Raspberry Pi Pico Learning Kit Lesson 7: Using SPI port to access RFID reader
RFID reader is a very popular device in security system. It can read the ID of an RFID card and send it to computer system.
In this lesson, we will use OSOYOO RFID reader to make a simple security verify system. This RFID will use a new communication protocol SPI to send data to Pico. So after this lesson, you have learned three kind of communication protocols: SPI, I2C and Serial (RS232).