RFID-RC522 13.56 MHz Reader + Cards
by NXP clone
SKU: PSA-CMP-RC522
No reviews yetTypical India street price
₹90–₹180
Tap MIFARE tokens for attendance, lockers, and inventory.
Interface: SPI
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Concept
RFID: reader field powers a passive tag; they exchange an ID.
A little theory
13.56 MHz ISO14443A. RC522 analog front-end + SPI to MCU. In the classroom, treat RFID-RC522 13.56 MHz Reader + Cards as a intermediate part using SPI. Typical India street price is about ₹90–₹180. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Wire SPI, use MFRC522 library, print UID on tap. Store UIDs for access control.
Classroom & project use
- Attendance
- Door lock
- Library book demo
Buying in India
Precautions
- Logic is 3.3 V — don’t drive SDA/SCK from 5 V without a shifter on strict boards
- Share a common GND with the microcontroller
Specifications
| Frequency | 13.56 MHz |
| Range | ~3 cm |
| Bus | SPI |
| Category | Sensors |
| Difficulty | Intermediate |
| Voltage | 3.3V (some boards 5V VCC) |
| Interface | SPI |
Pinout
SDA(SS) | SCK | MOSI | MISO | IRQ | GND | RST | 3.3V
