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53 lines
1.7 KiB
ReStructuredText
53 lines
1.7 KiB
ReStructuredText
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.. _one_wire:
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1-Wire Bus
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==========
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.. seo::
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:description: Instructions for setting up a Dallas (Analog Devices) 1-Wire bus to communicate with 1-wire devices in ESPHome
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:image: one-wire.svg
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:keywords: Dallas, onewire, 1-wire
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The ``one_wire`` component allows you to use supported 1-Wire devices in ESPHome.
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The 1-Wire bus the devices are connected to should have an external pullup resistor of
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about 4.7KΩ. For this, connect a resistor of *about* 4.7KΩ between ``3.3V``
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and the data pin. Values ± 1KΩ will, in most cases, work fine as well,
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if you don't have massively long wires.
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GPIO
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----
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The ``gpio`` platform uses the CPU to generate the bus signals on a GPIO pin.
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.. code-block:: yaml
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# Example configuration entry
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one_wire:
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- platform: gpio
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pin: GPIOXX
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Configuration variables:
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************************
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- **pin** (**Required**, number): The pin the sensor bus is connected to. Please note that 1-wire is a bi-directional bus so it requires both input and output from the pin.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation. Required if you have multiple busses.
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Getting Sensor IDs
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******************
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In order to find the addresses, simply start the firmware on your
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device with a configured one_wire hub and observe the log output.
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Note that you don't need to define the individual sensors just yet, as
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the scanning will happen even with no sensors configured.
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For example, you will see something like this:
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.. figure:: images/dallas-log.png
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See Also
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--------
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- :apiref:`one_wire/one_wire_bus.h`
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- :ghedit:`Edit`
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- `Guidelines for Reliable Long Line 1-Wire Networks <https://www.analog.com/en/technical-articles/guidelines-for-reliable-long-line-1wire-networks.html>`__
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