178 lines
7.1 KiB
ReStructuredText
178 lines
7.1 KiB
ReStructuredText
.. _nextion_sensor:
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Nextion Sensor Component
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========================
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.. seo::
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:description: Instructions for setting up Nextion sensor.
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:image: nextion.jpg
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The ``nextion`` sensor platform supports integers or floats (Xfloat). It can be a component, a variable or a waveform in the Nextion display.
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It is best to set the component's vscope to global in the Nextion Editor. This way the component will be available
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if the page is shown or not.
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.. note::
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The Nextion can receive an integer but it can only send 3 bytes for a negative integer. The range if using the :ref:`nextion_custom_sensor_protocol` is:
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-16777215 to 4294967295
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See :doc:`/components/display/nextion` for setting up the display
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.. code-block:: yaml
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# Example configuration entry
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display:
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- platform: nextion
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id: nextion1
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# ...
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sensor:
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- platform: nextion
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name: "Current Humidity"
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component_name: humidity # pageX.humidity for a global
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precision: 1
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update_interval: 4s
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- platform: nextion
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nextion_id: nextion1
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name: "Current Temperature"
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variable_name: temperature
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- platform: nextion
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id: s01
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component_id: 2
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wave_channel_id: 0
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wave_max_value: 100
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waveform_send_last_value: "true"
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wave_max_length: 400
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update_interval: 1s
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- platform: nextion
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id: s02
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component_id: 2
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wave_channel_id: 1
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wave_max_value: 100
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update_interval: 1s
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Configuration variables:
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------------------------
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- **name** (**Required**, string): The name of the sensor.
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- **nextion_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the Nextion display.
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- **component_name** (*Optional*, string): Manually specify the name of the Nextion component.
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- **variable_name** (*Optional*, string): Manually specify the name of the Nextion variable.
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- **update_interval** (*Optional*, :ref:`config-time`): The duration to update the sensor
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- **precision** (*Optional*, int): This is for Nextion float components. This sets
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the precision that the component is set to. This typically is the ``vvs1`` setting of the component.
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- **background_color** (*Optional*, :ref:`config-color`): The background color
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- **foreground_color** (*Optional*, :ref:`config-color`): The foreground color
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- **visible** (*Optional*, boolean): Visible or not
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Waveform Settings
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*****************
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- **wave_channel_id** (*Optional*, int): The waveform ID in a range of 0-3
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- **wave_max_value** (*Optional*, int): The max value. Set ``dis`` to the height of the component in the Nextion editor
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and this to the max value that will be sent. This will set up the proper scaling.
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- **waveform_send_last_value** (*Optional*, int): This will send the last value set during an update interval. Setting to true will give a timeseries style graph
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- **wave_max_length** (*Optional*, int): How many data points to store. Typically this is the width of the component in the Nextion
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- **update_interval** (*Optional*, :ref:`config-time`): The duration to update the sensor. This typically should be set for waveforms to send periodic updates.
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- All other options from :ref:`Sensor <config-sensor>`.
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**Only one** *component_name* **or** *variable_name* **can be set**
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.. note::
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``background_color`` , ``foreground_color`` and ``visible`` do not retain their state on page change. :ref:`Sensor Settings<nextion_sensor_settings>`.
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A :ref:`Nextion Sensor <nextion_sensor>` with a custom protocol sending the current page can be used to execute the API call :ref:`Update Components By Prefix <update_components_by_prefix>` to update all the components for that page
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See :ref:`nextion_sensor_how_things_update` for additional information
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Globals
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*******
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The Nextion does not retain data on Nextion page changes. Additionally if a page is changed and the **component_name** does not exist on that page then
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nothing will be updated. To get around this the Nextion components can be changed to have a vscope of ``global``. If this is set then the **component_name**
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should be prefixed with the page name (page0/page1 or whatever you have changed it to).
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*Example*
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``component_name: page0.humidity``
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.. _nextion_sensor_lambda_calls:
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Lambda Calls
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************
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From :ref:`lambdas <config-lambda>`, you can call several methods to access
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some more advanced functions (see the full :apiref:`nextion/sensor/nextion_sensor.h` for more info).
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.. _nextion_sensor_set_state:
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- ``set_state(bool value, bool publish, bool send_to_nextion)``: Set the state to **value**. Publish the new state to HASS. Send_to_Nextion is to publish the state to the Nextion.
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.. _nextion_sensor_update:
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- ``update()``: Poll from the Nextion
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.. _nextion_sensor_settings:
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- ``set_background_color(Color color)``: Sets the background color to **Color**
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- ``set_foreground_color(Color color)``: Sets the background color to **Color**
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- ``set_visible(bool visible)`` : Sets visible or not. If set to false, no updates will be sent to the component
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.. _nextion_sensor_how_things_update:
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How things Update
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-----------------
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A Nextion component with an integer value (.val) or Nextion variable will be automatically polled if **update_interval** is set.
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To have the Nextion send the data you can use the :ref:`nextion_custom_sensor_protocol` for this. Add the :ref:`nextion_custom_sensor_protocol` to the
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component or function you want to trigger the send. Typically this is in *Touch Press Event* but some components, like a slider, should have it
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set in the *Touch Release Event* to capture all the changes. Since this is a custom protocol it can be sent from anywhere (timers/functions/components)
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in the Nextion.
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.. note::
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There is no need to check the *Send Component ID* for the *Touch Press Event* or *Touch Release Event*
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since this will be sending the real value to esphome.
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Using the above yaml example:
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- "Current Humidity" will poll the Nextion for the ``humidity.val`` value and set the sensor accordingly.
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- "Current Temperature" will NOT poll the Nextion. Either the Nextion will need to use the :ref:`nextion_custom_sensor_protocol` or use a lambda:
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- :ref:`Lambda Calls <nextion_sensor_lambda_calls>`.
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.. note::
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No updates will be sent to the Nextion if it is sleeping. Once it wakes, the components will be updated. If a component is invisible, :code:`visible(false)`, then it won't update until it is set to be visible.
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.. _nextion_custom_sensor_protocol:
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Nextion Custom Sensor Protocol
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------------------------------
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All lines are required
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.. code-block:: c++
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printh 91
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prints "temperature",0
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printh 00
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prints temperature.val,0
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printh FF FF FF
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*Explanation*
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- ``printh 91`` Tells the library this is a sensor (int) data
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- ``prints "temperature",0`` Sends the name that matches **component_name** or **variable_name**
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- ``printh 00`` Sends a NULL
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- ``prints temperature.val,0`` The actual value to send. For a variable use the Nextion variable name ``temperature`` with out ``.val``
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- ``printh FF FF FF`` Nextion command ack
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See Also
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--------
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- :doc:`/components/display/nextion`
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- :doc:`index`
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- :apiref:`nextion/sensor/nextion_sensor.h`
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- :ghedit:`Edit`
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