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esphome-docs/components/display/st7789v.rst
Keith Burzinski 7f45841551
Add documentation for ST7789V display module (as on TTGO T-Display) (#594) 
* Added ST7789 documentation

* Fix indentation

* Added color component, copy fixes

* Copy correction

* Update for Colors

* Updated changelog

* rename colors to color

Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>
2020-06-28 18:37:55 -03:00

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ST7789V TFT LCD
===============
.. seo::
:description: Instructions for setting up ST7789V TFT LCD display drivers.
:image: st7789v-full.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>`; the physical
connection is already in place on the TTGO T-Display module as shown below.
.. figure:: images/st7789v-full.jpg
:align: center
:width: 75.0%
ST7789V TFT LCD on TTGO T-Display module
This module has a USB-C connector with an on-board serial adapter for programming. Simply connect to a
USB-C port to get started! (Depending on your operating system of choice, you might need to install an
appropriate driver.) It is also possible to power the module via the 5V and G (ground) pins along
the edges of the module, or via a battery attached to the connector on the bottom of the board. The
ESP32's UART pins are not brought out to the headers, so the on-board serial adapter must be used for
hardwired programming. (OTA updates are of course possible after ESPHome is initially installed.)
.. code-block:: yaml
# Example minimal configuration entry
spi:
clk_pin: GPIO18
mosi_pin: GPIO19
display:
- platform: st7789v
backlight_pin: GPIO4
cs_pin: GPIO5
dc_pin: GPIO16
reset_pin: GPIO23
lambda: |-
it.print(0, 0, id(font), "Hello World!");
.. 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
***********************
- **backlight_pin** (:ref:`Pin Schema <config-pin_schema>`): The display's backlight pin.
- **cs_pin** (:ref:`Pin Schema <config-pin_schema>`): The CS pin.
- **dc_pin** (:ref:`Pin Schema <config-pin_schema>`): The DC pin.
- **reset_pin** (:ref:`Pin Schema <config-pin_schema>`): The RESET 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.
Configuration examples
**********************
As of version 1.15, ESPHome supports color displays. To utilize the color capabilities of this display
module, you'll likely want to add a ``color:`` section to your YAML configuration; please see
:ref:`color <config-color>` for more detail on this configuration section.
To use colors in your lambada:
.. 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: RGB565
...
display:
...
lambda: |-
it.image(0, 0, id(my_image));
Complete example
****************
The following is a complete example YAML configuration that does a few things beyond the usual
Wi-Fi, API, and OTA 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 lambada 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 lambada to hide or show the image or text as you wish.
.. code-block:: yaml
esphome:
name: esp_tdisplay
platform: ESP32
board: featheresp32
wifi:
ssid: "ssid"
password: "password"
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "esp_tdisplay"
password: "some_password"
captive_portal:
# Enable logging
logger:
# Enable Home Assistant API
api:
password: "some_api_password"
ota:
password: "some_ota_password"
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
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
# We can still control the backlight independently
switch:
- platform: gpio
pin: GPIO4
name: "Backlight"
id: backlight
image:
- file: "image.png"
id: my_image
resize: 200x200
type: RGB565
time:
- platform: homeassistant
id: esptime
spi:
clk_pin: GPIO18
mosi_pin: GPIO19
display:
- platform: st7789v
backlight_pin: GPIO4
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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