home-assistant.io/source/_components/sensor.onewire.markdown

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layout	title	description	date	sidebar	comments	sharing	footer	logo	ha_category	ha_release	ha_iot_class
page	One wire Sensor	Instructions on how to integrate One wire (1-wire) sensors into Home Assistant.	2017-09-15 10:10	true	false	true	true	onewire.png	DIY	0.12	Local Polling

The onewire platform supports sensors which are using the One wire (1-wire) bus for communication.

Supported devices:

• DS18B20
• DS18S20
• DS1822
• DS1825
• 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).

{% linkable_title Raspberry Pi setup %}

In order to setup 1-Wire support on Raspberry Pi, you'll need to edit /boot/config.txt following this documentation. To edit /boot/config.txt on Hass.io use this documentation to enable SSH and edit /mnt/boot/config.txt via vi.

{% linkable_title Interface adapter setup %}

{% linkable_title owfs %}

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.

{% linkable_title Units with multiple sensors %}

This platform works 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 Database section. 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 SELECT query.

{% linkable_title Configuration %}

To enable One wire sensors in your installation, add the following to your configuration.yaml file:

# Example configuration.yaml entry
sensor:
  - platform: onewire
    names:
      some_id: your name

{% configuration %} names: description: ID and friendly name of your sensors. required: false type: string mount_dir: description: Location of device tree if owfs driver used. required: false type: string {% endconfiguration %}