Control (hack) monitor background light by ESP32, Need advise where to start.

[jaddel]

Dear Community,

i own a Samsung U28E850R 28-Inch LED Monitor and was wondering if it would be possible, to open the device and take over background brightness control via an ESP32 chip, so that i could integrate brightness control into homeassistant?

https://www.amazon.de/-/en/gp/product/B00WUACEKW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I've very basic knowledge and can't judge the amount of effort that would be needed to achieve this. Please let me know what you think about and where to start if I want to do a serious approach.

Thank you.

[Raj]

totally possible...just hijack the pwm line

[jaddel]

thanks for the reply, could you please specify it a little more.

What does it mean to do this?

If you would separate the project into steps, which keyword would you give to me to get into the matter?

[Gabriel]

There should be a microcontroller inside the monitor that controls the backlight intensity via PWM. Find that.

Then carefully break the trace and connect in one of the PWM capable pins of the ESP32.

Write code.

Upload code.

Profit?

Of course, you want to make sure that the PWM voltage of the monitor is the same as what your ESP will output. Also, make sure the ESP can handle the current that may be drawn (depends on how it is all set up).

[jaddel]

thank you for the reply.
I'll try it this weekend.