ST7789V TFT LCD

Usage

The st7789v display platform allows you to use ST7789V (datasheet, Tindie) displays with ESPHome. Note that this component utilizes the 4-Wire SPI bus.

../../_images/st7789v-full.jpg

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.

# 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!");

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 (Required, Pin Schema): The CS pin.

  • dc_pin (Required, Pin Schema): The DC pin.

  • reset_pin (Required, 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, Pin Schema): The display’s backlight pin.

  • lambda (Optional, lambda): The lambda to use for rendering the content on the display. See Display Rendering Engine for more information.

  • update_interval (Optional, Time): The interval to re-draw the screen. Defaults to 5s.

  • pages (Optional, list): Show pages instead of a single lambda. See Display Pages.

  • id (Optional, 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:

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:

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.

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

# 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: RGB24

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