Q
I have selected the I2C in the Hardware Configuration but when I transmit data nothing is visible on this pins.
A
If you are using our driver it is most likely, that the external circuit does not create a valid I2C bus.
In the I2C specification in chapter "7. Electrical connections of I2C-bus devices to the bus lines" you are able to find further informations on this topic.
Typical the pull up resistance is 10 kΩ for 100 kHz and 2 kΩ for 400 kHz
A basic circuit is:
See also...