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+# MFRC522 i2c 
+### Code is compatible to Arduino and ESP8266 (NodeMCU)
+
+1. [Download and install following library from arozcan](https://github.com/semaf/MFRC522-I2C-Library)
+
+2. __Set the Pin for the RST and i2c address!__
+```c++
+#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.
+```