************************************************************//
void loop() {
// Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.
for (byte i = 0; i < 6; i++) key.keyByte[i] = 0xFF;
byte block;
byte len;
//-------------------------------------------
// Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle.
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;
}
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;
}
Serial.println(F("**Card Detected:**"));
byte buffer1[18];
block = 4;
len = 18;
status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, 4, &key, &(mfrc522.uid));
if (status != MFRC522::STATUS_OK) {
Serial.print(F("Authentication failed: "));
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}
status = mfrc522.MIFARE_Read(block, buffer1, &len);
if (status != MFRC522::STATUS_OK) {
Serial.print(F("Reading failed: "));
Serial.println(mfrc522.GetStatusCodeName(status));
return;
}
String value = "";
for (uint8_t i = 0; i < 16; i++)
{
value += (char)buffer1[i];
}
value.trim();
Serial.print(value);
Serial.println(F("\n**End Reading**\n"));
delay(1000);
mfrc522.PICC_HaltA();
mfrc522.PCD_StopCrypto1();
}

#include <SPI.h>

#include <MFRC522.h>

#define RST_PIN 9 // Configurable, see typical pin layout above

#define SS_PIN 10 // Configurable, see typical pin layout above

MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance

MFRC522::MIFARE_Key key;

MFRC522::StatusCode status;

//*****************************************************************************************//

void setup() {

Serial.begin(9600); // Initialize serial communications with the PC

SPI.begin(); // Init SPI bus

mfrc522.PCD_Init(); // Init MFRC522 card

Serial.println(F("Read personal data on a MIFARE PICC:")); //shows in serial that it is ready to read

}

//*****************************************************************************************//

void loop() {

// Prepare key - all keys are set to FFFFFFFFFFFFh at chip delivery from the factory.

for (byte i = 0; i < 6; i++) key.keyByte[i] = 0xFF;

byte block;

byte len;

//-------------------------------------------

// Reset the loop if no new card present on the sensor/reader. This saves the entire process when idle.

if ( ! mfrc522.PICC_IsNewCardPresent()) {

return;

}

// Select one of the cards

if ( ! mfrc522.PICC_ReadCardSerial()) {

return;

}

Serial.println(F("**Card Detected:**"));

byte buffer1[18];

block = 4;

len = 18;

status = mfrc522.PCD_Authenticate(MFRC522::PICC_CMD_MF_AUTH_KEY_A, 4, &key, &(mfrc522.uid));

if (status != MFRC522::STATUS_OK) {

Serial.print(F("Authentication failed: "));

Serial.println(mfrc522.GetStatusCodeName(status));

return;

}

status = mfrc522.MIFARE_Read(block, buffer1, &len);

if (status != MFRC522::STATUS_OK) {

Serial.print(F("Reading failed: "));

Serial.println(mfrc522.GetStatusCodeName(status));

return;

}

String value = "";

for (uint8_t i = 0; i < 16; i++)

{

value += (char)buffer1[i];

}

value.trim();

Serial.print(value);

Serial.println(F("\n**End Reading**\n"));

delay(1000);

mfrc522.PICC_HaltA();

mfrc522.PCD_StopCrypto1();

}

Open up your serial monitor and put your RFID tag near the MFRC522 RFID Module.

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