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home-assistant.io/source/hassio/enable_i2c.markdown
ctborg 08fad39c0c Adds docs for enabling I2C on Hass.io (#8144) 
* Create enable_i2c.markdown

* Update sensor.bme680.markdown

* Update hassio_navigation.html

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2019-02-27 10:17:03 +01:00

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page Enable HassOS i2c Instructions on how to enable I2C on a Raspberry PI for Hass.io. 2018-01-11 20:08 true false true true

Hass.io 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 Hass.io configuration using a USB stick.

{% linkable_title 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

{% linkable_title 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).

{% linkable_title 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

{% linkable_title Step 3 - Load the new USB config %}

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

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