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The library is the industry-standard driver for the RC522 RFID module, allowing developers to read and write data to 13.56MHz contactless smart cards (like MIFARE Classic 1K). To begin your project, you can download the official MFRC522 GitHub library or install it directly via the Arduino IDE Library Manager. How to Download and Install the Library There are two primary ways to set up your environment: Arduino Library Manager (Recommended): Open the Arduino IDE.