Cheap Yellow Display ESP32-035 config

ESPHome
1

This is my first ESPHome project - to set up a display using a 3.5 inch CYD which I randomly bought of Aliexpress. On the back it just has ESP32-035 written on it with a central USB C and a ESP32 N4XX chip. Could find very little on it on googleing but with a bit of trial and error I found a config that worked, so I thought I would share it. I have to say thank you to littleCdev https://github.com/littleCdev/ESP32-035/ who posted some code for this device that helped me get the pins right. Also it seems the tft and touchscreen use the same spi pins - which set me in the right direction.

esphome:
  name: cyd35
  friendly_name: cyd35

esp32:
  board: esp32dev
  framework:
    type: arduino

#i2c:
#  - sda: 27
#    scl: 22
#    scan: true

spi:
  - id: tft
    clk_pin: 14
    mosi_pin: 13
    miso_pin:
      number: 12
      ignore_strapping_warning: true
#  - id: touch
#    clk_pin: 14
#    mosi_pin: 3
#    miso_pin: 36

output:
  - id: backlight_pwm
    platform: ledc
    pin: GPIO27
  - id: output_red
    platform: ledc
    pin: 4
    inverted: true
  - id: output_green
    platform: ledc
    pin: 16
    inverted: true
  - id: output_blue
    platform: ledc
    pin: 17
    inverted: true

light:
  - id: backlight
    platform: monochromatic
    output: backlight_pwm
    name: Display Backlight
    initial_state:
        state: on
    restore_mode: ALWAYS_ON
  - id: led
    name: display led
    internal: false
    platform: rgb
    red: output_red
    green: output_green
    blue: output_blue
    restore_mode: ALWAYS_OFF

display:
  - id: main_display
    platform: ili9xxx
    model: ILI9341
    dimensions:
      height: 320
      width: 480
    spi_id: tft
    cs_pin:
      number: GPIO15
      ignore_strapping_warning: true
    dc_pin:
      number:  GPIO2
      ignore_strapping_warning: true
    reset_pin: GPIO3
    invert_colors: false
    update_interval: never
    auto_clear_enabled: false
    transform:
      mirror_x: true
      swap_xy: true
      mirror_y: true

touchscreen:
  - id: main_touchscreen
    platform: xpt2046
    spi_id: tft
    cs_pin: 33
    interrupt_pin: 36
    threshold: 400
    calibration:
      x_min: 480
      x_max: 3860
      y_min: 320
      y_max: 3860
    transform:
      mirror_x: false
      swap_xy: true
      mirror_y: true

This is for a landscape view with usb port on left. All seems to work from tft and touch. (Except that I can change colours/brightness on the built in LED from home assistant, but cannot do a simple on/off of the LED). I hope this helps someone.

2

I have had this CYD lying arround for some time now and I was not able to get to work in ESPhome. I just tried your config and all I get is this:

1536-2048-max
1536-2048-max1536×2048 537 KB

3

You probably have the ST7789 display driver rather than the ILI9341 defined in OP’s config.

Try the tft_eSPI library. The User_setup.h file has pin definitions and config for many of these which you can just copy and paste and tweak from there if needed.