![]() In some companies, the devices use with shopping items. ![]() RFID has most of the usage as a security device.The RFID cards and reader (RC522) can transfer data up to 10Mb/s.Therefore, it is useable with almost every microcontroller or device in the market. The module has three kinds of communications (UART, SPI, I2C).Its auto-sleep mode makes it less power consumption module.The only 3.3V is required to activate the device.The RFID Cards are useable from both sides of the module at max 5cm.RFID RC522 uses mutual induction to activate the cards and 13.56MHz for data transfer.It also receives data during UART communication. The SS pin in RFID is useable as a second pin (SDA) for I2C communication. Therefore, it receives the signal when Master (Arduino) must perform SPI communication. 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.
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