RFID.MFRC522/examples/rfid_write_personal_data/rfid_write_personal_data.ino

/*
 * Write personal data of a MIFARE RFID card using a RFID-RC522 reader
 * Uses MFRC522 - Library to use ARDUINO RFID MODULE KIT 13.56 MHZ WITH TAGS SPI W AND R BY COOQROBOT. 
 ----------------------------------------------------------------------------- 
 * Pin layout should be as follows:
 * Signal     Pin              Pin               Pin
 *            Arduino Uno      Arduino Mega      MFRC522 board
 * ------------------------------------------------------------
 * Reset      9                5                 RST
 * SPI SS     10               53                SDA
 * SPI MOSI   11               52                MOSI
 * SPI MISO   12               51                MISO
 * SPI SCK    13               50                SCK
 *
 * Hardware required:
 * Arduino
 * PCD (Proximity Coupling Device): NXP MFRC522 Contactless Reader IC
 * PICC (Proximity Integrated Circuit Card): A card or tag using the ISO 14443A interface, eg Mifare or NTAG203.
 * The reader can be found on eBay for around 5 dollars. Search for "mf-rc522" on ebay.com. 
 */

#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN 10    //Arduino Uno
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);        // Create MFRC522 instance.

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.
        MFRC522::MIFARE_Key key;
        for (byte i = 0; i < 6; i++) key.keyByte[i] = 0xFF;
        
        // Look for new cards
        if ( ! mfrc522.PICC_IsNewCardPresent()) {
                return;
        }

        // Select one of the cards
        if ( ! mfrc522.PICC_ReadCardSerial())    return;
        
        Serial.print(F("Card UID:"));    //Dump UID
        for (byte i = 0; i < mfrc522.uid.size; i++) {
          Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");
          Serial.print(mfrc522.uid.uidByte[i], HEX);
        } 
        Serial.print(F(" PICC type: "));   // Dump PICC type
        byte piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
        Serial.println(mfrc522.PICC_GetTypeName(piccType));
         
        byte buffer[34];  
        byte block;
        byte status, len;
        
        Serial.setTimeout(20000L) ;     // wait until 20 seconds for input from serial
        // Ask personal data: Family name
        Serial.println(F("Type Family name, ending with #"));
        len=Serial.readBytesUntil('#', (char *) buffer, 30) ; // read family name from serial
        for (byte i = len; i < 30; i++) buffer[i] = '\s';     // pad with spaces
        
        block = 1;
        //Serial.println(F("Authenticating using key A..."));
        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, buffer, 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: "));

        block = 2;
        //Serial.println(F("Authenticating using key A..."));
        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;
        }
        
        // Write block
	status = mfrc522.MIFARE_Write(block, &buffer[16], 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: "));

        // Ask personal data: First name
        Serial.println(F("Type First name, ending with #"));
        len=Serial.readBytesUntil('#', (char *) buffer, 20) ; // read first name from serial
        for (byte i = len; i < 20; i++) buffer[i] = '\s';     // pad with spaces
        
        block = 4;
        //Serial.println(F("Authenticating using key A..."));
        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;
        }
        
        // Write block
	status = mfrc522.MIFARE_Write(block, buffer, 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: "));

        block = 5;
        //Serial.println(F("Authenticating using key A..."));
        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;
        }
        
        // Write block
	status = mfrc522.MIFARE_Write(block, &buffer[16], 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: "));


        Serial.println(" ");
        mfrc522.PICC_HaltA(); // Halt PICC
        mfrc522.PCD_StopCrypto1();  // Stop encryption on PCD
       
}