RFID on arduino MEGA 2560

Firstly, hello there, i purchased my first arduino a few days ago and im loving it. I have a rig set up in my room to use this as an RFID entry system. The people i purchased the kit off gave me some code for the RFID reader which works and has allowed me to add in my own commands for moving the deadbolt and lighting up a green LED when a card is detected ETC however i decided to scan the RFID reader with mine and my brothers college cards and it opens the lock with any RFID card baisically. Below i will post my code but im looking for a way to define the cards to accept and the ones to detect. If it helps, when i scan the cards i am given the ID's which are as follows ....

College card -93F9B532

key chain - F3BB3EAA

blank card -B5AA59B3

when i scan the cards or keychain the serial monitor displays that as the card number. Is it possible to make the code accept say the college card and they keychain and deny the blank card? Any help or suggestions are much appreciated.

Thank you for your help :slight_smile:

Okay, that code is way above my level of knowledge, but I would think a simple If..Then..Else controller would do the trick. Simply, If the KeyID = 93F9B532, then do myservo.write. I think this code may be a bit long-winded for your purposes. I've never worked with RFID before, but I'm going to be setting up a rig like yours for the club's classroom at the school to lock other people out. Good luck!

-xian

now i tried that and yeah, its way above what i can deal with too :confused: but i mean inside the bit of code below which is what is activated when a card is detected i tried an if statement which was baisically if serNum matched the a string which was the ID of the card then to have the motor code in there but looking closer. serNUM seems to be hex which is converted to a string when printed out so i cant compare hex to a string.

 if (status == MI_OK)
  {

  }

:blush: man this is complicated, Ive decided to stop looking for the answer to this for a moment and work on the button and getting LED’s just right and then have a break and come back and dig for the answer again :confused:

Well good luck. Hopefully someone who knows a bit more than me will be able to help. I'll send one of my friends over if I can.

There is an option, under the Additional Options... link, to attach your code to your post, so you don't have to put it in the rubbish bin (which I can't access).

PaulS:
There is an option, under the Additional Options... link, to attach your code to your post, so you don't have to put it in the rubbish bin (which I can't access).

Ah, thanks. I didn't know that, I'll keep that in mind for my own posts later on. xD

its too large :frowning:

Well im going to ask some tutors at my college to go over the code and see if they can help me on tuesday, until then i decided to just hook it up :stuck_out_tongue: Arduino RFID door lock system - YouTube

its too large

I can't imagine how a 4Meg file will compile to fit on the Mega.

PaulS:
I can't imagine how a 4Meg file will compile to fit on the Mega.

Maybe using a USB shield or a memory card? Would that work, or no?

Maybe using a USB shield or a memory card? Would that work, or no?

No. The compiled hex file has to fit in Flash Memory. A 4.0+ Meg source file will not produce a hex file that fits on any Arduino.

Ah ok. Well, this seems to be a problem.

No no, by too large i mean the person that wanted to see the code asked if i could paste it on here inside the code tags but its too large to put in there as it is longer than 9600 characters

Oh. OK.

Trias95:
No no, by too large i mean the person that wanted to see the code asked if i could paste it on here inside the code tags but its too large to put in there as it is longer than 9600 characters

The limit when you just paste code into your post is 9500 characters. The limit when you use Additional Options... is 4,000,000 characters. Pay attention, son!

#include <SPI.h>
#include <Servo.h>
#define uchar unsigned char
#define uint unsigned int
 
//data array maxium length
#define MAX_LEN 16
 
/////////////////////////////////////////////////////////////////////
//set the pin
/////////////////////////////////////////////////////////////////////
const int chipSelectPin = 53;
const int NRSTPD = 5;
const int led = 13;
int pos = 0;
Servo myservo;
int once = 0;
 
//MF522 command bits
#define PCD_IDLE 0x00 //NO action; cancel current commands
#define PCD_AUTHENT 0x0E //verify password key
#define PCD_RECEIVE 0x08 //receive data
#define PCD_TRANSMIT 0x04 //send data
#define PCD_TRANSCEIVE 0x0C //send and receive data
#define PCD_RESETPHASE 0x0F //reset
#define PCD_CALCCRC 0x03 //CRC check and caculation
 
//Mifare_One card command bits
#define PICC_REQIDL 0x26 //Search the cards that not into sleep mode in the antenna area
#define PICC_REQALL 0x52 //Search all the cards in the antenna area
#define PICC_ANTICOLL 0x93 //prevent conflict
#define PICC_SElECTTAG 0x93 //select card
#define PICC_AUTHENT1A 0x60 //verify A password key
#define PICC_AUTHENT1B 0x61 //verify B password key
#define PICC_READ 0x30 //read
#define PICC_WRITE 0xA0 //write
#define PICC_DECREMENT 0xC0 //deduct value
#define PICC_INCREMENT 0xC1 //charge up value
#define PICC_RESTORE 0xC2 //Restore data into buffer
#define PICC_TRANSFER 0xB0 //Save data into buffer
#define PICC_HALT 0x50 //sleep mode
 
 
//THe mistake code that return when communicate with MF522
#define MI_OK 0
#define MI_NOTAGERR 1
#define MI_ERR 2
 
 
//------------------MFRC522 register ---------------
//Page 0:Command and Status
#define Reserved00 0x00
#define CommandReg 0x01
#define CommIEnReg 0x02
#define DivlEnReg 0x03
#define CommIrqReg 0x04
#define DivIrqReg 0x05
#define ErrorReg 0x06
#define Status1Reg 0x07
#define Status2Reg 0x08
#define FIFODataReg 0x09
#define FIFOLevelReg 0x0A
#define WaterLevelReg 0x0B
#define ControlReg 0x0C
#define BitFramingReg 0x0D
#define CollReg 0x0E
#define Reserved01 0x0F
//Page 1:Command
#define Reserved10 0x10
#define ModeReg 0x11
#define TxModeReg 0x12
#define RxModeReg 0x13
#define TxControlReg 0x14
#define TxAutoReg 0x15
#define TxSelReg 0x16
#define RxSelReg 0x17
#define RxThresholdReg 0x18
#define DemodReg 0x19
#define Reserved11 0x1A
#define Reserved12 0x1B
#define MifareReg 0x1C
#define Reserved13 0x1D
#define Reserved14 0x1E
#define SerialSpeedReg 0x1F
//Page 2:CFG
#define Reserved20 0x20
#define CRCResultRegM 0x21
#define CRCResultRegL 0x22
#define Reserved21 0x23
#define ModWidthReg 0x24
#define Reserved22 0x25
#define RFCfgReg 0x26
#define GsNReg 0x27
#define CWGsPReg 0x28
#define ModGsPReg 0x29
#define TModeReg 0x2A
#define TPrescalerReg 0x2B
#define TReloadRegH 0x2C
#define TReloadRegL 0x2D
#define TCounterValueRegH 0x2E
#define TCounterValueRegL 0x2F
//Page 3:TestRegister
#define Reserved30 0x30
#define TestSel1Reg 0x31
#define TestSel2Reg 0x32
#define TestPinEnReg 0x33
#define TestPinValueReg 0x34
#define TestBusReg 0x35
#define AutoTestReg 0x36
#define VersionReg 0x37
#define AnalogTestReg 0x38
#define TestDAC1Reg 0x39
#define TestDAC2Reg 0x3A
#define TestADCReg 0x3B
#define Reserved31 0x3C
#define Reserved32 0x3D
#define Reserved33 0x3E
#define Reserved34 0x3F
//-----------------------------------------------
 
//4 bytes Serial number of card, the 5 bytes is verfiy bytes
uchar serNum[5];
 
 
void setup()
{
  Serial.begin(57600);
 
  SPI.begin();
 
  pinMode(led,OUTPUT);
 
  pinMode(chipSelectPin,OUTPUT); // Set digital pin 10 as OUTPUT to connect it to the RFID /ENABLE pin
  digitalWrite(chipSelectPin, LOW); // Activate the RFID reader
  pinMode(NRSTPD,OUTPUT); // Set digital pin 5 , Not Reset and Power-down
  myservo.attach(9);
  MFRC522_Init();
}
 
 
void loop()
{
 
  uchar status;
  uchar str[MAX_LEN];
 
 
  // Search card, return card types
  status = MFRC522_Request(PICC_REQIDL, str);
  if (status != MI_OK)
  {
    if(once == 0){
      pos = 20;
      myservo.write(pos);
      once++;
    }
 
    digitalWrite(led,LOW);
    return;
  }
 
 
  // Show card type
  ShowCardType(str);
 
  //Prevent conflict, return the 4 bytes Serial number of the card
  status = MFRC522_Anticoll(str);
 
  // str[0..3]: serial number of the card
  // str[4]: XOR checksum of the SN.
  if (status == MI_OK)
  {
   
   
    Serial.print("The card's number is: ");
    memcpy(serNum, str, 5);
    ShowCardID(serNum);
    digitalWrite(led,HIGH);
    pos = 180;
    myservo.write(pos);
    once = 0;
    delay(10000);
 
  }
 
 
 
  MFRC522_Halt(); //command the card into sleep mode
 
  delay(200);
}
 
/*
 * Function?ShowCardID
 * Description?Show Card ID
 * Input parameter?ID string
 * Return?Null
 */
void ShowCardID(uchar *id)
{
  int IDlen=4;
  for(int i=0; i<IDlen; i++){
    Serial.print(0x0F & (id[i]>>4), HEX);
    Serial.print(0x0F & id[i],HEX);
  }
  Serial.println("");
}
 
/*
 * Function?ShowCardType
 * Description?Show Card type
 * Input parameter?Type string
 * Return?Null
 */
void ShowCardType(uchar* type)
{
  Serial.print("Card type: ");
  if(type[0]==0x04&&type[1]==0x00)
    Serial.println("MFOne-S50");
  else if(type[0]==0x02&&type[1]==0x00)
    Serial.println("MFOne-S70");
  else if(type[0]==0x44&&type[1]==0x00)
    Serial.println("MF-UltraLight");
  else if(type[0]==0x08&&type[1]==0x00)
    Serial.println("MF-Pro");
  else if(type[0]==0x44&&type[1]==0x03)
    Serial.println("MF Desire");
  else
    Serial.println("Unknown");
}
 
/*
 * Function?Write_MFRC5200
 * Description?write a byte data into one register of MR RC522
 * Input parameter?addr--register address?val--the value that need to write in
 * Return?Null
 */
void Write_MFRC522(uchar addr, uchar val)
{
  digitalWrite(chipSelectPin, LOW);
 
  //address format?0XXXXXX0
  SPI.transfer((addr<<1)&0x7E);
  SPI.transfer(val);
 
  digitalWrite(chipSelectPin, HIGH);
}
 
 
/*
 * Function?Read_MFRC522
 * Description?read a byte data into one register of MR RC522
 * Input parameter?addr--register address
 * Return?return the read value
 */
uchar Read_MFRC522(uchar addr)
{
  uchar val;
 
  digitalWrite(chipSelectPin, LOW);
 
  //address format?1XXXXXX0
  SPI.transfer(((addr<<1)&0x7E) | 0x80);
  val =SPI.transfer(0x00);
 
  digitalWrite(chipSelectPin, HIGH);
 
  return val;
}
 
/*
 * Function?SetBitMask
 * Description?set RC522 register bit
 * Input parameter?reg--register address;mask--value
 * Return?null
 */
void SetBitMask(uchar reg, uchar mask)
{
  uchar tmp;
  tmp = Read_MFRC522(reg);
  Write_MFRC522(reg, tmp | mask); // set bit mask
}
 
 
/*
 * Function?ClearBitMask
 * Description?clear RC522 register bit
 * Input parameter?reg--register address;mask--value
 * Return?null
 */
void ClearBitMask(uchar reg, uchar mask)
{
  uchar tmp;
  tmp = Read_MFRC522(reg);
  Write_MFRC522(reg, tmp & (~mask)); // clear bit mask
}
 
 
/*
 * Function?AntennaOn
 * Description?Turn on antenna, every time turn on or shut down antenna need at least 1ms delay
 * Input parameter?null
 * Return?null
 */
void AntennaOn(void)
{
  uchar temp;
 
  temp = Read_MFRC522(TxControlReg);
  if (!(temp & 0x03))
  {
    SetBitMask(TxControlReg, 0x03);
  }
}
 
 
/*
 * Function?AntennaOff
 * Description?Turn off antenna, every time turn on or shut down antenna need at least 1ms delay
 * Input parameter?null
 * Return?null
 */
void AntennaOff(void)
{
  ClearBitMask(TxControlReg, 0x03);
}
 
 
/*
 * Function?ResetMFRC522
 * Description? reset RC522
 * Input parameter?null
 * Return?null
 */
void MFRC522_Reset(void)
{
  Write_MFRC522(CommandReg, PCD_RESETPHASE);
}
 
 
/*
 * Function?InitMFRC522
 * Description?initilize RC522
 * Input parameter?null
 * Return?null
 */
void MFRC522_Init(void)
{
  digitalWrite(NRSTPD,HIGH);
 
  MFRC522_Reset();
 
  //Timer: TPrescaler*TreloadVal/6.78MHz = 24ms
  Write_MFRC522(TModeReg, 0x8D); //Tauto=1; f(Timer) = 6.78MHz/TPreScaler
  Write_MFRC522(TPrescalerReg, 0x3E); //TModeReg[3..0] + TPrescalerReg
  Write_MFRC522(TReloadRegL, 30);
  Write_MFRC522(TReloadRegH, 0);
 
  Write_MFRC522(TxAutoReg, 0x40); //100%ASK
  Write_MFRC522(ModeReg, 0x3D); //CRC initilizate value 0x6363 ???
 
  //ClearBitMask(Status2Reg, 0x08); //MFCrypto1On=0
  //Write_MFRC522(RxSelReg, 0x86); //RxWait = RxSelReg[5..0]
  //Write_MFRC522(RFCfgReg, 0x7F); //RxGain = 48dB
 
  AntennaOn(); //turn on antenna
}
/*
 * Function?MFRC522_Request
 * Description?Searching card, read card type
 * Input parameter?reqMode--search methods?
 * TagType--return card types
 * 0x4400 = Mifare_UltraLight
 * 0x0400 = Mifare_One(S50)
 * 0x0200 = Mifare_One(S70)
 * 0x0800 = Mifare_Pro(X)
 * 0x4403 = Mifare_DESFire
 * return?return MI_OK if successed
 */
uchar MFRC522_Request(uchar reqMode, uchar *TagType)
{
  uchar status;
  uint backBits; //the data bits that received
 
  Write_MFRC522(BitFramingReg, 0x07); //TxLastBists = BitFramingReg[2..0] ???
 
  TagType[0] = reqMode;
  status = MFRC522_ToCard(PCD_TRANSCEIVE, TagType, 1, TagType, &backBits);
 
  if ((status != MI_OK) || (backBits != 0x10))
  {
    status = MI_ERR;
  }
 
  return status;
}
 
 
/*
 * Function?MFRC522_ToCard
 * Description?communicate between RC522 and ISO14443
 * Input parameter?command--MF522 command bits
 * sendData--send data to card via rc522
 * sendLen--send data length
 * backData--the return data from card
 * backLen--the length of return data
 * return?return MI_OK if successed
 */
uchar MFRC522_ToCard(uchar command, uchar *sendData, uchar sendLen, uchar *backData, uint *backLen)
{
  uchar status = MI_ERR;
  uchar irqEn = 0x00;
  uchar waitIRq = 0x00;
  uchar lastBits;
  uchar n;
  uint i;
 
  switch (command)
  {
  case PCD_AUTHENT: //verify card password
    {
      irqEn = 0x12;
      waitIRq = 0x10;
      break;
    }
  case PCD_TRANSCEIVE: //send data in the FIFO
    {
      irqEn = 0x77;
      waitIRq = 0x30;
      break;
    }
  default:
    break;
  }
 
  Write_MFRC522(CommIEnReg, irqEn|0x80); //Allow interruption
  ClearBitMask(CommIrqReg, 0x80); //Clear all the interrupt bits
  SetBitMask(FIFOLevelReg, 0x80); //FlushBuffer=1, FIFO initilizate
 
  Write_MFRC522(CommandReg, PCD_IDLE); //NO action;cancel current command ???
 
  //write data into FIFO
  for (i=0; i<sendLen; i++)
  {
    Write_MFRC522(FIFODataReg, sendData[i]);
  }
 
  //procceed it
  Write_MFRC522(CommandReg, command);
  if (command == PCD_TRANSCEIVE)
  {
    SetBitMask(BitFramingReg, 0x80); //StartSend=1,transmission of data starts
  }
 
  //waite receive data is finished
  i = 2000; //i should adjust according the clock, the maxium the waiting time should be 25 ms???
  do
  {
    //CommIrqReg[7..0]
    //Set1 TxIRq RxIRq IdleIRq HiAlerIRq LoAlertIRq ErrIRq TimerIRq
    n = Read_MFRC522(CommIrqReg);
    i--;
  }
  while ((i!=0) && !(n&0x01) && !(n&waitIRq));
 
  ClearBitMask(BitFramingReg, 0x80); //StartSend=0
 
    if (i != 0)
  {
    if(!(Read_MFRC522(ErrorReg) & 0x1B)) //BufferOvfl Collerr CRCErr ProtecolErr
    {
      status = MI_OK;
      if (n & irqEn & 0x01)
      {
        status = MI_NOTAGERR; //??
      }
 
      if (command == PCD_TRANSCEIVE)
      {
        n = Read_MFRC522(FIFOLevelReg);
        lastBits = Read_MFRC522(ControlReg) & 0x07;
        if (lastBits)
        {
          *backLen = (n-1)*8 + lastBits;
        }
        else
        {
          *backLen = n*8;
        }
 
        if (n == 0)
        {
          n = 1;
        }
        if (n > MAX_LEN)
        {
          n = MAX_LEN;
        }
 
        //read the data from FIFO
        for (i=0; i<n; i++)
        {
          backData[i] = Read_MFRC522(FIFODataReg);
        }
      }
    }
    else
    {
      status = MI_ERR;
    }
 
  }
 
  //SetBitMask(ControlReg,0x80); //timer stops
  //Write_MFRC522(CommandReg, PCD_IDLE);
 
  return status;
}
 
 
/*
 * Function?MFRC522_Anticoll
 * Description?Prevent conflict, read the card serial number
 * Input parameter?serNum--return the 4 bytes card serial number, the 5th byte is recheck byte
 * return?return MI_OK if successed
 */
uchar MFRC522_Anticoll(uchar *serNum)
{
  uchar status;
  uchar i;
  uchar serNumCheck=0;
  uint unLen;
 
  //ClearBitMask(Status2Reg, 0x08); //strSensclear
  //ClearBitMask(CollReg,0x80); //ValuesAfterColl
  Write_MFRC522(BitFramingReg, 0x00); //TxLastBists = BitFramingReg[2..0]
 
  serNum[0] = PICC_ANTICOLL;
  serNum[1] = 0x20;
  status = MFRC522_ToCard(PCD_TRANSCEIVE, serNum, 2, serNum, &unLen);
 
  if (status == MI_OK)
  {
    //Verify card serial number
    for (i=0; i<4; i++)
    {
      serNumCheck ^= serNum[i];
    }
    if (serNumCheck != serNum[i])
    {
      status = MI_ERR;
    }
  }
 
  //SetBitMask(CollReg, 0x80); //ValuesAfterColl=1
 
  return status;
}
 
 
/*
 * Function?CalulateCRC
 * Description?Use MF522 to caculate CRC
 * Input parameter?pIndata--the CRC data need to be read?len--data length?pOutData-- the caculated result of CRC
 * return?Null
 */
void CalulateCRC(uchar *pIndata, uchar len, uchar *pOutData)
{
  uchar i, n;
 
  ClearBitMask(DivIrqReg, 0x04); //CRCIrq = 0
  SetBitMask(FIFOLevelReg, 0x80); //Clear FIFO pointer
  //Write_MFRC522(CommandReg, PCD_IDLE);
 
  //Write data into FIFO
  for (i=0; i<len; i++)
  {
    Write_MFRC522(FIFODataReg, *(pIndata+i));
  }
  Write_MFRC522(CommandReg, PCD_CALCCRC);
 
  //waite CRC caculation to finish
  i = 0xFF;
  do
  {
    n = Read_MFRC522(DivIrqReg);
    i--;
  }
  while ((i!=0) && !(n&0x04)); //CRCIrq = 1
 
  //read CRC caculation result
  pOutData[0] = Read_MFRC522(CRCResultRegL);
  pOutData[1] = Read_MFRC522(CRCResultRegM);
}
 
 
 
/*
 * Function?MFRC522_Write
 * Description?write block data
 * Input parameters?blockAddr--block address;writeData--Write 16 bytes data into block
 * return?return MI_OK if successed
 */
uchar MFRC522_Write(uchar blockAddr, uchar *writeData)
{
  uchar status;
  uint recvBits;
  uchar i;
  uchar buff[18];
 
  buff[0] = PICC_WRITE;
  buff[1] = blockAddr;
  CalulateCRC(buff, 2, &buff[2]);
  status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 4, buff, &recvBits);
 
  if ((status != MI_OK) || (recvBits != 4) || ((buff[0] & 0x0F) != 0x0A))
  {
    status = MI_ERR;
  }
 
  if (status == MI_OK)
  {
    for (i=0; i<16; i++) //Write 16 bytes data into FIFO
    {
      buff[i] = *(writeData+i);
    }
    CalulateCRC(buff, 16, &buff[16]);
    status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 18, buff, &recvBits);
 
    if ((status != MI_OK) || (recvBits != 4) || ((buff[0] & 0x0F) != 0x0A))
    {
      status = MI_ERR;
    }
  }
 
  return status;
}
 
 
/*
 * Function?MFRC522_Halt
 * Description?Command the cards into sleep mode
 * Input parameters?null
 * return?null
 */
void MFRC522_Halt(void)
{
  uchar status;
  uint unLen;
  uchar buff[4];
 
  buff[0] = PICC_HALT;
  buff[1] = 0;
  CalulateCRC(buff, 2, &buff[2]);
 
  status = MFRC522_ToCard(PCD_TRANSCEIVE, buff, 4, buff,&unLen);
}

I had a look under additional options and i couldn't see anything for more characters so i split the code in two. Sorry

I had a look under additional options and i couldn't see anything for more characters so i split the code in two. Sorry

When you click Additional Options, there is button labeled Browse... Give that a try. I am NOT going to paste your code back together.

Since it's been so long, you might want to summarize what the problem is, too.

Trias95:
I had a look under additional options and i couldn’t see anything for more characters so i split the code in two. Sorry

If you can’t follow a simple instruction like posting code as a file under the additional options how do you expect to understand any advice we may be able to give you?