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[Olimex ESP-32 PoE] based.

Wiring

 const uint8_t I2C_SDA_PIN = 13; //SDA;  // i2c SDA Pin, ext 2, pin 10
 const uint8_t I2C_SCL_PIN = 16; //SCL;  // i2c SCL Pin, ext 2, pin 7
 const uint8_t oled_sd1306_i2c_addr = 0x3C;
 const uint8_t mfrc522_rfid_i2c_addr = 0x28;
 const uint8_t mfrc522_rfid_i2c_irq = 4;  // Ext1, pin 10
 const uint8_t mfrc522_rfid_i2c_reset = 5; // Ext1, pin 9
 const uint8_t aart_led  15 // Ext 2, pin 8)
 const uint8_t pusbutton  0 // Ext 1, pin 6