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Working with 1-Wire temperature sensors in Home Assistant Core

To work with DS18B20 1-Wire temperature sensors in the Home Assistant Core, there is a standard “1-Wire” add-on that can be installed through the Home Assistant web interface. When setting up the 1-Wire add-on, you will be offered two options for working with the 1-Wire bus:

  • OWServer
  • sysbus

The SysBus option is not recommended, as SysBus support will be removed starting with Home Assistant Core 2022.6.

For more details, see the documentation: 1-Wire - Home Assistant

To use OWServer on the controller, you must install and configure the owserver service.

Installing OWServer

To install the owserver service, just run the command:

 sudo apt install owserver

Setting up OWServer

By default, the owserver service starts with test "fake" 1-Wire devices that need to be disabled and enabled to work with 1-Wire sensors connected to the processor GPIO.

Open the configuration file /etc/owfs.conf

 sudo nano /etc/owfs.conf

Find and comment out the line:

 ...
#server: FAKE = DS18S20,DS2405
...

Add a line to the file:

 server: w1

Now the configuration file should contain the following lines:

 ...
server: w1
server:port=localhost:4304
...

Restart the owserver service:

 sudo systemctl restart owserver.service

Setting up the 1-Wire add-on in Home Assistant

When setting up the 1-Wire add-on in Home Assistant, select the OWServer option and leave the default server settings:

  • Server: localhost
  • Port: 4304

After installing the 1-Wire add-on, the temperature sensors connected to the controller should appear in the list of Home Assistant devices.