62 lines
2.4 KiB
ReStructuredText
62 lines
2.4 KiB
ReStructuredText
PCF8574 Character-Based LCD Display
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===================================
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.. seo::
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:description: Instructions for setting up the touch pad on the ESP32.
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:image: lcd.jpg
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The ``lcd_pcf8574`` display platform allows you to use standard character-based LCD displays like `this one <https://docs.labs.mediatek.com/resource/linkit7697-arduino/en/tutorial/driving-1602-lcd-with-pcf8574-pcf8574a>`__
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with esphomelib. This integration is only for LCD displays that display individual characters on a screen (usually 16-20 columns
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and 2-4 rows), and not for LCD displays that can control each pixel individually.
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This version of the LCD integration is for LCD displays with an PCF8574 connected to all the data pins. This has
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the benefit that you only need to connect two data wires to the ESP instead of the 6 or 10 with the :doc:`lcd_gpio`.
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As the communication with the :ref:`I²C Bus <i2c>`, you need to have an ``i2c:`` section in your configuration.
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.. figure:: images/lcd-pcf8574.jpg
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:align: center
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:width: 75.0%
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The PCF8574 chip attached to the LCD Display.
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.. figure:: images/lcd-hello_world.jpg
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:align: center
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:width: 60.0%
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.. code:: yaml
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# Example configuration entry
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i2c:
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sda: D0
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scl: D1
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display:
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- platform: lcd_pcf8574
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dimensions: 18x4
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address: 0x3F
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lambda: |-
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it.print("Hello World!");
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Configuration variables:
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------------------------
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- **dimensions** (**Required**, string): The dimensions of the display with ``ROWSxCOLUMNS``. If you're not
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sure, power the display up and just count them.
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- **address** (*Optional*, int): The :ref:`I²C <i2c>` address of the PCF8574 chip, defaults to ``0x3F``.
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- **lambda** (*Optional*, :ref:`lambda <config-lambda>`): The lambda to use for rendering the content on the display.
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See :ref:`display-lcd_lambda` for more information.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval to re-draw the screen. Defaults to ``1s``.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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See Also
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--------
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- :doc:`index`
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- :doc:`lcd_gpio`
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- :doc:`/esphomeyaml/components/pcf8574`
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- :doc:`API Reference </api/display/lcd_display>`
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- `Arduino LiquidCrystal Library <https://www.arduino.cc/en/Reference/LiquidCrystal>`__
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- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/display/lcd_pcf8574.rst>`__
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.. disqus::
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