RC522 RFID Reader

Projects Programming
1

Hey Guys

I Am Trying To Get A RFID Reader Working With My Arduino, The RFID Reader I Have Is This One:

http://www.ebay.co.uk/itm/321284899631?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649

and it uses this library:

I Have Made Sure The Reader Works Using The Examples But I Have No Clue How To Write A Keyfobs Info Or How To Read It.
All I Want To Do Is Have An Arduino Read A Code From The RFID Card And Then Send A Serial Message Just Involving The Code From It

Any Help Would Be Great

2

aRE tHERE aNY eXAMPLES sUPPLIED wITH tHE lIBRARY ?

3

yes but they arnt exactly clear as to how to use the library

4

yes but they arnt exactly clear as to how to use the library

But, do they work? That would be the starting point.

aRE tHERE aNY eXAMPLES sUPPLIED wITH tHE lIBRARY ?

Pretty funny.

5

the examples only dump all the data available on the chip using one debug command which is no good or it reads data from the chip and then writes data, it doesn't tell me what its writing or how its writing it, it just does it, again, not that helpful :confused: anyone got any experience with this library?

6

the examples only dump all the data available on the chip using one debug command which is no good

What is no good? The code example or the data?

or it reads data from the chip and then writes data, it doesn't tell me what its writing or how its writing it

What it's writing, and how, is hard-coded. Open your eyes; read the code. If you don't understand it, that's fine. But, you need to post the code if you want help understanding it.

7

SORTED IT!

i managed to work out what functions control the reading of the UID from the cards and key fobs and have now got that working, thanks for all the help guys!!!! :smiley:

I've included the code below for anyone who needs it, all it does is read the UID then print it to the serial port in a HEX format

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

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

void setup() {
  Serial.begin(9600);	// Initialize serial communications with the PC
  SPI.begin();			// Init SPI bus
  mfrc522.PCD_Init();	// Init MFRC522 card
 // Serial.println("Ready!");
}

void loop() {
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent()) {
    return;
  }

// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
  return;
}
//Serial.print("Card 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.println();
        delay(5000);
}
8

return inside the loop() function always looks odd to me. Even though it works it is not obvious where it is returning to as the code that calls loop() repeatedly is hidden from view.

My preferred way would be something like this.

void loop() 
{
  // Look for new cards
  if (mfrc522.PICC_IsNewCardPresent() && mfrc522.PICC_ReadCardSerial()) 
  {
    //Serial.print("Card 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.println();
    delay(5000);
  }
}

which I personally find easier to read and understand, but each to their own.