The SS pin is a chip enable pin in SPI communication. The SCK pins help to send the clock pulse in SPI communications. MOSI is the data input pin for RFID module in SPI communication It can also interface with I2C for clock pulse and UART Serial for Data transfer from the module.
The MISO pin is also useable for other functions instead of SPI. However, it transfers the data from module to Arduino. This pin connects with the Arduino/Microcontrollers for SPI communication. The device can go into sleep mode to save power. power Supply, Microcontroller or Arduino. Ground helps to make the common ground with every external device, e.g. Therefore, it uses to reset the device in case of an error on when a device isn’t giving any response. In some versions of RC522, this pin is denoted by 3V3 on the module instead of VCC. RC522 Pinout DiagramĪll the pins of MFRC/RC522 RFID card Reader are:
The onboard microcontroller won’t make the module a stand-alone device. Therefore, the device may have its microcontroller chip on itself but it only makes it to works as an RFID. So, the first one is power and the second one is the communication pins. In this module, there are only two kinds of pins. In most of the security and commercial products, the module is effective because the errors and issues with RFID Tags are detectable by it. The RFID cards communicate with the module at a short distance with radio frequency due to the mutual induction technique.
The RC522 module works on 13.56 MHz frequency and it can act as a reader and write for UID/RFID cards. The module allows the developers to interface it with any other SPI, I2C, and UART based microcontrollers. The RC522 is known as MFRC-522 due to its NFX semiconductor microcontroller. RC522 is a Multi-communication RFID Module for Arduino and Microcontrollers.
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