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 how to integrate One wire (1-wire) sensors into Home Assistant.	2016-01-17 07:15	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

The 1-Wire bus can be connected directly to the IO pins of Raspberry Pi or using dedicated interface adapter (e.g DS9490R). 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. If you are using Raspberry Pi and IO pin connected bus setup, don't use the 'mount_dir' option.

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 variables:

• names array (Optional): ID and friendly name of your sensors.
• mount_dir (Optional): Location of device tree if owfs driver used.