In my experience when the screen seems to be functioning but is blank, it’s normally the backlight, just make sure there’s no pin or config missing to turn on the backlight
I believe it’s labelled as TFT_RS on that board. You’ll also want to specify CS and RESET. You’ll need a schematic or sample code to figure out which pins they are. And you’ll need to turn on the backlight with the TFT_BL pin - a monochromatic light component will allow you to adjust the brightness.
Thanks for the tips.
Based on this wiring diagram for the TFT:
I figured the RS/DC is IO2 and CS is IO15.
There’s that pin labeled RESET, but it seems to be hard-wired. Is that normal?
Regarding the BACKLIGHT, the screen seems to be lit up very bright (white). So at least I think it’s on by default.
There appears to be sample code here along with the wiring diagram I got here. (After translation, it says RESET is the LCD reset signal line. Because the GPIO on the start board is tight, it is connected to the RESET line of the system. Similarly, BL is the backlight control line of the LCD, which is also directly connected to 3.3V. – but I don’t know if that’s correct, or lost in translation. At least it would explain the backlight being always on.)
However, the sample code is very frustrating, because it uses macros like PIN_NUM_RST, bit the headers that define those constants are not available – or at least I couldn’t figure out how to get them, even after having Google translate the page from Chinese.
Any suggestions?
For those interested in working with LVGL, I’ve successfully configured it using the following hardware setup:
Microcontroller: Lolin D32 PRO
Display: TFT 2.4 Touch Shield
TFT Driver: ILI9341
Touch Controller: XPT2046
Also notice the framework, not esp-idf but arduino did the trick for me.
esphome:
name: esp-display-lolin
friendly_name: ESP Display Lolin
platformio_options:
build_flags: "-DBOARD_HAS_PSRAM"
esp32:
board: lolin_d32_pro
framework:
type: arduino
external_components:
- source: github://clydebarrow/esphome@lvgl
components: [ lvgl ]
# Enable logging
logger:
# Enable Home Assistant API
api:
encryption:
key: !secret esphome_api
ota:
- platform: esphome
password: !secret esphome_ota
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
web_server:
local: true
captive_portal:
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%
- id: my_black
red: 0%
green: 0%
blue: 0%
- id: my_white
red: 100%
green: 100%
blue: 100%
font:
- file: "arial.ttf"
id: arial_48
size: 48
- file: "arial.ttf"
id: arial_36
size: 36
- file: "arial.ttf"
id: arial_24
size: 24
- file: "arial.ttf"
id: arial_12
size: 12
time:
- platform: homeassistant
id: esptime
sensor:
- platform: homeassistant
id: inside_temperature
entity_id: sensor.gw2000a_indoor_temperature
internal: true
- platform: homeassistant
id: outside_temperature
entity_id: sensor.gw2000a_temperature_1
internal: true
- platform: wifi_signal
name: "WiFi Signal Strength"
update_interval: 60s
spi:
clk_pin: 18
mosi_pin: 23
miso_pin: 19
touchscreen:
platform: xpt2046
id: touch_key1
cs_pin: 12
update_interval: 50ms
calibration:
x_min: 281
x_max: 3848
y_min: 347
y_max: 3878
transform:
mirror_x: false
mirror_y: false
swap_xy: false
lvgl:
displays:
- tft_ha_test
pages:
- id: main_page
widgets:
- label:
align: CENTER
text: 'Hello World!'
display:
- platform: ili9xxx
model: ili9341
cs_pin: 14
dc_pin: 27
reset_pin: 33
rotation: 90
auto_clear_enabled: false
invert_colors: false
show_test_card: false
id: tft_ha_test
