Hello @pkscout and all,
Thank you very much for this post, as it’s the only one where I’ve found useful information about the Waveshare ESP32 display.
I personally have a Waveshare ESP32-S3 5-inch 1024x600 display (Link).
I tried toggling the backlighting on and off using only the CH422G, but without complete success. In other words, I can turn the backlighting off and on (without the ability to adjust it), but when I turn it back on, unfortunately, a ring appears around the display near the edges. This disappears after a few hours, but it becomes more pronounced and persists longer the longer the backlighting is off. I contacted support, but they said this is normal because the CH422G not only turns off the backlighting, but also removes the RGB signal, and the ringing when I turn it back on is due to that.
I’ve analyzed the datasheets and would like your opinion to see if my reasoning is correct.
Physically, I need to connect the PWM solder point to the RS485-A pin (I’m attaching two images, one of the actual board and one of the logic).
Logically, I need to use a code very similar to yours, except that the GPIO must be 43 (not 16). This is based on the attached diagram, where GPIO 43 corresponds to RS485 RXD (aka “A”). I checked, and on your display (7" 480x800, it corresponds to GPIO16).
So, the code should be as follows:
# Backlight
output:
- platform: ledc
pin: GPIO43
id: backlight
light:
- platform: monochromatic
output: backlight
name: backlight
restore_mode: ALWAYS_ON
switch:
- platform: template
name: antiburn
icon: mdi:television-shimmer
optimistic: true
entity_category: "config"
turn_on_action:
- logger.log: "Starting Antiburn"
- if:
condition: lvgl.is_paused
then:
- lvgl.resume:
- lvgl.widget.redraw:
- lvgl.pause:
show_snow: true
turn_off_action:
- logger.log: "Stopping Antiburn"
- if:
condition: lvgl.is_paused
then:
- lvgl.resume:
- lvgl.widget.redraw:
- platform: gpio
name: backlight switch
pin:
ch422g: io_ex
number: 2
restore_mode: ALWAYS_ON
internal: true
Could you please support me and confirm if what I wrote is correct?
I look forward to your kind feedback before proceeding with the physical and logical operations.
Just one last question: to disable the backlight, if I can implement the above configuration, you set the brightness value of the monochrome light to zero, right?
Thank you very much in advance.
Best regards,
Matteo