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RFID RC522 Reader with Card/Key Fob Set

Control

Set of a reader module that reads 13.56 MHz RFID cards and key fobs from a few centimetres away, plus a white card and a key fob; for card door locks, attendance and identification projects. It connects to the Arduino over SPI, and the MFRC522 library reads each card's unique number (UID). The module runs on 3.3V: never connect VCC to 5V. The pin headers usually come unsoldered. Since a UID can be copied, do not rely on it alone where real security matters.

Specifications

Chip

NXP MFRC522

Frequency

13.56 MHz (ISO 14443A, MIFARE)

Supply

3.3V (never 5V)

Interface

SPI (also I2C / UART)

Read range

~3 - 5 cm

Pins

SDA (SS), SCK, MOSI, MISO, IRQ, GND, RST, 3.3V

Uno wiring

SDA 10, SCK 13, MOSI 11, MISO 12, RST 9

In the set

Reader, MIFARE Classic 1K card and key fob, pin headers

Shop prices

• RobocomboIn stock57.00 ₺
• ElektrovadiIn stock70.94 ₺
• MotorobitIn stock75.75 ₺
• Modül ElektronikIn stock78.28 ₺
• KomponentciIn stock84.08 ₺
• HatfonIn stock85.74 ₺
• HobiDevreIn stock97.92 ₺
• RobotsepetiIn stock109.72 ₺
• RobitshopIn stockPrice at the shop
• Robo90Out of stock65.47 ₺
• RobotistanOut of stock65.89 ₺
• RobotzadeOut of stock66.00 ₺
• Robolink MarketOut of stock84.00 ₺
• F1 DepoOut of stock96.00 ₺

Prices read from the shops' pages on 22 October 2026. Prices and stock may have changed since; check at the shop before you buy.

Projects with this part

• RFID Card Door LockIntermediate60 minA door lock that opens with a card or key fob you have introduced: the RC522 reader reads the card's number, and if it is known the green LED lights up, a short beep sounds and the servo turns the latch and opens the door for 5 seconds; an unknown card lights the red LED and sounds a long beep. The first card you scan becomes the master card: scanning it opens adding mode for 10 seconds, and a new card scanned meanwhile is added, a known one removed. The cards are kept in the Arduino's EEPROM memory, so they are not forgotten when the power goes. It teaches talking to a module over SPI, comparing card numbers, keeping a small list in EEPROM, and letting a mode close by itself. Install "MFRC522" from the Library Manager; Servo and EEPROM come with the Arduino IDE. This is a learning project; do not use it as a real door's only lock.Open project
• RFID Attendance (ESP32 + LCD)Intermediate40 minThe name of whoever scans their card appears on the LCD and is logged as "in" or "out"; the screen counts how many people are inside. For a club, class or workshop register: it shows the number of a card it does not know, and you add that number with a name to the list in the code. No breadboard needed; the RC522 and the LCD connect straight to the ESP32 with female-female wires.Open project