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86 lines
3.3 KiB
ReStructuredText
86 lines
3.3 KiB
ReStructuredText
Nextion TFT LCD Display
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=======================
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The ``nextion`` display platform allows you to use Nextion LCD displays (`datasheet <https://nextion.itead.cc/resources/datasheets/>`__,
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`iTead <https://www.itead.cc/display/nextion.html>`__)
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with esphomelib.
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.. figure:: images/nextion-full.jpg
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:align: center
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:width: 75.0%
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Nextion LCD Display.
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As the communication with the MH-Z19 is done using UART, you need to have an :ref:`UART bus <uart>`
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in your configuration with ``rx_pin`` both the ``tx_pin`` set to the respective pins on the display.
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Additionally, you need to set the baud rate to 9600.
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.. code:: yaml
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# Example configuration entry
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uart:
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rx_pin: D0
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tx_pin: D1
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baud_rate: 9600
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display:
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- platform: nextion
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lambda: |-
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it.set_component_value("gauge", 50);
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it.set_component_text("textview", "Hello World!");
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Configuration variables:
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------------------------
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- **uart_id** (*Optional*, :ref:`config-id`): The ID of the :ref:`UART bus <uart>` you wish to use for this display.
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Use this if you want to use multiple UART buses at once.
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- **lambda** (*Optional*, :ref:`lambda <config-lambda>`): The lambda to use for rendering the content on the nextion display.
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See :ref:`display-nextion_lambda` for more information.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval to call the lambda to update the display.
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Defaults to ``5s``.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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.. _display-nextion_lambda:
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Rendering Lambda
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----------------
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With Nextion displays, a dedicated chip on the display itself does the whole rendering. esphomelib can only
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send *instructions* to the display to tell it *how* to render something and *what* to render.
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First, you need to use the `Nextion Editor <https://nextion.itead.cc/resources/download/nextion-editor/>`__ to
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create a display file and insert it using the SD card slot. Then, in the rendering ``lambda``, you have 3 main methods
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you can call to populate data on the display:
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.. code:: yaml
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display:
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- platform: nextion
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# ...
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lambda: |-
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// set the "value" of a component - value is always an integer
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// for example gauges represent their status using integers from 0 to 100
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it.set_component_value("gauge", 50);
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// set the text of a component
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it.set_component_text("textview", "Hello World!");
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// set the text of a component with formatting
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it.set_component_text("textview", "The uptime is: %.1f", id(uptime_sensor).value);
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Please see :ref:`display-printf` for a quick introduction into the ``printf`` formatting rules and
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:ref:`display-strftime` for an introduction into the ``strftime`` time formatting. Additionally, check
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out :ref:`api-display-nextion` for the full API of the Nextion display object.
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See Also
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--------
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- :doc:`index`
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- :doc:`API Reference </api/display/nextion>`
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- `Simple Nextion Library <https://github.com/bborncr/nextion>`__ by `Bentley Born <https://github.com/bborncr>`__
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- `Official Nextion Library <https://github.com/itead/ITEADLIB_Arduino_Nextion>`__ by `iTead <http://itead.cc/>`__
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- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/display/nextion.rst>`__
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