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[Olimex ESP-32 PoE] based.

 const uint8_t I2C_SDA_PIN = 13; //SDA;  // i2c SDA Pin
 const uint8_t I2C_SCL_PIN = 16; //SCL;  // i2c SCL Pin

 const uint8_t oled_sd1306_i2c_addr = 0x3C;
 const uint8_t mfrc522_rfid_i2c_addr = 0x28;

 const uint8_t aart_led  (EXT2 onderaan)
 const uint8_t pusbutton