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Wide 1-Wire Temperature Sensors Reliable Network
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================================================
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.. seo::
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:description: Instructions for setting up a wide and reliable
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temperature sensors network. For this we use components of the
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familly ds248x like ds2482-100 or ds2482-800 that are single channel ou octo channels 1-Wire Master interface
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chips over I²C.
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:keywords: ds2484 ds2482-100, ds2482-800, ds18b20, onewire
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.. _ds248x-component:
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Component/Hub
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-------------
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The ``ds248x`` component allows you to build
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wide and reliable 1-Wire temperature sensors network.
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It controls chips of the ds248x familly like :
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- `ds2484 <https://www.tindie.com/products/closedcube/ds2484-i2c-to-1-channel-onewire-master-breakout/>`__
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(`datasheet <https://www.analog.com/media/en/technical-documentation/data-sheets/DS2484.pdf>`__)
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- `ds2482-100 <https://www.artekit.eu/products/breakout-boards/io/ak-ds2482s-100/>`__
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(`datasheet <https://www.analog.com/media/en/technical-documentation/data-sheets/DS2482-100.pdf>`__)
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- `ds2482-800 <https://www.tindie.com/products/closedcube/ds2482-800-i2c-to-8-channel-1-wire-breakout-board/>`__
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(`datasheet <https://www.analog.com/media/en/technical-documentation/data-sheets/ds2482-800.pdf>`__)
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To build a large and reliable 1-Wire network, a certain number of constraints must be respected.
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This `document <https://www.analog.com/en/resources/technical-articles/guidelines-for-reliable-long-line-1wire-networks.html>`__ covers the subject.
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My advice is as follows :
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- Use category 7 network cable.
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- For each 1-Wire bus, use linear network topology.
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- Don't use parasite powering.
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- Use 5V vcc to power the 1-Wire components.
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- Use a Master 1-Wire component to fine control timings on the 1-Wire buses.
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If you cannot use a linear network topology, consider user ds2482-800, so you have height 1-Wire buses to build a star + linear network topology.
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If you dont use ds2484, use a level translator like
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`pca9306 <https://www.dhm-online.com/fr/sparkfun/3084-sparkfun-level-translator-breakout-pca9306.html>`__
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(`datasheet <https://www.ti.com/lit/ds/symlink/pca9306.pdf>`__).
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First set a I²C bus:
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--------------------
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.. code-block:: yaml
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# I²C Bus
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i2c:
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sda: GPIO13 # set your i2c pins
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scl: GPIO16 # set your i2c pins
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frequency: 400kHz # 400 is the maximum the ds248x supports
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For more informations, see :doc:`/components/i2c`.
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Configure the component:
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------------------------
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.. code-block:: yaml
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# ds2482-800
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ds248x:
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type: ds2482-800
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address: 0x1f
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active_pullup: true
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strong_pullup: false
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bus_sleep: false
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update_interval: 10s
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Configuration variables:
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************************
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- **type** (**Required**, enum): Can be ``ds2482-100`` or ``ds2482-800``.
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- **address** (*Optional*, int): Manually specify the I²C address of the component.
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Defaults to ``0x18``.
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- **sleep_pin** (*Optional*, :ref:`Pin <config-pin>`): ``ds2484`` support Power-Saving Sleep Mode (SLPZ Pin).
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If set the ``ds248x`` sleeps when no transaction is in progress.
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- **bus_sleep** (*Optional*, boolean): ``ds2484`` support 1-Wire Power Down.
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Set to true to control.
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Defaults to false.
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- **hub_sleep** (*Optional*, boolean): Defaults to false.
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- **active_pullup** (*Optional*, boolean): Adds an active pullup which should improve signal integrity.
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Defaults to false.
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- **strong_pullup** (*Optional*, boolean): Enables a strong pullup used to provide the needed current
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for temperature reading without vcc connected (parasite powering).
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Defaults to false.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval that the sensors should be checked.
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Defaults to 60 seconds.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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Sensors
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-------
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.. _ds248x-sensor:
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The ``ds248x`` hub allows you to use DS18B20 and similar sensors.
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To initialize a sensor, first supply either ``address`` **or** ``index`` to identify the sensor.
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.. figure:: images/dallas-wired.jpg
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:align: center
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:width: 50.0%
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Wired Version of the DS18B20 1-Wire Temperature Sensor.
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.. _Adafruit: https://www.adafruit.com/product/374
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.. figure:: images/temperature.png
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:align: center
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:width: 80.0%
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.. code-block:: yaml
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sensor:
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- platform: ds248x
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address: 0x80000002a5fea828
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channel: 0
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name: "Livingroom Temperature"
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resolution: 12
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Configuration variables:
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************************
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- **address** (**Required**, int): The address of the sensor. Use either
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this option or index.
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- **index** (**Required**, int): The index of the sensor starting with 0.
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So the first sensor will for example have index 0. :ref:`It’s recommended
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to use address instead <ds248x-getting-ids>`.
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- **channel** (*Optional*, int): An optional 1-Wire channel (ds2482-800 has height channels) from 0 to 7.
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Defaults to 0.
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- **resolution** (*Optional*, int): An optional resolution from 9 to
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12. Higher means more accurate. Defaults to the maximum for most Dallas temperature sensors: 12.
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- **dallas_id** (*Optional*, :ref:`config-id`): The ID of the :ref:`ds248x hub <ds248x-component>`.
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Use this if you have multiple dallas hubs.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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- All other options from :ref:`Sensor <config-sensor>`.
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.. _ds248x-getting-ids:
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Getting Sensor IDs
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******************
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It is highly recommended to use the ``address`` attribute for creating
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ds248x sensors, because if you have multiple sensors on a bus and the
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automatic sensor discovery fails, all sensors indices will be shifted by
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one. In order to get the address, simply start the firmware on your
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device with a configured ds248x hub and observe the log output (the :ref:`log
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level <logger-log_levels>` must be set to at least
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``debug``!). 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 connected. For example with this configuration:
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.. code-block:: yaml
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# Example without sensors
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ds248x:
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type: ds2482-800
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address: 0x1f
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active_pullup: true
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strong_pullup: false
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bus_sleep: false
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update_interval: 10s
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# Note you don't have to add any sensors at this point
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You will find something like this:
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.. figure:: images/ds248x-log.png
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Now we can add the individual sensors to our configuration:
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.. code-block:: yaml
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# Example with 2 sensors from the previous list
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ds248x:
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type: ds2482-800
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address: 0x1f
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active_pullup: true
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strong_pullup: false
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bus_sleep: false
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update_interval: 10s
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sensor:
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- platform: ds248x
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address: 0x80000002a5fea828
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channel: 0
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name: "Temperature #1"
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- platform: ds248x
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address: 0xf10000051c169828
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channel: 1
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name: "Temperature #2"
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# ...
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Next, individually warm up or cool down the sensors and observe the log again.
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You will see the outputted sensor values changing when they're being warmed.
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When you're finished mapping each address to a name, just change the ``Temperature #1``
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to your assigned names and you should be ready.
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Multiple ds248x hubs
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********************
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For example, on the ds2482-800, you can set the bits ``AD0``, ``AD1`` and ``AD2`` of the address of this I²C component.
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This give you height addresses from ``0x18`` to ``0X1F``.
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Use this if you have multiple ds248x hubs on your I²C bus:
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.. code-block:: yaml
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# Example configuration entry
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ds248x:
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- type: ds2482-800
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id: hub_1
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address: 0x18
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active_pullup: true
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strong_pullup: false
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bus_sleep: false
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update_interval: 10s
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- type: ds2482-800
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id: hub_2
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address: 0x19
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active_pullup: true
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strong_pullup: false
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bus_sleep: false
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update_interval: 10s
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sensor:
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- platform: ds248x
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dallas_id: hub_1
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# ...
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- platform: ds248x
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dallas_id: hub_2
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# ...
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See Also
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--------
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- :ref:`sensor-filters`
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- :doc:`max6675`
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- `Arduino DallasTemperature library <https://github.com/milesburton/Arduino-Temperature-Control-Library>`__
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by `Miles Burton <https://github.com/milesburton>`__
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- :apiref:`dallas/dallas_component.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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@ -385,6 +385,7 @@ Environmental
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BMP388 and BMP390, components/sensor/bmp3xx, bmp388.jpg, Temperature & Pressure
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BMP581, components/sensor/bmp581, bmp581.jpg, Temperature & Pressure
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Dallas DS18B20, components/sensor/dallas, dallas.jpg, Temperature
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ds248x, components/sensor/ds248x, ds248x.jpg, Temperature
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DHT, components/sensor/dht, dht.jpg, Temperature & Humidity
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DHT12, components/sensor/dht12, dht12.jpg, Temperature & Humidity
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DPS310, components/sensor/dps310, dps310.jpg, Temperature & Pressure
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