This is a spin-off from the original Home Assistant integration, which was removed in Home Assistant Core version 2022.6.
NOTE: This integration does not support connection via owserver owfs 1-Wire file system. For connection via owserver, use Home Assistant 1-Wire integration, both integrations can be used at the same time.
The onewire_sysbus integration supports sensors which that using the One wire (1-wire) bus for communication.
Every 1-wire device has a (globally) unique ID that identifies the device on the bus. The first two digits identify a device family and the last 14 digits are a globally unique number given to it during manufacturing.
Different families have different functionality and can measure different quantities.
Each 1-wire component data sheet describes the different properties the component provides.
The recommend way to install onewire_sysbus is through HACS.
After installation restart Home Assistant and add the integration:
Navigate to Settings --> Devices & Services --> ADD INTEGRATION and select the 1-Wire SysBus integration.
Copy the onewire_sysbus folder and all of its contents into your Home Assistant's custom_components folder. This folder is usually inside your /config folder. If you are running Hass.io, use SAMBA to copy the folder over. You may need to create the custom_components folder and then copy the onewire_sysbus folder and all of its contents into it.
After installation restart Home Assistant and add the integration:
Navigate to Settings --> Devices & Services --> ADD INTEGRATION and select the 1-Wire SysBus integration.
| Family | Device | Physical Quantity |
|---|---|---|
| 10 | DS18S20 | Temperature |
| 22 | DS1822 | Temperature |
| 28 | DS18B20 | Temperature |
| 3B | DS1825 | Temperature |
| 42 | DS28EA00 | Temperature |
The 1-Wire bus can be connected directly to the IO pins of Raspberry Pi or by using a dedicated interface adapter, for example DS9490R or adapters based on DS2482-100 that can be directly attached to the IO pins on the Raspberry Pi.
In order to setup 1-Wire support on Raspberry Pi, you'll need to edit /boot/config.txt. This file can not be edited through ssh. You have to put your SD card to a PC, and edit the file directly.
To edit /boot/config.txt on the Home Assistant Operating System, use this documentation to enable SSH and edit /mnt/boot/config.txt via vi.
If you use an external pull-up resistor and the default GPIO 4 for the data line, add the following line:
dtoverlay=w1-gpioIf you don't want to use an external resistor, you can use a built-in one using the following line:
dtoverlay=w1-gpio-pullupIt is also possible to use a different GPIO pin like this to change it to pin 15:
dtoverlay=w1-gpio-pullup,gpiopin=15Furthermore, it is also possible to have multiple GPIOs as one-wire data channel by adding multiple lines like this:
dtoverlay=w1-gpio-pullup,gpiopin=15
dtoverlay=w1-gpio-pullup,gpiopin=16You can read about further parameters in this documentation: Raspberry Pi Tutorial Series: 1-Wire DS18B20 Sensor.
When using the GPIO pins on Raspberry Pi directly as a 1-wire bus, the description above uses two kernel modules. 1w_gpio, that implements the 1-wire protocol, and 1w_therm, that understands the DS18B20 (family 28) components inner structure and reports temperature.
There is no support for other device types (families) and hence this onewire platform only supports temperature measurements from family 28 devices.
If you set up ssh, you can check the connected one-wire devices in the following folder: /sys/bus/w1/devices
The device IDs begin with 28-.
Upon startup of the platform, the 1-wire bus is searched for available 1-wire devices creates entities based on the sensor unique id:
sensor.28.FF5C68521604_temperature