Writing and reading from NFC tag type 2 (NT3H2111_2211)

[Nuramon]

Hello everybody,
I have problem to write and read data from NFC tag type 2 (NT3H2111_2211) by Arduino UNO using I2C bus. This is my code for Arduino:

Code: Select all

void loop()
{
  // Read sensor values (16 bit integers)
  unsigned int red = RGB_sensor.readRed();
  unsigned int green = RGB_sensor.readGreen();
  unsigned int blue = RGB_sensor.readBlue();

  // Print out readings
  Serial.print("Red: "); Serial.println(red, HEX);
  Serial.print("Green: "); Serial.println(green, HEX);
  Serial.print("Blue: "); Serial.println(blue, HEX);
  Serial.println();
    
  Wire.beginTransmission(85); // transmit to device #85
  Wire.write(0); 
  Wire.write(red);
  Wire.write(red>>8); 
  Wire.endTransmission(true);      // stop transmitting

  delay(10);
  unsigned int data = 0x0000;

  Wire.beginTransmission(85);//checking if transmission was succesful
  Wire.write(0);
  Wire.endTransmission(false);
  Wire.requestFrom(85,1,true);    
  data = Wire.read();
     
  Serial.println(data, HEX);   //number should be same as "Red"
  Serial.println();

  delay(2000);
}

The respond is "FFFF". Could anybody give me a hint where the problem can be?
Thank you.