RFID Reader Module
Component Technical Specifications
An RFID Reader Module (like the RC522) allows microcontrollers to read data from tags or cards wirelessly via Radio Frequency Identification. Operating at 13.56 MHz, it uses an electromagnetic field to power and communicate with passive tags within a short range (typically 3–5 cm).
The module usually communicates via the SPI protocol, requiring pins for MISO, MOSI, SCK, and SDA. It is widely used for security systems, automated attendance, and inventory tracking. Since each RFID tag has a unique UID, it serves as a secure "digital key" for projects involving electronic door locks or user authentication.
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