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47 lines
1.6 KiB
Markdown
47 lines
1.6 KiB
Markdown
---
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title: "Enable i2c on the Home Assistant Operating System"
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description: "Instructions on how to enable I2C on a Raspberry PI"
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---
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Home Assistant using the Home Assistant Operating System, is a managed environment.
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Which means you can't use existing methods to enable the I2C bus on a Raspberry Pi.
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If you're attempting to add an external sensor, you will have to [enable the I2C interface in the Home Assistant configuration](https://github.com/home-assistant/hassos/blob/dev/Documentation/boards/raspberrypi.md#i2c) using a USB stick.
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## Step by step instructions
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You will need:
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- USB drive
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- A way to add files to the USB drive
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- A way to connect the drive to your Raspberry Pi
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### Step 1 - Prepare the USB drive
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Connect the USB drive to a device capable of adding and editing files to the USB drive.
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Format a USB stick with FAT32/EXT4/NTFS and name the drive `CONFIG` (uppercase).
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### Step 2 - Add files to enable I2C
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- In the root of the USB drive add a folder called `/modules`.
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- Inside that folder add a text file called `rpi-i2c.conf` with the following contents:
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```txt
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i2c-bcm2708
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i2c-dev
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```
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- In the root of the USB drive add a file called `config.txt` with the following contents:
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```txt
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dtparam=i2c1=on
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dtparam=i2c_arm=on
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```
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### Step 3 - Load the new USB configuration
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- Insert the USB drive into your Raspberry Pi.
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- Now go to your Home Assistant web interface, in the sidebar click **Supervisor** > **System**.
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- Now click `Import from USB`.
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- This will restart your Home Assistant instance, and load the new USB configuration.
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When the service has restarted, you will have a working I2C interface.
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