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esphome-docs/components/display/st7789v.rst
Mike Ellis a34f2c8679
Update st7789v.rst (#2622) 
* Update st7789v.rst

Modified to allow dimmable control of the backlight (using GPIO4)

* Update st7789v.rst

---------

Co-authored-by: H. Árkosi Róbert <robreg@zsurob.hu>
2023-02-05 19:28:12 +00:00

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ST7789V TFT LCD
===============
.. seo::
:description: Instructions for setting up ST7789V TFT LCD display drivers.
:image: st7789v.jpg
.. _st7789v:
Usage
-----
The ``st7789v`` display platform allows you to use
ST7789V (`datasheet <https://github.com/Xinyuan-LilyGO/TTGO-T-Display>`__,
`Tindie <https://www.tindie.com/products/ttgo/lilygor-ttgo-t-display/>`__)
displays with ESPHome. Note that this component utilizes the 4-Wire :ref:`SPI bus <spi>`.
.. figure:: images/st7789v-full.jpg
:align: center
:width: 75.0%
ST7789V TFT LCD on TTGO T-Display module
The TTGO T-Display module shown has the display attached to the module's board and its connections to the ESP32
cannot be changed. Other display modules have pin headers or other connectors which must be connected appropriately
to an ESP module.
.. note::
Displays larger than the 135x240 pixel display on the TTGO T-Display shown require a significant amount of RAM
to operate correctly. Some ESP devices, such as the ESP8266, do not have sufficient memory to support this display.
If you attempt to use this component and experience repeated crashes, this is likely the cause of the issue.
.. code-block:: yaml
# Example minimal configuration entry
spi:
clk_pin: GPIO18
mosi_pin: GPIO19
display:
- platform: st7789v
model: TTGO TDisplay 135x240
backlight_pin: GPIO4
cs_pin: GPIO5
dc_pin: GPIO16
reset_pin: GPIO23
lambda: |-
it.print(0, 0, id(font), "Hello World!");
font:
- file: "gfonts://Roboto"
id: font
size: 20
.. note::
For more information about the font options see: :ref:`display-fonts`.
.. warning::
When using the TTGO T-Display module, the GPIO pin numbers above *cannot be changed* as they are
hardwired within the module/PCB.
Configuration variables:
************************
- **model** (**Required**, string): The display model to use. One of the following options:
- ``TTGO TDisplay 135x240``
- ``Adafruit Funhouse 240x240``
- ``Adafruit RR 280x240`` (round-rectangular display -- some pixels are "deleted" from corners to form rounded shape)
- ``Custom`` (see details below)
- **cs_pin** (*Optional*, :ref:`Pin Schema <config-pin_schema>`): The CS pin.
- **dc_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The DC pin.
- **reset_pin** (**Required**, :ref:`Pin Schema <config-pin_schema>`): The RESET pin.
- **height** (*Optional*, int): When ``model`` is set to "Custom", use this to specify the ``height`` of the display
in pixels. This option may not be specified when the ``model`` is not set to "Custom".
- **width** (*Optional*, int): When ``model`` is set to "Custom", use this to specify the ``width`` of the display
in pixels. This option may not be specified when the ``model`` is not set to "Custom".
- **offset_height** (*Optional*, int): When ``model`` is set to "Custom", use this to specify the display's vertical
offset in pixels. This option may not be specified when the ``model`` is not set to "Custom".
- **offset_width** (*Optional*, int): When ``model`` is set to "Custom", use this to specify the display's horizontal
offset in pixels. This option may not be specified when the ``model`` is not set to "Custom".
- **eightbitcolor** (*Optional*, boolean): Limits the supported color depth to eight bits. May be useful on
memory-constrained devices.
- **backlight_pin** (*Optional*, :ref:`Pin Schema <config-pin_schema>`): The display's backlight pin.
- **lambda** (*Optional*, :ref:`lambda <config-lambda>`): The lambda to use for rendering the content on the display.
See :ref:`display-engine` for more information.
- **update_interval** (*Optional*, :ref:`config-time`): The interval to re-draw the screen. Defaults to ``5s``.
- **pages** (*Optional*, list): Show pages instead of a single lambda. See :ref:`display-pages`.
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
.. note::
On memory-constrained devices, it may be possible to use *part* of the display area by setting the model to "custom"
and specifying a smaller ``height`` and/or ``width`` than that of the actual display.
Configuration examples
**********************
To use colors in your lambda:
.. code-block:: yaml
color:
- id: my_red
red: 100%
green: 3%
blue: 5%
...
display:
...
lambda: |-
it.rectangle(0, 0, it.get_width(), it.get_height(), id(my_red));
To bring in color images:
.. code-block:: yaml
image:
- file: "image.jpg"
id: my_image
resize: 200x200
type: RGB24
...
display:
...
lambda: |-
it.image(0, 0, id(my_image));
Complete example
****************
The following is an example YAML configuration that you can add to your base device configuration. It defines:
- three fonts (well, one font in three sizes)
- a ``binary_sensor`` that indicates the state of connectivity to the API
- a ``binary_sensor`` for each of the two buttons on the TTGO module
- a ``switch``, allowing control of the backlight from HA
- several colors
- a color image to be shown on the display
- time, for display...on the display
- the SPI configuration for communicating with the display
- the display component itself, for use on the TTGO module
- a lambda which paints the screen as shown in the picture above:
- blue borders, with a sort of "title bar" along the top
- "ESPHome" in yellow in the top left corner
- the API connection status, "Online" in green when connected, "Offline" in red when not
- the time and date, more or less in the center of the display
To use this example, you need only to provide the font file, "Helvetica.ttf" (or update it to
a font of your choosing) and an image file, "image.png" (it may also be a ".jpg"). Place these
into the same directory as the YAML configuration file itself. Comment/Uncomment/Modify the
appropriate lines of C code in the lambda to hide or show the image or text as you wish.
.. code-block:: yaml
color:
- id: my_red
red: 100%
green: 0%
blue: 0%
- id: my_yellow
red: 100%
green: 100%
blue: 0%
- id: my_green
red: 0%
green: 100%
blue: 0%
- id: my_blue
red: 0%
green: 0%
blue: 100%
- id: my_gray
red: 50%
green: 50%
blue: 50%
font:
- file: "Helvetica.ttf"
id: helvetica_48
size: 48
- file: "Helvetica.ttf"
id: helvetica_24
size: 24
- file: "Helvetica.ttf"
id: helvetica_12
size: 12
binary_sensor:
- platform: status
name: "Node Status"
id: system_status
- platform: gpio
pin:
number: GPIO0
inverted: true
mode:
input: true
pullup: true
name: "T-Display Button Input 0"
id: tdisplay_button_input_0
- platform: gpio
pin:
number: GPIO35
inverted: true
name: "T-Display Button Input 1"
id: tdisplay_button_input_1
# Allow dimmable control of the backlight (pin GPIO4)
output:
- platform: ledc
pin: GPIO4
id: gpio4
light:
- platform: monochromatic
output: gpio4
name: "Backlight"
image:
- file: "image.png"
id: my_image
resize: 200x200
type: RGB24
time:
- platform: homeassistant
id: esptime
spi:
clk_pin: GPIO18
mosi_pin: GPIO19
display:
- platform: st7789v
cs_pin: GPIO5
dc_pin: GPIO16
reset_pin: GPIO23
rotation: 270
lambda: |-
it.rectangle(0, 0, it.get_width(), it.get_height(), id(my_blue));
it.rectangle(0, 20, it.get_width(), it.get_height(), id(my_blue)); // header bar
it.strftime((240 / 2), (140 / 3) * 1 + 5, id(helvetica_24), id(my_gray), TextAlign::CENTER, "%Y-%m-%d", id(esptime).now());
it.strftime((240 / 2), (140 / 3) * 2 + 5, id(helvetica_48), id(my_gray), TextAlign::CENTER, "%H:%M:%S", id(esptime).now());
it.print(5, 5, id(helvetica_12), id(my_yellow), TextAlign::TOP_LEFT, "ESPHome");
// Comment out the above lines to see the image without text overlaid
// it.image(0, 0, id(my_image));
if (id(system_status).state) {
it.print(235, 5, id(helvetica_12), id(my_green), TextAlign::TOP_RIGHT, "Online");
}
else {
it.print(235, 5, id(helvetica_12), id(my_red), TextAlign::TOP_RIGHT, "Offline");
}
See Also
--------
- :doc:`index`
- :apiref:`st7789v_base/st7789v_base.h`
- :ghedit:`Edit`
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