106 lines
4.7 KiB
ReStructuredText
106 lines
4.7 KiB
ReStructuredText
Waveshare E-Paper Display
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=========================
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.. seo::
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:description: Instructions for setting up Waveshare E-Paper displays in esphomelib.
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:image: waveshare_epaper.jpg
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The ``waveshare_epaper`` display platform allows you to use
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some E-Paper displays sold by `Waveshare <https://www.waveshare.com/product/modules/oleds-lcds/e-paper.htm>`__
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with esphomelib. Similar modules sold by other vendors might also work but not have been tested yet. Currently only
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single-color E-Ink displays are implemented and of those only a few modules.
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.. figure:: images/waveshare_epaper-full.jpg
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:align: center
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:width: 75.0%
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Waveshare E-Paper 2.9 Inch E-Paper Display.
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The communication esphomelib has chosen to use for this integration is 4-wire :ref:`SPI <spi>`, as it's the most stable
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and high-speed. So you need to make sure your board is set to the 4-wire SPI mode and have an ``spi:`` section in your
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configuration.
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==================== ===================== =====================
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**E-Paper Pin** **ESP Pin** **esphomelib Option**
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-------------------- --------------------- ---------------------
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``VCC`` ``3.3V`` N/A
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-------------------- --------------------- ---------------------
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``GND`` ``GND`` N/A
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-------------------- --------------------- ---------------------
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``CLK`` Any GPIO ``spi.clk_pin``
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-------------------- --------------------- ---------------------
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``DIN`` Any GPIO ``spi.mosi_pin``
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-------------------- --------------------- ---------------------
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``CS`` Any GPIO ``cs_pin``
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-------------------- --------------------- ---------------------
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``DC`` Any GPIO ``dc_pin``
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-------------------- --------------------- ---------------------
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``BUSY`` (Optional) Any GPIO ``busy_pin``
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-------------------- --------------------- ---------------------
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``RESET`` (Optional) Any GPIO ``reset_pin``
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==================== ===================== =====================
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.. figure:: images/waveshare_epaper-pins.jpg
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:align: center
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:width: 60.0%
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.. code-block:: yaml
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# Example configuration entry
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spi:
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clk_pin: D0
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mosi_pin: D1
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display:
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- platform: waveshare_epaper
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cs_pin: D2
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dc_pin: D3
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busy_pin: D4
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reset_pin: D5
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model: 2.90in
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full_update_every: 30
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lambda: |-
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it.print(0, 0, id(font), "Hello World!");
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Configuration variables:
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------------------------
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- **cs_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The CS pin.
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- **dc_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The DC pin.
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- **model** (**Required**): The model of the E-Paper display. Options are:
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- ``1.54in``
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- ``2.13in`` (not tested)
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- ``2.70in`` (not tested)
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- ``2.90in``
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- ``4.20in`` (not tested)
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- ``7.50in`` (not tested)
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- **busy_pin** (*Optional*, :ref:`Pin Schema <config-pin_schema>`): The BUSY pin. Defaults to not connected.
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- **reset_pin** (*Optional*, :ref:`Pin Schema <config-pin_schema>`): The RESET pin. Defaults to not connected.
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Make sure you pull this pin high (by connecting it to 3.3V with a resistor) if not connected to a GPIO pin.
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- **rotation** (*Optional*): Set the rotation of the display. Everything you draw in ``lambda:`` will be rotated
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by this option. One of ``0°`` (default), ``90°``, ``180°``, ``270°``.
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- **full_update_every** (*Optional*, int): E-Paper displays have two modes of switching to the next image: A partial
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update that only changes the pixels that have changed and a full update mode that first clears the entire display
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and then re-draws the image. The former is much quicker and nicer, but every so often a full update needs to happen
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because artifacts accumulate. On the ``1.54in``, ``2.13in`` and ``2.90in`` models you have the option to switch only
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do a full-redraw every x-th time using this option. Defaults to ``30`` on the described models and a full update for
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all other models.
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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-engine` for more information.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval to re-draw the screen. Defaults to ``10s``.
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- **spi_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`SPI Component <spi>` if you want
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to use multiple SPI buses.
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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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- :apiref:`display/waveshare_epaper.h`
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- `Arduino Waveshare E-Paper library <https://github.com/soonuse/epd-library-arduino>`__ by `Yehui (@soonuse) <https://github.com/soonuse>`__
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- :ghedit:`Edit`
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.. disqus::
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