How do I connect the MFRC522 RFID module to my host machine? (Shenzhen MFRC522 RFID Module User Manual)

Answer

manuals.plus

Jan 31, 2025 - 02:17 AM

To connect the MFRC522 RFID module to your host machine, you have three options: SPI, I2C, or UART.

1. SPI Mode:
- Connect the 3V3 pin of the module to the power supply (3.3V).
- Connect the RST pin to a reset and power-down input.
- Connect the GND pin to ground.
- Connect the IRQ pin if you want to use the interrupt warning feature.
- Connect the MISO pin to the SPI master in, slave out pin of your host machine.
- Connect the MOSI pin to the SPI master out, slave in pin of your host machine.
- Connect the SCK pin to the SPI serial clock input pin of your host machine.
- Connect the SDA pin to the input/output pin of your host machine.

2. I2C Mode:
- Connect the 3V3 pin of the module to the power supply (3.3V).
- Connect the RST pin to a reset and power-down input.
- Connect the GND pin to ground.
- Connect the IRQ pin if you want to use the interrupt warning feature.
- Connect the SDA pin to the serial data line input/output pin of your host machine.
- Connect the SCK pin to the serial clock pin of your host machine.

3. UART Mode:
- Connect the 3V3 pin of the module to the power supply (3.3V).
- Connect the RST pin to a reset and power-down input.
- Connect the GND pin to ground.
- Connect the IRQ pin if you want to use the interrupt warning feature.
- Connect the MISO pin to the serial data output pin of your host machine.
- Connect the SDA pin to the serial input port of your host machine.

Please refer to the pinning information and schematic provided in the user manual for more details on the pin connections.

Note: Make sure to follow the instructions carefully and consult the manual or seek assistance from a professional if needed to ensure proper connection and operation of the MFRC522 RFID module.