MFRC522 RFID Tutorial

In this Project, we will see about how to interface MFRC522 RFID with Arduino .

Circuit Diagram:

Arduino Code:

rfid_code.ino

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

const int myLED = 2;
MFRC522 mfrc522(10, 9);   //SS_PIN,RST_PIN

void setup() {
  Serial.begin(9600);   // Initiate a serial communication
  SPI.begin();      // Initiate  SPI bus
  mfrc522.PCD_Init();   // Initiate MFRC522
  
  pinMode(myLED, OUTPUT);
  digitalWrite(myLED,LOW);
  Serial.println("Ready...");
}

void loop() {
  if ( ! mfrc522.PICC_IsNewCardPresent()){
    return;
  }
  if ( ! mfrc522.PICC_ReadCardSerial()){
    return;
  }

  Serial.print("UID tag    :");
  String content= "";
  for (byte i = 0; i < mfrc522.uid.size; i++){
     Serial.print(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ");  
     Serial.print(mfrc522.uid.uidByte[i], HEX);
     content.concat(String(mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " "));
     content.concat(String(mfrc522.uid.uidByte[i], HEX));
  }
  Serial.println();
  Serial.print("LED Status : ");
  content.toUpperCase();
  if (content.substring(1) == "22 42 AE 34"){           //Change Your UID here
    digitalWrite(myLED, HIGH);
    Serial.println("LED ON");
    Serial.println("");    
  }
  
  else if (content.substring(1) == "B9 80 09 BA"){      //Change Your UID here
    digitalWrite(myLED, LOW);
    Serial.println("LED OFF");
    Serial.println("");
  }
}

Library Used:

1) rfid - https://github.com/miguelbalboa/rfid/

Youtube Video Tutorial:

https://youtu.be/GXU8uaK9nNg

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You can get the all the required files (like Circuit Diagram, Arduino.ino file, Libraries Used, and others) for the project  in ZIP format and much more...