RFID Card Reader help

hello all,

i'm looking setting rc522 rfid reader/writer , need pulling , storing card id numbers. i'm using mega2560. i'm trying "simple" access granted (green led) access denied (red led).

i'm using rc522 library miguelbalboa , rfid_default_keys example sketch base, works fine , can read 3 of badges.

from i've learned reading have try , pull card id number dump_byte_array function , create string. compare array of cards have. sounds simple cannot find way acquire card id , store it.

i've searched past 3 days , seem find same builds , sketches not 1 i'm looking for. i'm "noob" may have on looked in search. may making way more complicated have thats why i'm asking experts.



anywho. have figured out here how grab data cards,

code: [select]

}

void dump_byte_array(byte *buffer, byte buffersize) {
    (byte = 0; < buffersize; i++) {
        serial.print(buffer[i] < 0x10 ? " 0" : " ");
        serial.print(buffer[i], hex);
    }
}

and here how write serial port.

code: [select]

void loop() {
    // new cards
    if ( ! mfrc522.picc_isnewcardpresent())
        return;

    // select 1 of cards
    if ( ! mfrc522.picc_readcardserial())
        return;
    // show details of picc (that is: tag/card)
    serial.print("card id:");
    dump_byte_array(mfrc522.uid.uidbyte, mfrc522.uid.size);
    serial.println();
    serial.print("picc type: ");
    byte picctype = mfrc522.picc_gettype(mfrc522.uid.sak);


i don't know how can intercept information , make usable form me.





and here whole sketch. put in steve bill , bob , card id's don't lose them.

code: [select]


#include <spi.h>
#include <mfrc522.h>


#define rst_pin         5           // configurable, see typical pin layout above
#define ss_pin          53          // configurable, see typical pin layout above
#define steve           c3 b0 8b f4
#define bill            a3 3e 75 d5
#define bob             d6 b7 e7 3d

mfrc522 mfrc522(ss_pin, rst_pin);   // create mfrc522 instance.

// number of known default keys (hard-coded)
// note: synchronize nr_known_keys define defaultkeys[] array
#define nr_known_keys   8
// known keys, see: https://code.google.com/p/mfcuk/wiki/mifareclassicdefaultkeys
byte knownkeys[nr_known_keys][mfrc522::mf_key_size] =  {
    {0xff, 0xff, 0xff, 0xff, 0xff, 0xff}, // ff ff ff ff ff ff = factory default
    {0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5}, // a0 a1 a2 a3 a4 a5
    {0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5}, // b0 b1 b2 b3 b4 b5
    {0x4d, 0x3a, 0x99, 0xc3, 0x51, 0xdd}, // 4d 3a 99 c3 51 dd
    {0x1a, 0x98, 0x2c, 0x7e, 0x45, 0x9a}, // 1a 98 2c 7e 45 9a
    {0xd3, 0xf7, 0xd3, 0xf7, 0xd3, 0xf7}, // d3 f7 d3 f7 d3 f7
    {0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff}, // aa bb cc dd ee ff
    {0x00, 0x00, 0x00, 0x00, 0x00, 0x00}  // 00 00 00 00 00 00
};

/*
 * initialize.
 */
void setup() {
      pinmode (led1, output);
    serial.begin(9600);         // initialize serial communications pc
    spi.begin();                // init spi bus
    mfrc522.pcd_init();         // init mfrc522 card
    serial.println("try used default keys print block 0 of mifare picc.");

}

/*
 * helper routine dump byte array hex values serial.
 */
void dump_byte_array(byte *buffer, byte buffersize) {
    (byte = 0; < buffersize; i++) {
        serial.print(buffer[i] < 0x10 ? " 0" : " ");
        serial.print(buffer[i], hex);
    }
}

/*
 * try using picc (the tag/card) given key access block 0.
 * on success, show key details, , dump block data on serial.
 *
 * @return true when given key worked, false otherwise.
 */
boolean try_key(mfrc522::mifare_key *key)
{
    boolean result = false;
    byte buffer[18];
    byte block = 0;
    byte status;
   
    // serial.println("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("pcd_authenticate() failed: ");
        // serial.println(mfrc522.getstatuscodename(status));
        return false;
    }

    // read block
    byte bytecount = sizeof(buffer);
    status = mfrc522.mifare_read(block, buffer, &bytecount);
    if (status != mfrc522::status_ok) {
        // serial.print("mifare_read() failed: ");
        // serial.println(mfrc522.getstatuscodename(status));
    }
    else {
        // successful read
        result = true;
        serial.print("success key:");
        dump_byte_array((*key).keybyte, mfrc522::mf_key_size);
        serial.println();
        // dump block data
        serial.print("block "); serial.print(block); serial.print(":");
        dump_byte_array(buffer, 16);
        serial.println();
       
      }
    serial.println();

    mfrc522.picc_halta();       // halt picc
    mfrc522.pcd_stopcrypto1();  // stop encryption on pcd
    return result;
   
}

/*
 * main loop.
 */
void loop() {
    // new cards
    if ( ! mfrc522.picc_isnewcardpresent())
        return;

    // select 1 of cards
    if ( ! mfrc522.picc_readcardserial())
        return;
digitalwrite(led1, high);
    // show details of picc (that is: tag/card)
    serial.print("card id:");
    dump_byte_array(mfrc522.uid.uidbyte, mfrc522.uid.size);
    serial.println();
    serial.print("picc type: ");
    byte picctype = mfrc522.picc_gettype(mfrc522.uid.sak);
   
   
   
   
    // try known default keys
    mfrc522::mifare_key key;
    (byte k = 0; k < nr_known_keys; k++) {
        // copy known key mifare_key structure
        (byte = 0; < mfrc522::mf_key_size; i++) {
            key.keybyte[i] = knownkeys[k][i];
        }
        // try key
        if (try_key(&key)) {
            // found , reported on key , block,
            // no need try other keys picc
            break;
        }

  }

}

quote

from i've learned reading have try , pull card id number dump_byte_array function , create string.

no, have card data array of bytes. can compare array array of bytes. don't piss away resources on strings.

quote

i don't know how can intercept information , make usable form me.

you don't need "intercept" anything. data right there, in mfrc522.uid.uidbyte. number of elements in uidbyte array in mfrc522.uid.size.

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