esphome-docs/components/switch/nextion.rst

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.. _nextion_switch:
Nextion Switch Component
===============================
.. seo::
:description: Instructions for setting up Nextion Switch.
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:image: nextion.jpg
The ``nextion`` switch platform supports the many switched components in the Nextion as well as integer variables. It can be a component or variable in the Nextion display.
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It is best to set the components vscope to global in the Nextion Editor. This way the component will be available if the page is shown or not.
See :doc:`/components/display/nextion` for setting up the display
.. code-block:: yaml
# Example configuration entry
display:
- platform: nextion
id: nextion1
# ...
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switch:
- platform: nextion
id: r0_switch
name: "Radio 0 Switch"
component_name: r0 # pageX.r0 for a global
update_interval: 4s
- platform: nextion
id: darkmode
name: "Is Darkmode Set"
variable_name: darkmode
Configuration variables:
------------------------
- **name** (**Required**, string): The name of the sensor.
- **nextion_id** (*Optional*, :ref:`config-id`): The ID of the Nextion display.
- **component_name** (*Optional*, string): The name of the Nextion component.
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- **variable_name** (*Optional*, string): The name of the Nextion variable. Any value over ``0`` is considered to be **on**
- **update_interval** (*Optional*, :ref:`config-time`): The duration to update the sensor. If using a :ref:`nextion_custom_switch_protocol` this should not be used
- **background_color** (*Optional*, :ref:`config-color`): The background color
- **background_pressed_color** (*Optional*, :ref:`config-color`): The background color when pressed
- **foreground_color** (*Optional*, :ref:`config-color`): The foreground color
- **foreground_pressed_color** (*Optional*, :ref:`config-color`): The foreground color when pressed
- **visible** (*Optional*, boolean): Visible or not
- All other options from :ref:`Switch <config-switch>`.
**Only one** *component_name* **or** *variable_name* **can be set**
See :ref:`nextion_switch_how_things_update` for additional information
Globals
*******
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
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**
should be prefixed with the page name (page0/page1 or whatever you have changed it to).
*Example*
``component_name: page0.r0``
.. _nextion_switch_lambda_calls:
Lambda Calls
************
From :ref:`lambdas <config-lambda>`, you can call several methods to access
some more advanced functions (see the full :apiref:`nextion/nextion_switch.h` for more info).
.. _nextion_switch_set_state:
- ``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.
.. _nextion_switch_update:
- ``update()``: Poll from the Nextion
.. _nextion_switch_settings:
- ``set_background_color(Color color)``: Sets the background color to **Color**
- ``set_background_pressed_color(Color color)``: Sets the background color to **Color**
- ``set_foreground_color(Color color)``: Sets the background color to **Color**
- ``set_foreground_pressed_color(Color color)``: Sets the background color to **Color**
- ``set_visible(bool visible)`` : Sets visible or not. If set to false, no updates will be sent to the component
.. _nextion_switch_how_things_update:
How things Update
-----------------
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_switch_protocol` for this. Add the :ref:`nextion_custom_switch_protocol` to the
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.
.. note::
There is no need to check the *Send Component ID* for the *Touch Press Event* or *Touch Release Event*
since this will be sending the real value to esphome.
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Using the above yaml example:
- "Radio 0 switch" will poll the Nextion for the ``r0.val`` value and set the state accordingly.
- "Is Darkmode Set" will NOT poll the Nextion. Either the Nextion will need to use the :ref:`nextion_custom_switch_protocol` or use a lambda:
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- :ref:`Lambda Calls <nextion_switch_lambda_calls>`.
.. note::
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.
.. _nextion_custom_switch_protocol:
Nextion Custom Switch Protocol
------------------------------
All lines are required
.. code-block:: c++
printh 90
prints "r0",0
printh 00
prints r0.val,0
printh FF FF FF
*Explanation*
- ``printh 90`` Tells the library this is a switch bool/integer data
- ``prints "r0",0`` Sends the name that matches **component_name** or **variable_name**
- ``printh 00`` Sends a NULL
- ``prints r0.val,0`` The actual value to send. For a variable use the Nextion variable name ``r0`` with out ``.val``
- ``printh FF FF FF`` Nextion command ack
See Also
--------
- :doc:`/components/display/nextion`
- :doc:`index`
- :apiref:`nextion/switch/nextion_switch.h`
- :ghedit:`Edit`