M5Stack® Mini RFID Module RC522 Module Sensor for Arduino SPI Writer Reader IC Card with Grove Port I2C Interface for ESP32
Description:
RFID has an RFID chip MFRC522 inside.
The MFRC522 operates in the 13.56MHz frequency band and uses the modulation and demodulation principle to interact with the proximity RF card. This unit can realize the function of the card reading and writing device, to identify and re cord multiple card information, to encode and authority a RF card.
It is able tp establish applications such as access control system, punching system, warehouse goods storage and community vehicle access registration.
Connect this Unit to GROVE PORTA on M5Core, IIC adress is 0x28. 
Product Features:
- Operating frequency: 13.56 MHz
- I2C data rate: Fast mode: up to 400 Kbit/s; High-speed mode: up to 3400 Kbit/s
- RC522 Transceiver Buffer: 64 bytes
- Supported protocol: ISO14443A, MIFARE and NTAG
- Operate temperature: -20℃-85℃
- How long data be saved for: > 10 years
- Reading and writing distance: < 8 cm
- Program Platform: Arduino, UIFlow(Blockly, Python)
- Two Le go installation holes
- Product Size: 48.2mm x 24.2mm x 8.3mm
- Product weight: 5.9g
Package Included:
- 1x RFID unit
- 1x GROVE Cable
Application:
- Smart home access control system
- Vehicle management
- Smart transportation
- Smart bookshelf
Related Link:
Datasheet - MFRC522
EasyLoader
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2.After downloading the software, double-click to run the application, connect the M5 device to the computer through the data cable, select the port parameters, click "Burn" to start burning. (For M5StickC burning, please Set the baud rate to 750000 or 115200)
3. Currently EasyLoader is only suitable for Windows operating system, compatible with M5 system adopts ESP32 as the control core host. Before installing for M5Core, you need to install CP210X driver (you do not need to install with M5StickC as controller)Click here to view the driver installation tutorial
Example;
1. for Arduino IDE
The code below is incomplete. To get complete code, please click here.
After programming the RFID.ino, the IC card or the mobile phone NFC, close to the unit, moves back and forth around the unit, and the UID of the IC card or the RFID chip in the mobile phone will be printed on the screen of the M5Core.
2. UIFlow
To get complete code, please click here.
After opening and burning this example using UIFlow, place the proximity card on the Unit surface and the screen displays 
Schematic:
PinMap:
| M5Core ( GROVE A ) | GPIO22 | GPIO21 | 5V | GND |
| RFID Unit | SCL | SDA | 5V | GND |
