Interfacing RFID-RC522 With Arduino MEGA a Simple Sketch

Hai there in this tutorial i'm going to help you with interfacing RFID-RC522 with Arduino Mega 2560 to read the RFID and Display the Data on the Serial Monitor. so you can able to extend it on your own

You Need:

1. Arduino Mega or Arduino Uno (I used Mega)
2. RFID-RC522
3. 7 male to female jumper wires
4. Some ID cards (optional)
5. RFID Library (Must , Link Below)

Then Download the Below library and Add it to your Arduino IDE by clicking Sketch->Include Library-> Add .Zip Library in file menu

Step 1: Physical Connection Detail

simply connect the arduino with RFID-RC522 as shown in the above image .

Warning : supply only 3.3V otherwise module will burn out

Pin Out for Uno/Nano and Mega

RC522 MODULE    Uno/Nano     MEGA
SDA             D10          D9
SCK             D13          D52
MOSI            D11          D51
MISO            D12          D50
IRQ             N/A          N/A
GND             GND          GND
RST             D9           D8
3.3V            3.3V         3.3V

Step 2: Simple Code to Read and Print RFID Tags Value

Copy the Below code then upload it on your Arduino

/*
PINOUT:
RC522 MODULE    Uno/Nano     MEGA
SDA             D10          D9
SCK             D13          D52
MOSI            D11          D51
MISO            D12          D50
IRQ             N/A          N/A
GND             GND          GND
RST             D9           D8
3.3V            3.3V         3.3V
*/
/* Include the standard Arduino SPI library */
#include <SPI.h>
/* Include the RFID library */
#include <RFID.h>
/* Define the DIO used for the SDA (SS) and RST (reset) pins. */
#define SDA_DIO 9
#define RESET_DIO 8
/* Create an instance of the RFID library */
RFID RC522(SDA_DIO, RESET_DIO); 
void setup()
{ 
  Serial.begin(9600);
  /* Enable the SPI interface */
  SPI.begin(); 
  /* Initialise the RFID reader */
  RC522.init();
}
void loop()
{
  /* Has a card been detected? */
  if (RC522.isCard())
  {
    /* If so then get its serial number */
    RC522.readCardSerial();
    Serial.println("Card detected:");
    for(int i=0;i<5;i++)
    {
    Serial.print(RC522.serNum[i],DEC);
    //Serial.print(RC522.serNum[i],HEX); //to print card detail in Hexa Decimal format
    }
    Serial.println();
    Serial.println();
  }
  delay(1000);
}

Step 3: Simple Code for Super Market Application Using RFID

Copy the Below code then upload it on your Arduino. in the below the total purchase value will incremented when reading the card first time then decremented when reading the same for second time...

/*
PINOUT:
RC522 MODULE    Uno/Nano     MEGA
SDA             D10          D9
SCK             D13          D52
MOSI            D11          D51
MISO            D12          D50
IRQ             N/A          N/A
GND             GND          GND
RST             D9           D8
3.3V            3.3V         3.3V
*
* Include the standard Arduino SPI library */
#include 
/* Include the RFID library */
#include 
/* Define the DIO used for the SDA (SS) and RST (reset) pins. */
#define SDA_DIO 9
#define RESET_DIO 8
int productname[5]={228,18,37,75,24};
int product[5]={100,120,230,125,70};
int token[5]={0,0,0,0,0};
int Total;
/* Create an instance of the RFID library */
RFID RC522(SDA_DIO, RESET_DIO); 
void setup()
{ 
  Serial.begin(9600);
  /* Enable the SPI interface */
  SPI.begin(); 
  /* Initialise the RFID reader */
  RC522.init();
}
void loop()
{
  /* Temporary loop counter */
  byte i=0;
  byte j=0;
  byte k=0;
  int ID;
  /* Has a card been detected? */
  if (RC522.isCard())
  {
    /* If so then get its serial number */
    RC522.readCardSerial();
    Serial.print(RC522.serNum[i],DEC);
    //Serial.println("Card detected:");
    /* Output the serial number to the UART */
    ID=RC522.serNum[0];
    //Serial.print(ID);
    Serial.println(" ");
    for(i=0;i<5;i++)
    {
      if(productname[i]==ID)
      {
        Serial.println("Total Purchase");
        if(token[i]==0)
        {
          Total=Total+product[i];
          token[i]=1;
        }
        else
        {
          Total=Total-product[i];
          token[i]=0;
        }
        
        Serial.println(Total);
        break;
      }
      else if(i==5)
      { 
        Serial.println("Access Denied"); 
        break;
      }
    }
    Serial.println();
    Serial.println();
  }
  delay(1000);
}

Step 4: Conclusion.,

I would like to thank you for reading my tutorial. I would appreciate if you found it useful and drop a like (favorite) or ask me anything as it keeps me motivated to do these instructables. feel free to ask any questions that you need to know...

Happy Coding Arduino...