Enabling The I2C Port
Via the desktop GUI
In the desktop GUI select the Start button > Preferences > Raspberry Pi Configuration
Select the interfaces tab and then select the relevant option.
Via the config file
Use the sudo raspi-config
config tool:
sudo raspi-config
Select ‘Interface Options’ and then select the relevant option.

9 years ago
With latest Jessie release, the raspi-config menu option is 5 Interfacing Options for enabling I2C, not 7 Advanced options.
10 years ago
If I attach a Sense HAT to the pi, can I still use I2C? Thank you.