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How to Store and Read Data on RFID Tags Using Smart Cards Kit (NFC/RFID 13.56MHz)

Difficulty Level: Intermediate -

1. Introduction

This tutorial allows the user to store the measure taken from the LDR in the RFID cards. When 8 measures has been taken, the RFID module will read them and they will be shown on the Serial monintor.

Ingredients:

    - 1 x Smart Cards Kit (NFC/RFID 13.56MHz):
    • 1x Platform
    • 1x NFC/RFID 13.56MHz
    • 1x LDR
    • 1x 220Ω resistor
    • 1x Breadboard
    • 1x External power supply
    • 1x Programming cable
    • Jumper Wires

Preparation Time: 30 minutes

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NOTE: Depending on the platform chosen to develop the project, the ingredients and the schematics shown in this tutorial can vary.

This project can be developed with Arduino or Intel Galileo. It is also compatible with Raspberry Pi using the Raspberry Pi to Arduino shields connection bridge.

For further information about the RFID 13.56MHz Shield, consult the main tutorial.

Step 1: Connection

Connect the RFID module with its antenna to the Xbee Shield and then, connect the shield to the Arduino. Connect the LDR with the resistor in the breadboard as you can see in the next diagram.

Connect two wires, red and black, to the two long rows on the side of the breadboard to provide access to the 5 volt supply and ground. Connect the LDR to GND and the other LDR leg to a resistor, connect also this point to Analog 0 in the Xbee Shield. The other resistor leg has to be connected to 5 volt.

WARNING: In Raspberry Pi, GPIO voltage levels are 3.3 V and are not 5 V tolerant. There is no over-voltage protection on the board. Digital inputs use a 3V3 logic level and are not tolerant of 5V levels, such as you might find on a 5V powered Arduino. Extreme caution when working with GPIO, you may damage your Raspberry Pi, your equipment and potentially yourself and others. Doing so is at your own risk!

Step 2: The Code

Arduino:

Code:
/*  
 *  RFID 13.56 MHz / NFC Module
 *  
 *  Copyright (C) Libelium Comunicaciones Distribuidas S.L. 
 *  http://www.libelium.com 
 *  
 *  This program is free software: you can redistribute it and/or modify 
 *  it under the terms of the GNU General Public License as published by 
 *  the Free Software Foundation, either version 3 of the License, or 
 *  (at your option) any later version. 
 *  
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License 
 *  along with this program.  If not, see http://www.gnu.org/licenses/. 
 *  
 *  Version:           1.0
 *  Design:            David GascĂłn 
 *  Implementation:    Luis Miguel MartĂ­
 */

uint8_t dataRX[35];//Receive buffer.
uint8_t dataTX[35];//Transmit buffer.
//stores the status of the executed command:
short state;
//auxiliar buffer:
unsigned char aux[16];
//stores the UID (unique identifier) of a card:
unsigned char _CardID[4];
//stores the key or password:
unsigned char keyOld[]= {
  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};// Old key access
uint8_t meassures[16];
byte counter;
boolean stored = true;
//only edit config if strong knowledge about the RFID/NFC module
unsigned char config[] = {
  0xFF, 0x07, 0x80, 0x69};
uint8_t key_address = 7;
uint8_t write_address = 4;

void setup()
{
  // start serial port 115200 bps:
  Serial.begin(115200);
  Serial.print("RFID/NFC @ 13.56 MHz module started");
  delay(1000);
  //! It is needed to launch a simple command to sycnchronize
  getFirmware();
  configureSAM();
  delay(1000); 
  Serial.println("Welcome");
  Serial.println("Ready to save data");
  Serial.flush();
  counter = 0;
  pinMode(10,OUTPUT);
  pinMode(11,OUTPUT);
  pinMode(12,OUTPUT);
}

void loop()
{
  //take 8 lecture from sensor and write them into the tag card
  while(counter<8){

    Serial.print("\n");
    Serial.println("Ready to write...");
    /////////////////////////////////////////////////////////////
    //Get the UID Identifier

    init(_CardID, aux);
    /////////////////////////////////////////////////////////////
    //Auntenticate a block with his keyAccess
    state = authenticate(_CardID, write_address, keyOld);
    if ( state == 0) {
      Serial.print("\n");
      Serial.print( "The UID : ");
      print(_CardID , 4);
      Serial.print("\n");
      Serial.println("Authentication block OK");
    } 
    else {
      Serial.println("Authentication failed");
    }
    /////////////////////////////////////////////////////////////
    //Write blockData in a address, after authentication.
    if ( state == 0 ) {
      //saves sensor meassurement into its corresponding bytes
      meassures[counter] = analogRead(A0)>>2;
      //saves time when meassurement was taken
      meassures[counter+8] = millis()/1000;
      state = writeData(write_address, meassures);
      Serial.print("\n");
      if ( state == 0) {
        Serial.println("Write block OK");
        counter++;
        Serial.print("\n");
        Serial.print("Data written : ");
        Serial.print(meassures[counter],DEC);
        Serial.print(" ");
        Serial.print(meassures[counter+7],DEC);
        Serial.print("\n");
      } 
      else {
        Serial.println("Write failed, no data stored");
      }


      delay(1000);
    }
  }
  //wait for card to be waved again and read the whole data stored before
  while (stored){
    Serial.print("\n");
    Serial.println("Ready to read...");
    /////////////////////////////////////////////////////////////
    //Get the UID Identifier
    init(_CardID, aux);
    Serial.print("\n");
    Serial.print( "The UID : ");
    print(_CardID , 4);
    /////////////////////////////////////////////////////////////
    //Auntenticate a block with his keyAccess
    state = authenticate(_CardID, write_address, keyOld);
    Serial.print("\n");

    if ( state == 0) {
      Serial.println("Authentication block OK");
    } 
    else {
      Serial.println("Authentication failed");
    }
    /////////////////////////////////////////////////////////////
    //Read from address after authentication
    state = readData(write_address, aux);
    Serial.print("\n");

    if (state == 0) {
      Serial.println("Read block OK");
      stored = false;
    } 
    else {
      Serial.println("Read failed");
    }

    Serial.print("\n");
    Serial.print("Data read: ");
    for (byte i = 0; i<8; i++){

      Serial.print(aux[i], DEC);
      Serial.print(" ");
      Serial.print(aux[i+8], DEC);
      Serial.print("  ");
    }
    Serial.print("\n");
    delay(1000);
  }
}

//**********************************************************************
//!The goal of this command is to detect as many targets (maximum MaxTg)
//  as possible in passive mode.
uint8_t init(uint8_t *CardID , uint8_t *ATQ)   //! Request InListPassive
{
  Serial.flush();

  dataTX[0] = 0x04; // Length
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4;
  dataTX[3] = 0x4A; // Code
  dataTX[4] = 0x01; //MaxTarget
  dataTX[5] = 0x00; //BaudRate = 106Kbps
  dataTX[6] = 0x00; // Clear checkSum position
  checkSum(dataTX); 

  sendTX(dataTX , 7 ,23);	

  for (int i = 17; i < (21) ; i++){
    _CardID[i-17] = dataRX[i];
    CardID[i-17] = _CardID[i-17];
  }

  ATQ[0] = dataRX[13];
  ATQ[1] = dataRX[14];

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x4B) & (dataRX[11] == 0x01)) {
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!A block must be authenticated before read and write operations
uint8_t authenticate(uint8_t *CardID, uint8_t blockAddress, uint8_t *keyAccess)
{
  dataTX[0] = 0x0F;
  lengthCheckSum(dataTX);
  dataTX[2] = 0xD4;
  dataTX[3] = 0x40; // inDataEchange
  dataTX[4] = 0x01; //Number of targets
  dataTX[5] = 0x60; // Authentication code
  dataTX[6] = blockAddress;
  for (int i = 0; i < 6 ; i++) {
    dataTX[i + 7] = keyAccess[i];
  }
  dataTX[13] = CardID[0];  
  dataTX[14] = CardID[1];
  dataTX[15] = CardID[2];  
  dataTX[16] = CardID[3];
  dataTX[17] = 0x00;
  checkSum(dataTX);
  sendTX(dataTX , 18 ,14);

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x41) & (dataRX[11] == 0x00)) {
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!Write 16 bytes in address .
uint8_t writeData(uint8_t address, uint8_t *blockData)  //!Writing
{
  Serial.print("                ");
  dataTX[0] = 0x15;
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4;
  dataTX[3] = 0x40;  //inDataEchange CODE
  dataTX[4] = 0x01;  //Number of targets
  dataTX[5] = 0xA0; //Write Command
  dataTX[6] = address; //Address		

    for (int i = 0; i < 16; i++) {
    dataTX[i+7] = blockData[i];
  }

  dataTX[23] = 0x00;
  checkSum(dataTX);
  sendTX(dataTX , 24 ,14);  		

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x41) & (dataRX[11] == 0x00)) {
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!Read 16 bytes from  address .
uint8_t readData(uint8_t address, uint8_t *readData) //!Reading
{
  Serial.print("                ");		

  dataTX[0] = 0x05;
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4; // Code
  dataTX[3] = 0x40; // Code
  dataTX[4] = 0x01; // Number of targets
  dataTX[5] = 0x30; //ReadCode
  dataTX[6] = address;  //Read address
  dataTX[7] = 0x00;
  checkSum(dataTX);
  sendTX(dataTX , 8, 30);
  memset(readData, 0x00, 16);  

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x41) & (dataRX[11] == 0x00)) {
    for (int i = 12; i < 28; i++) {
      readData[i-12] = dataRX[i];
    }
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!The PN532 sends back the version of the embedded firmware.
bool getFirmware(void)  //! It is needed to launch a simple command to sycnchronize
{
  Serial.print("                ");		

  memset(dataTX, 0x00, 35);
  dataTX[0] = 0x02; // Length
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4; // CODE
  dataTX[3] = 0x02; //TFI
  checkSum(dataTX); //0x2A; //Checksum   

  sendTX(dataTX , 5 , 17);
  Serial.print("\n");
  Serial.print("Your Firmware version is : ");

  for (int i = 11; i < (15) ; i++){
    Serial.print(dataRX[i], HEX);
    Serial.print(" ");
  }
  Serial.print("\n");
}

//**********************************************************************
//!Print data stored in vectors .
void print(uint8_t * _data, uint8_t length)
{
  for (int i = 0; i < length ; i++){
    Serial.print(_data[i], HEX);
    Serial.print(" ");
  }
  Serial.print("\n");
}
//**********************************************************************
//!This command is used to set internal parameters of the PN532,
bool configureSAM(void)//! Configure the SAM
{
  Serial.print("               ");

  dataTX[0] = 0x05; //Length
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4;
  dataTX[3] = 0x14;
  dataTX[4] = 0x01; //Normal mode
  dataTX[5] = 0x14; // TimeOUT
  dataTX[6] = 0x00; // IRQ
  dataTX[7] = 0x00; // Clean checkSum position
  checkSum(dataTX);

  sendTX(dataTX , 8, 13);
}
//**********************************************************************
//!Send data stored in dataTX
void sendTX(uint8_t *dataTX, uint8_t length, uint8_t outLength)
{
  Serial.print(char(0x00));
  Serial.print(char(0x00));
  Serial.print(char(0xFF)); 

  for (int i = 0; i < length; i++) {
    Serial.print(char(dataTX[i]));
  }

  Serial.print(char(0x00));
  getACK();
  waitResponse();    // 1C - receive response
  getData(outLength);
}
//**********************************************************************
//!Wait for ACK response and stores it in the dataRX buffer
void getACK(void)
{
  delay(5);
  waitResponse();
  for (int i = 0; i < 5 ; i++) {
    dataRX[i] = Serial.read();
  }
}
//**********************************************************************
//!Wait the response of the module
void waitResponse(void)
{
  int val = 0xFF;
  int cont = 0x00;
  while(val != 0x00) { //Wait for 0x00 response
    val = Serial.read();
    delay(5);
    cont ++;
  }
}
//**********************************************************************
//!Get data from the module
void getData(uint8_t outLength)
{
  for (int i=5; i < outLength; i++) {
    dataRX[i] = Serial.read(); // read data from the module.
  }
}
//**********************************************************************
//!Calculates the checksum and stores it in dataTX buffer
void checkSum(uint8_t *dataTX)
{
  for (int i = 0; i < dataTX[0] ; i++) {
    dataTX[dataTX[0] + 2] += dataTX[i + 2];
  }
  byte(dataTX[dataTX[0] + 2]= - dataTX[dataTX[0] + 2]);
}
//**********************************************************************
//!Calculates the length checksum and sotres it in the buffer.
uint8_t lengthCheckSum(uint8_t *dataTX)
{
  dataTX[1] = byte(0x100 - dataTX[0]);
}
//**********************************************************************
//Prints via serial data read from the TAG in block "read_adress"
void printData()
{
  Serial.print("\n");
  Serial.println("Ready to read...");
  /////////////////////////////////////////////////////////////
  //Get the UID Identifier
  init(_CardID, aux);
  Serial.print("\n");
  Serial.print( "The UID : ");
  print(_CardID , 4);
  /////////////////////////////////////////////////////////////
  //Auntenticate a block with his keyAccess
  state = authenticate(_CardID, write_address, keyOld);
  Serial.print("\n");

  if ( state == 0) {
    Serial.println("Authentication block OK");
  } 
  else {
    Serial.println("Authentication failed");
  }
  /////////////////////////////////////////////////////////////
  //Read from address after authentication
  state = readData(write_address, aux);
  Serial.print("\n");

  if (state == 0) {
    Serial.println("Read block OK");
  } 
  else {
    Serial.println("Read failed");
  }

  Serial.print("\n");
  Serial.print("Data read: ");
  print(aux , 16);
  Serial.print("\n");
}


        

Raspberry Pi:

Code:
/*  
 *  RFID 13.56 MHz / NFC Module
 *  
 *  Copyright (C) Libelium Comunicaciones Distribuidas S.L. 
 *  http://www.libelium.com 
 *  
 *  This program is free software: you can redistribute it and/or modify 
 *  it under the terms of the GNU General Public License as published by 
 *  the Free Software Foundation, either version 3 of the License, or 
 *  (at your option) any later version. 
 *  
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License 
 *  along with this program.  If not, see http://www.gnu.org/licenses/. 
 *  
 *  Version:           1.0
 *  Design:            David GascĂłn 
 *  Implementation:    Jorge Casanova, Luis MartĂ­n
 */

#include "arduPi.h"


uint8_t dataRX[35];//Receive buffer.
uint8_t dataTX[35];//Transmit buffer.
//stores the status of the executed command:
short state;
//auxiliar buffer:
unsigned char aux[16];
//stores the UID (unique identifier) of a card:
unsigned char _CardID[4];
//stores the key or password:
unsigned char keyOld[]= {
  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};// Old key access
uint8_t meassures[16];
byte counter;
boolean stored = true;
//only edit config if strong knowledge about the RFID/NFC module
unsigned char config[] = {
  0xFF, 0x07, 0x80, 0x69};
uint8_t key_address = 7;
uint8_t write_address = 4;

uint8_t init(uint8_t *CardID , uint8_t *ATQ);
uint8_t authenticate(uint8_t *CardID, uint8_t blockAddress, uint8_t *keyAccess);
uint8_t writeData(uint8_t address, uint8_t *blockData);
uint8_t readData(uint8_t address, uint8_t *readData);
bool getFirmware(void);
void print(uint8_t * _data, uint8_t length);
bool configureSAM(void);
void sendTX(uint8_t *dataTX, uint8_t length, uint8_t outLength);
void getACK(void);
void waitResponse(void);
void getData(uint8_t outLength);
void checkSum(uint8_t *dataTX);
uint8_t lengthCheckSum(uint8_t *dataTX);
void printData();

void setup()
{
  pinMode(0, INPUT);
  
  // start serial port 115200 bps:
  Serial.begin(115200);
  printf("RFID/NFC @ 13.56 MHz module started\n");
  delay(1000);
  //! It is needed to launch a simple command to sycnchronize
  getFirmware();
  configureSAM();
  delay(1000); 
  printf("Welcome\n");
  printf("Ready to save data\n");
  Serial.flush();
  counter = 0;
}

void loop()
{
  //take 8 lecture from sensor and write them into the tag card
  while(counter<8){

    printf(" \n");
    printf("Ready to write...\n");
    /////////////////////////////////////////////////////////////
    //Get the UID Identifier

    init(_CardID, aux);
    /////////////////////////////////////////////////////////////
    //Auntenticate a block with his keyAccess
    state = authenticate(_CardID, write_address, keyOld);
    if ( state == 0) {
      printf(" \n");
      printf( "The UID : \n");
      print(_CardID , 4);
      printf(" \n");
      printf("Authentication block OK\n");
    } 
    else {
      printf("Authentication failed\n");
    }
    /////////////////////////////////////////////////////////////
    //Write blockData in a address, after authentication.
    if ( state == 0 ) {
      //saves sensor meassurement into its corresponding bytes
      meassures[counter] = analogRead(0)>>2;
      int a=meassures [counter];
      //saves time when meassurement was taken
      meassures[counter+8] = millis()/1000;
      state = writeData(write_address, meassures);
      printf(" \n");
      if ( state == 0) {
        printf("Write block OK\n");
        counter++;
        printf(" \n");
        printf("Data written : \n");
        printf("%i \n", a);
        printf("%i",meassures[counter+7]);
        printf(" \n");
      } 
      else {
        printf("Write failed, no data stored\n");
      }

      delay(1000);
    }
  }
  //wait for card to be waved again and read the whole data stored before
  while (stored){
    printf(" \n");
    printf("Ready to read...\n");
    /////////////////////////////////////////////////////////////
    //Get the UID Identifier
    init(_CardID, aux);
    printf(" \n");
    printf( "The UID : \n");
    print(_CardID , 4);
    /////////////////////////////////////////////////////////////
    //Auntenticate a block with his keyAccess
    state = authenticate(_CardID, write_address, keyOld);
    printf(" \n");

    if ( state == 0) {
     printf("Authentication block OK\n");
     printf("Todas Lecturas \n");
    } 
    else {
      printf("Authentication failed\n");
    }
    /////////////////////////////////////////////////////////////
    //Read from address after authentication
    state = readData(write_address, aux);
    printf(" \n");

    if (state == 0) {
      printf("Read block OK\n");
      stored = false;
    } 
    else {
      printf("Read failed\n");
    }

    printf(" \n");
    printf("Data read: \n");
    for (byte i = 0; i<8; i++){

      printf("%i",aux[i]);
      printf(" ");
      printf("%i",aux[i+8]);
      printf("  ");
    }
    printf(" \n");
    delay(1000);
  }
}

//**********************************************************************
//!The goal of this command is to detect as many targets (maximum MaxTg)
//  as possible in passive mode.
uint8_t init(uint8_t *CardID , uint8_t *ATQ)   //! Request InListPassive
{
  Serial.flush();

  dataTX[0] = 0x04; // Length
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4;
  dataTX[3] = 0x4A; // Code
  dataTX[4] = 0x01; //MaxTarget
  dataTX[5] = 0x00; //BaudRate = 106Kbps
  dataTX[6] = 0x00; // Clear checkSum position
  checkSum(dataTX); 

  sendTX(dataTX , 7 ,23);	

  for (int i = 17; i < (21) ; i++){
    _CardID[i-17] = dataRX[i];
    CardID[i-17] = _CardID[i-17];
  }

  ATQ[0] = dataRX[13];
  ATQ[1] = dataRX[14];

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x4B) & (dataRX[11] == 0x01)) {
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!A block must be authenticated before read and write operations
uint8_t authenticate(uint8_t *CardID, uint8_t blockAddress, uint8_t *keyAccess)
{
  dataTX[0] = 0x0F;
  lengthCheckSum(dataTX);
  dataTX[2] = 0xD4;
  dataTX[3] = 0x40; // inDataEchange
  dataTX[4] = 0x01; //Number of targets
  dataTX[5] = 0x60; // Authentication code
  dataTX[6] = blockAddress;
  for (int i = 0; i < 6 ; i++) {
    dataTX[i + 7] = keyAccess[i];
  }
  dataTX[13] = CardID[0];  
  dataTX[14] = CardID[1];
  dataTX[15] = CardID[2];  
  dataTX[16] = CardID[3];
  dataTX[17] = 0x00;
  checkSum(dataTX);
  sendTX(dataTX , 18 ,14);

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x41) & (dataRX[11] == 0x00)) {
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!Write 16 bytes in address .
uint8_t writeData(uint8_t address, uint8_t *blockData)  //!Writing
{
  Serial.print("                ");
  dataTX[0] = 0x15;
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4;
  dataTX[3] = 0x40;  //inDataEchange CODE
  dataTX[4] = 0x01;  //Number of targets
  dataTX[5] = 0xA0; //Write Command
  dataTX[6] = address; //Address		

    for (int i = 0; i < 16; i++) {
    dataTX[i+7] = blockData[i];
  }

  dataTX[23] = 0x00;
  checkSum(dataTX);
  sendTX(dataTX , 24 ,14);  		

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x41) & (dataRX[11] == 0x00)) {
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!Read 16 bytes from  address .
uint8_t readData(uint8_t address, uint8_t *readData) //!Reading
{
  printf("                \n");		

  dataTX[0] = 0x05;
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4; // Code
  dataTX[3] = 0x40; // Code
  dataTX[4] = 0x01; // Number of targets
  dataTX[5] = 0x30; //ReadCode
  dataTX[6] = address;  //Read address
  dataTX[7] = 0x00;
  checkSum(dataTX);
  sendTX(dataTX , 8, 30);
  memset(readData, 0x00, 16);  

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x41) & (dataRX[11] == 0x00)) {
    for (int i = 12; i < 28; i++) {
      readData[i-12] = dataRX[i];
    }
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!The PN532 sends back the version of the embedded firmware.
bool getFirmware(void)  //! It is needed to launch a simple command to sycnchronize
{
  printf("                \n");		

  memset(dataTX, 0x00, 35);
  dataTX[0] = 0x02; // Length
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4; // CODE
  dataTX[3] = 0x02; //TFI
  checkSum(dataTX); //0x2A; //Checksum   

  sendTX(dataTX , 5 , 17);
  printf(" \n");
  printf("Your Firmware version is : ");

  for (int i = 11; i < (15) ; i++){
    printf("%x",dataRX[i]);
    printf(" ");
  }
  printf(" \n");
}

//**********************************************************************
//!Print data stored in vectors .
void print(uint8_t * _data, uint8_t length)
{
  for (int i = 0; i < length ; i++){
    printf("%x",_data[i]);
    printf(" ");
  }
  printf(" \n");
}
//**********************************************************************
//!This command is used to set internal parameters of the PN532,
bool configureSAM(void)//! Configure the SAM
{
  printf("               \n");

  dataTX[0] = 0x05; //Length
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4;
  dataTX[3] = 0x14;
  dataTX[4] = 0x01; //Normal mode
  dataTX[5] = 0x14; // TimeOUT
  dataTX[6] = 0x00; // IRQ
  dataTX[7] = 0x00; // Clean checkSum position
  checkSum(dataTX);

  sendTX(dataTX , 8, 13);
}
//**********************************************************************
//!Send data stored in dataTX
void sendTX(uint8_t *dataTX, uint8_t length, uint8_t outLength)
{
  Serial.print(char(0x00));
  Serial.print(char(0x00));
  Serial.print(char(0xFF)); 

  for (int i = 0; i < length; i++) {
    Serial.print(char(dataTX[i]));
  }

  Serial.print(char(0x00));
  getACK();
  waitResponse();    // 1C - receive response
  getData(outLength);
}
//**********************************************************************
//!Wait for ACK response and stores it in the dataRX buffer
void getACK(void)
{
  delay(5);
  waitResponse();
  for (int i = 0; i < 5 ; i++) {
    dataRX[i] = Serial.read();
  }
}
//**********************************************************************
//!Wait the response of the module
void waitResponse(void)
{
  int val = 0xFF;
  int cont = 0x00;
  while(val != 0x00) { //Wait for 0x00 response
    val = Serial.read();
    delay(5);
    cont ++;
  }
}
//**********************************************************************
//!Get data from the module
void getData(uint8_t outLength)
{
  for (int i=5; i < outLength; i++) {
    dataRX[i] = Serial.read(); // read data from the module.
  }
}
//**********************************************************************
//!Calculates the checksum and stores it in dataTX buffer
void checkSum(uint8_t *dataTX)
{
  for (int i = 0; i < dataTX[0] ; i++) {
    dataTX[dataTX[0] + 2] += dataTX[i + 2];
  }
  byte(dataTX[dataTX[0] + 2]= - dataTX[dataTX[0] + 2]);
}
//**********************************************************************
//!Calculates the length checksum and sotres it in the buffer.
uint8_t lengthCheckSum(uint8_t *dataTX)
{
  dataTX[1] = byte(0x100 - dataTX[0]);
}
//**********************************************************************
//Prints via serial data read from the TAG in block "read_adress"
void printData()
{
  printf(" \n");
  printf("Ready to read...\n");
  /////////////////////////////////////////////////////////////
  //Get the UID Identifier
  init(_CardID, aux);
  printf(" \n");
  printf( "The UID : ");
  print(_CardID , 4);
  /////////////////////////////////////////////////////////////
  //Auntenticate a block with his keyAccess
  state = authenticate(_CardID, write_address, keyOld);
  printf(" \n");

  if ( state == 0) {
    printf("Authentication block OK\n");
   
  } 
  else {
    printf("Authentication failed\n");
  }
  /////////////////////////////////////////////////////////////
  //Read from address after authentication
  state = readData(write_address, aux);
  printf(" \n");

  if (state == 0) {
    printf("Read block OK\n");
  } 
  else {
    printf("Read failed\n");
  }

  printf(" \n");
  printf("Data read: ");
  print(aux , 16);
  printf(" \n");

}  

  
  int main (){
	setup();
	while(1){
		loop();
	}
	return (0);
}

        

Intel Galileo:

Code:
/*  
 *  RFID 13.56 MHz / NFC Module
 *  
 *  Copyright (C) Libelium Comunicaciones Distribuidas S.L. 
 *  http://www.libelium.com 
 *  
 *  This program is free software: you can redistribute it and/or modify 
 *  it under the terms of the GNU General Public License as published by 
 *  the Free Software Foundation, either version 3 of the License, or 
 *  (at your option) any later version. 
 *  
 *  This program is distributed in the hope that it will be useful, 
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of 
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the 
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License 
 *  along with this program.  If not, see http://www.gnu.org/licenses/. 
 *  
 *  Version:           1.0
 *  Design:            David GascĂłn 
 *  Implementation:    Jorge Casanova, Luis MartĂ­n
 */

uint8_t dataRX[35];//Receive buffer.
uint8_t dataTX[35];//Transmit buffer.
//stores the status of the executed command:
short state;
//auxiliar buffer:
unsigned char aux[16];
//stores the UID (unique identifier) of a card:
unsigned char _CardID[4];
//stores the key or password:
unsigned char keyOld[]= {
  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};// Old key access
uint8_t meassures[16];
byte counter;
boolean stored = true;
//only edit config if strong knowledge about the RFID/NFC module
unsigned char config[] = {
  0xFF, 0x07, 0x80, 0x69};
uint8_t key_address = 7;
uint8_t write_address = 4;


void setup()
{
  // start serial port 115200 bps:
  Serial.begin(115200);
  Serial1.begin(115200);
  Serial.print("RFID/NFC @ 13.56 MHz module started");
  delay(1000);
  //! It is needed to launch a simple command to sycnchronize
  getFirmware();
  configureSAM();
  delay(1000); 
  Serial.println("Welcome");
  Serial.println("Ready to save data");
  Serial.flush();
  counter = 0;  
}

void loop()
{
  //take 8 lecture from sensor and write them into the tag card
  while(counter<8){

    Serial.print("\n");
    Serial.println("Ready to write...");
    /////////////////////////////////////////////////////////////
    //Get the UID Identifier

    init(_CardID, aux);
    /////////////////////////////////////////////////////////////
    //Auntenticate a block with his keyAccess
    state = authenticate(_CardID, write_address, keyOld);
    if ( state == 0) {
      Serial.print("\n");
      Serial.print( "The UID : ");
      print(_CardID , 4);
      Serial.print("\n");
      Serial.println("Authentication block OK");
    } 
    else {
      Serial.println("Authentication failed");
    }
    /////////////////////////////////////////////////////////////
    //Write blockData in a address, after authentication.
    if ( state == 0 ) {
      //saves sensor meassurement into its corresponding bytes
      meassures[counter] = analogRead(A0)>>2;
      //saves time when meassurement was taken
      int a=meassures [counter]; 
      meassures[counter+8] = millis()/1000;
      state = writeData(write_address, meassures);
      Serial1.print("\n");
      if ( state == 0) {
        Serial.println("Write block OK");
        counter++;
        Serial.print("\n");
        Serial.print("Data written : ");
        Serial.print(a,DEC);
        Serial.print(" ");
        Serial.print(meassures[counter+7],DEC);
        Serial.print("\n");
      } 
      else {
        Serial.println("Write failed, no data stored");
      }

      delay(1000);
    }
  }
  //wait for card to be waved again and read the whole data stored before
  while (stored){
    Serial.print("\n");
    Serial.println("Ready to read...");
    /////////////////////////////////////////////////////////////
    //Get the UID Identifier
    init(_CardID, aux);
    Serial.print("\n");
    Serial.print( "The UID : ");
    print(_CardID , 4);
    /////////////////////////////////////////////////////////////
    //Auntenticate a block with his keyAccess
    state = authenticate(_CardID, write_address, keyOld);
    Serial1.print("\n");

    if ( state == 0) {
      Serial.println("Authentication block OK");
    } 
    else {
      Serial.println("Authentication failed");
    }
    /////////////////////////////////////////////////////////////
    //Read from address after authentication
    state = readData(write_address, aux);
    Serial.print("\n");

    if (state == 0) {
      Serial.println("Read block OK");
      stored = false;
    } 
    else {
      Serial.println("Read failed");
    }

    Serial.print("\n");
    Serial.print("Data read: ");
    for (byte i = 0; i<8; i++){

      Serial.print(aux[i], DEC);
      Serial.print(" ");
      Serial.print(aux[i+8], DEC);
      Serial.print("  ");
    }
    Serial.print("\n");
    delay(1000);
  }
}

//**********************************************************************
//!The goal of this command is to detect as many targets (maximum MaxTg)
//  as possible in passive mode.
uint8_t init(uint8_t *CardID , uint8_t *ATQ)   //! Request InListPassive
{
  Serial1.flush();

  dataTX[0] = 0x04; // Length
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4;
  dataTX[3] = 0x4A; // Code
  dataTX[4] = 0x01; //MaxTarget
  dataTX[5] = 0x00; //BaudRate = 106Kbps
  dataTX[6] = 0x00; // Clear checkSum position
  checkSum(dataTX); 
  sendTX(dataTX , 7 ,23);	

  for (int i = 17; i < (21) ; i++){
    _CardID[i-17] = dataRX[i];
    CardID[i-17] = _CardID[i-17];
  }

  ATQ[0] = dataRX[13];
  ATQ[1] = dataRX[14];

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x4B) & (dataRX[11] == 0x01)) {
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!A block must be authenticated before read and write operations
uint8_t authenticate(uint8_t *CardID, uint8_t blockAddress, uint8_t *keyAccess)
{
  dataTX[0] = 0x0F;
  lengthCheckSum(dataTX);
  dataTX[2] = 0xD4;
  dataTX[3] = 0x40; // inDataEchange
  dataTX[4] = 0x01; //Number of targets
  dataTX[5] = 0x60; // Authentication code
  dataTX[6] = blockAddress;
  for (int i = 0; i < 6 ; i++) {
    dataTX[i + 7] = keyAccess[i];
  }
  dataTX[13] = CardID[0];  
  dataTX[14] = CardID[1];
  dataTX[15] = CardID[2];  
  dataTX[16] = CardID[3];
  dataTX[17] = 0x00;
  checkSum(dataTX);
  sendTX(dataTX , 18 ,14);

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x41) & (dataRX[11] == 0x00)) {
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!Write 16 bytes in address .
uint8_t writeData(uint8_t address, uint8_t *blockData)  //!Writing
{
  Serial1.print("                ");
  dataTX[0] = 0x15;
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4;
  dataTX[3] = 0x40;  //inDataEchange CODE
  dataTX[4] = 0x01;  //Number of targets
  dataTX[5] = 0xA0; //Write Command
  dataTX[6] = address; //Address		

    for (int i = 0; i < 16; i++) {
    dataTX[i+7] = blockData[i];
  }

  dataTX[23] = 0x00;
  checkSum(dataTX);
  sendTX(dataTX , 24 ,14);  		

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x41) & (dataRX[11] == 0x00)) {
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!Read 16 bytes from  address .
uint8_t readData(uint8_t address, uint8_t *readData) //!Reading
{
  Serial1.print("                ");		

  dataTX[0] = 0x05;
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4; // Code
  dataTX[3] = 0x40; // Code
  dataTX[4] = 0x01; // Number of targets
  dataTX[5] = 0x30; //ReadCode
  dataTX[6] = address;  //Read address
  dataTX[7] = 0x00;
  checkSum(dataTX);
  sendTX(dataTX , 8, 30);
  memset(readData, 0x00, 16);  

  if ((dataRX[9]== 0xD5) & (dataRX[10] == 0x41) & (dataRX[11] == 0x00)) {
    for (int i = 12; i < 28; i++) {
      readData[i-12] = dataRX[i];
    }
    return 0;
  } 
  else {
    return 1;
  }
}
//**********************************************************************
//!The PN532 sends back the version of the embedded firmware.
bool getFirmware(void)  //! It is needed to launch a simple command to sycnchronize
{
  Serial1.print("                ");		

  memset(dataTX, 0x00, 35);
  dataTX[0] = 0x02; // Length
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4; // CODE
  dataTX[3] = 0x02; //TFI
  checkSum(dataTX); //0x2A; //Checksum

  sendTX(dataTX , 5 , 17);
  Serial1.print("\n");
  Serial.print("Your Firmware version is : ");

  for (int i = 11; i < (15) ; i++){
    Serial1.print(dataRX[i], HEX);
    Serial1.print(" ");
  }
  Serial1.print("\n");
}

//**********************************************************************
//!Print data stored in vectors .
void print(uint8_t * _data, uint8_t length)
{
  for (int i = 0; i < length ; i++){
    Serial.print(_data[i], HEX);
    Serial.print(" ");
  }
  Serial.print("\n");
}
//**********************************************************************
//!This command is used to set internal parameters of the PN532,
bool configureSAM(void)//! Configure the SAM
{
  Serial1.print("               ");

  dataTX[0] = 0x05; //Length
  lengthCheckSum(dataTX); // Length Checksum
  dataTX[2] = 0xD4;
  dataTX[3] = 0x14;
  dataTX[4] = 0x01; //Normal mode
  dataTX[5] = 0x14; // TimeOUT
  dataTX[6] = 0x00; // IRQ
  dataTX[7] = 0x00; // Clean checkSum position
  checkSum(dataTX);

  sendTX(dataTX , 8, 13);
}
//**********************************************************************
//!Send data stored in dataTX
void sendTX(uint8_t *dataTX, uint8_t length, uint8_t outLength)
{
  Serial1.print(char(0x00));
  Serial1.print(char(0x00));
  Serial1.print(char(0xFF)); 

  for (int i = 0; i < length; i++) {
    Serial1.print(char(dataTX[i]));
  }

  Serial1.print(char(0x00));
  getACK();
  waitResponse();    // 1C - receive response
  getData(outLength);
}
//**********************************************************************
//!Wait for ACK response and stores it in the dataRX buffer
void getACK(void)
{
  delay(5);
  waitResponse();
  for (int i = 0; i < 5 ; i++) {
    dataRX[i] = Serial1.read();
  }
}
//**********************************************************************
//!Wait the response of the module
void waitResponse(void)
{
  int val = 0xFF;
  int cont = 0x00;
  while(val != 0x00) { //Wait for 0x00 response
    val = Serial1.read();
    delay(5);
    cont ++;
  }
}
//**********************************************************************
//!Get data from the module
void getData(uint8_t outLength)
{
  for (int i=5; i < outLength; i++) {
    dataRX[i] = Serial1.read(); // read data from the module.
  }
}
//**********************************************************************
//!Calculates the checksum and stores it in dataTX buffer
void checkSum(uint8_t *dataTX)
{
  for (int i = 0; i < dataTX[0] ; i++) {
    dataTX[dataTX[0] + 2] += dataTX[i + 2];
  }
  byte(dataTX[dataTX[0] + 2]= - dataTX[dataTX[0] + 2]);
}
//**********************************************************************
//!Calculates the length checksum and sotres it in the buffer.
uint8_t lengthCheckSum(uint8_t *dataTX)
{
  dataTX[1] = byte(0x100 - dataTX[0]);
}
//**********************************************************************
//Prints via serial data read from the TAG in block "read_adress"
void printData()
{
  Serial.print("\n");
  Serial.println("Ready to read...");
  /////////////////////////////////////////////////////////////
  //Get the UID Identifier
  init(_CardID, aux);
  Serial.print("\n");
  Serial.print( "The UID : ");
  print(_CardID , 4);
  /////////////////////////////////////////////////////////////
  //Auntenticate a block with his keyAccess
  state = authenticate(_CardID, write_address, keyOld);
  Serial.print("\n");

  if ( state == 0) {
    Serial.println("Authentication block OK");
  } 
  else {
    Serial.println("Authentication failed");
  }
  /////////////////////////////////////////////////////////////
  //Read from address after authentication
  state = readData(write_address, aux);
  Serial.print("\n");

  if (state == 0) {
    Serial.println("Read block OK");
  } 
  else {
    Serial.println("Read failed");
  }

  Serial.print("\n");
  Serial.print("Data read: ");
  print(aux , 16);
  Serial.print("\n");
}

	
		

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