YSEF IoT

RFID / NFC Module (RC522)

The RFID / NFC Module is a contactless identification device used in IoT and robotics applications. It uses electromagnetic fields to read tags and cards — making it ideal for access control, attendance systems, and automation projects.

How It Works?

The module communicates via the SPI protocol with a microcontroller (like Arduino or ESP32). When an RFID tag or card is brought near the antenna, it transfers a unique ID that the system can verify, log, or act upon.

Key Features

Supports 13.56 MHz RFID/NFC frequency
Reads MIFARE and other compatible cards
SPI interface for fast communication
Compact, easy to integrate with Arduino
Low power, ideal for embedded systems


// RFID Module (RC522) Example with Arduino

#include 
#include 

#define SS_PIN 10
#define RST_PIN 9

MFRC522 rfid(SS_PIN, RST_PIN);

void setup() {
  Serial.begin(9600);
  SPI.begin();         // Initialize SPI bus
  rfid.PCD_Init();     // Initialize RFID reader
  Serial.println("YSEF RFID Reader Ready");
}

void loop() {
  // Check if a new card is present and can be read
  if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) {
    return;  // No card found, exit loop
  }

  Serial.print("Card UID:");

  // Print UID bytes in hex format, with leading zeros if needed
  for (byte i = 0; i < rfid.uid.size; i++) {
    Serial.print(rfid.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(rfid.uid.uidByte[i], HEX);
  }
  Serial.println();

  // Halt PICC (Proximity Integrated Circuit Card)
  rfid.PICC_HaltA();
  // Stop encryption on PCD (Proximity Coupling Device)
  rfid.PCD_StopCrypto1();
}

Applications of RFID / NFC Module

RFID and NFC modules are widely used for security, automation, and smart systems.

Access Control

Used for door locks and secure entry systems with RFID cards.

Attendance Systems

Automates employee or student attendance tracking.

Robotics

Identifies components or triggers robot actions via tags.

Inventory Systems

Tracks items and assets in smart warehouses or IoT setups.

RFID / NFC Module