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home-assistant.io/source/hassio/enable_i2c.markdown
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Enable i2c on the Home Assistant Operating System Instructions on how to enable I2C on a Raspberry PI

Home Assistant using the Home Assistant Operating System, is a managed environment. Which means you can't use existing methods to enable the I2C bus on a Raspberry Pi.

If you're attempting to add an external sensor, you will have to enable the I2C interface in the Home Assistant configuration using a USB stick.

Step by step instructions

You will need:

  • USB drive
  • A way to add files to the USB drive
  • A way to connect the drive to your Raspberry Pi

Step 1 - Prepare the USB drive

Connect the USB drive to a device capable of adding and editing files to the USB drive.

Format a USB stick with FAT32/EXT4/NTFS and name the drive CONFIG (uppercase).

Step 2 - Add files to enable I2C

  • In the root of the USB drive add a folder called /modules.
  • Inside that folder add a text file called rpi-i2c.conf with the following contents: 
    i2c-bcm2708
i2c-dev
  • In the root of the USB drive add a file called config.txt with the following contents: 
    dtparam=i2c1=on 
dtparam=i2c_arm=on

Step 3 - Load the new USB configuration

  • Insert the USB drive into your Raspberry Pi.
  • Now go to your Home Assistant web interface, in the sidebar click Supervisor > System.
  • Now click Import from USB.
  • This will restart your Home Assistant instance, and load the new USB configuration.

When the service has restarted, you will have a working I2C interface.