onewire platform supports sensors which are using the One wire (1-wire) bus for communication.
- DS28EA00 temperature sensors
- DS2406/TAI-8570 Temperature and pressure sensor made by AAG
- DS2438/B1-R1-A Temperature, pressure and humidity sensor by AAG
The 1-Wire bus can be connected directly to the IO pins of Raspberry Pi or using dedicated interface adapter (e.g DS9490R).
Raspberry Pi setup
In order to setup 1-Wire support on Raspberry Pi, you’ll need to edit
/boot/config.txt following this documentation. Don’t use the
Interface adapter setup
When an interface adapter is used, sensors can be accessed on Linux hosts via owfs 1-Wire file system. When using an interface adapter and the owfs, the
mount_dir option must be configured to correspond a directory, where owfs device tree has been mounted.
This component has been modified to work with devices with multiple sensors which will cause a discontinuity in recorded values. Existing devices will receive a new ID and therefore show up as new devices.
If you wish to maintain continuity it can be resolved in the database by renaming the old devices to the new names.
Connect to your database using the instructions from home-assistant.io/docs/backend/database/. Check the names of sensors:
SELECT entity_id, COUNT(*) as count FROM states GROUP BY entity_id ORDER BY count DESC LIMIT 10;
Alter the names of sensors using the following examples:
UPDATE states SET entity_id='sensor.<sensor_name>_temperature' WHERE entity_id LIKE 'sensor.<sensor_name>%' AND attributes LIKE '%\u00b0C%';
UPDATE states SET entity_id='sensor.<sensor_name>_pressure' WHERE entity_id LIKE 'sensor.<sensor_name>%' AND attributes LIKE '%mb%';
UPDATE states SET entity_id='sensor.<sensor_name>_humidity' WHERE entity_id LIKE 'sensor.<sensor_name>%' AND attributes LIKE '%%%' ESCAPE '';
Remember to replace
<sensor_name> with the actual name of the sensor as seen in the
Home Assistant setup
To enable One wire sensors in your installation, add the following to your
# Example configuration.yaml entry sensor: - platform: onewire names: some_id: your name
- names array (Optional): ID and friendly name of your sensors.
- mount_dir (Optional): Location of device tree if owfs driver used.