RFID,NFC Module(RC522)

This is an RFID reader utilizing NFC communication method.

It can be used with Arduino and Raspberry Pi boards.

Specifications

• Operating Voltage: 3.3V
• Operating Current: 13mA ~ 26mA
• Interface: SPI
• Operating Frequency: 13.56MHz

Hardware

• Arduino
• RC522, NFC card/key
• Jumper cables

Connection

RC522				Arduino
3.3V				3.3V
RST				9
GND				GND
MISO				12
MOSI				11
SCK				13
SDA				10

Libraries

• MFRC522 (by GithubCommunity)
• SPI (default included library)

Example Code

Prints the tagged ID value to the serial monitor.

#include <SPI.h>
#include <MFRC522.h>
 
#define RST_PIN   9                            // Reset pin is set to pin 9
#define SS_PIN    10                           // SS pin is set to pin 10
                                               // SS pin is the pin responsible for data exchange (SS = Slave Selector)
 
MFRC522 mfrc(SS_PIN, RST_PIN);                 // Creating the mfrc object to utilize the MFR522
 
void setup() {
  Serial.begin(9600);                          // Serial communication, baud rate is set to 9600
  SPI.begin();                                 // Initializing SPI
                                               // (SPI: Communication method between one master and multiple slaves)
  mfrc.PCD_Init();                             // Initializing MFRC522
}
 
void loop() {
  if (!mfrc.PICC_IsNewCardPresent() || !mfrc.PICC_ReadCardSerial()) {   
                                               // When no tag is detected or ID is not read
    delay(500);                                // 0.5 second delay
    return;                                    // Return
  } 
    
  Serial.print("Card UID:");                   // Printing the tag's ID
  
  for (byte i = 0; i < 4; i++) {               // Loop to print the tag's ID, up to the tag's ID size (4)
    Serial.print(mfrc.uid.uidByte[i]);        // Printing from mfrc.uid.uidByte[0] to mfrc.uid.uidByte[3]
    Serial.print(" ");                         // Printing space between IDs
  }
  Serial.println(); 
}

Execution Result