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The Arduino IDE requires the sketch folder name to match the filename of the primary sketch file. On a filename case-sensitive OS like Linux, this includes matching case. This change causes the example sketch to be accessible via the Arduino IDE's File > Examples > LIBRARYNAME menu after the library is installed.

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README.md

MFRC522 i2c

Code is compatible to Arduino and ESP8266 (NodeMCU)

Tested on https://electronics.semaf.at/MFRC522-i2c-Tiny-Breakout-Board

Set the Pin for the RST and i2c address!

#define RST_PIN 6 // Arduino UNO
// #define RST_PIN 14 // D5 on NodeMCU

// 0x28 is i2c address of the NFC Reader. Check your address with i2cscanner if not match.
MFRC522 mfrc522(0x28, RST_PIN);   // Create MFRC522 instance.

Thanks to @arozcan for the MFRC522 i2c Library