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esp32-2432s028.md

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Ready Made Devices

Sunton ESP32-2432S028

ESP32-2432S028

Often sold as a "LVGL" development board. AliExpress

Full configuration can be found at esp32-2432s028.yaml.

ESPhome Configuration

esphome:
  name: screen
  includes:
  - display_functions.h
  on_boot:
    - lambda: |-
        uint8_t val = 0x40;
        uint8_t len = 1;
        my_display->send_command(esphome::ili9xxx::ILI9XXX_MADCTL, &val, len);
  • Include the display_functions.h re-used display components library (found in this repoistory)
  • Manual configuration of the Memory Addressing type for the display to bet set on boot.
esp32:
  board: esp32dev
  framework:
    type: arduino
  • Standard esp32 development board configuration
spi:
   - clk_pin: GPIO14
     mosi_pin: GPIO13
     miso_pin: GPIO12
     id: bus_tft

   - clk_pin: GPIO25
     mosi_pin: GPIO32
     miso_pin: GPIO39
     id: bus_ts

  • bus_tft is the SPI bus used by the TFT Display

  • bus_ts is the SPI bus used by the Touchscreen

  • TODO: SD Card support?

i2c:
   - sda: GPIO27
     scl: GPIO22
     scan: true
     id: bus_a
  • I don't currently use i2c on the coffee table device however I define the bus anyway.
touchscreen:
  platform: xpt2046
  interrupt_pin: 36
  cs_pin: 33
  display: my_display
  id: my_touchscreen
  spi_id: bus_ts
  update_interval: 50ms
  report_interval: 1s
  threshold: 400
  calibration_x_min: 3775
  calibration_x_max: 404
  calibration_y_min: 3587
  calibration_y_max: 289
  transform:
     swap_xy: true
  on_touch:
    - lambda: |-
          ESP_LOGI("cal", "x=%d, y=%d, x_raw=%d, y_raw=%0d",
              touch.x,
              touch.y,
              touch.x_raw,
              touch.y_raw
              );

If you are running esphome prior to 2023.12; you will need the following code instead of the transform & on_touch blocks (remove transform as well);

  ...
  swap_x_y: true
  on_touch:
    - lambda: |-
          ESP_LOGI("cal", "x=%d, y=%d, x_raw=%d, y_raw=%0d",
              id(my_touchscreen).x,
              id(my_touchscreen).y,
              id(my_touchscreen).x_raw,
              id(my_touchscreen).y_raw
              );
  • Touchscreen configuration for using this display in portrait orientation.
  • Refer to the full configuration in this repository for my latest calibration values.
output:

  - platform: ledc
    pin: GPIO21
    id: backlight_pin

  - platform: ledc
    id: output_red
    pin: GPIO4
    inverted: true

  - platform: ledc
    id: output_green
    pin: GPIO16
    inverted: true

  - platform: ledc
    id: output_blue
    pin: GPIO17
    inverted: true
  • The TFT Backlight is on GPIO21 and defined using ledc and a monochromatic light
  • LED outputs for the RGB elements on the onboard LED are also defined.
light:

  - platform: monochromatic
    output: backlight_pin
    name: "Display Backlight"
    id: back_light
    restore_mode: ALWAYS_ON

  - platform: rgb
    name: LED
    id: led
    red: output_red
    green: output_green
    blue: output_blue
    restore_mode: ALWAYS_OFF
  • Light components for the backlight with a default of ALWAYS_ON
  • RGB Light component for the LED on the board.`
sensor:
  - platform: adc
    pin: 34
    name: "Brightness"
    update_interval: 60s
  • Measure the Light Dependent Resistor to adjust the brightness. The onboard LDR utilises a 1M Ohm voltage divider to provide ranges that seem to be between 0.08V in indoor daylight and 1.0V in reasonably dark room. This value is used for auto-brightness adjustment.
display:
  - platform: ili9xxx
    id: my_display
    spi_id: bus_tft
    rotation: 90
    dc_pin: GPIO2
    cs_pin: GPIO15
    model: TFT_2.4R
    data_rate: 40MHz
    lambda: |-