Introduction - If you have any usage issues, please Google them yourself
MFRC522 serial communication 1. Hardware will I2C, EA then low .2, SDA then CPU' s TXD, D7 CPU then the RXD. Will have access to come in 3.3V power supply. Transceiver to the serial SPI software will send and receive, and the serial output register addresses to 00XXXXXXb, 10XXXXXXb format. communication baud rate with default 9600.