How to power off 3.5inch LCD when unused?

Question

How to power off 3.5inch LCD when unused?

liluom opened this issue 6 years ago · comments

liluom commented 6 years ago

Hi. Can i power off it (3.5inch RPi LCD (A)) for power saver by python? Thank you!

Denis Schrainer commented 5 years ago

And how?

waveshare · Answer 1 · Mon Jan 21 2019 18:35:45 GMT+0800 (China Standard Time)

About how to control the backlight by programming, we have updated to wiki, please it.

SSQ66648 · Answer 2 · Sun Jul 19 2020 00:39:38 GMT+0800 (China Standard Time)

i am currently experimenting with https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(A) on a RPi 3B+.
the driver seems to work and rotating screen (./LCD35-show 720) etc works.
But how do we turn off the backlight after shutdown?
I have looked through the wiki as you mentioned but there is no mention of the backlight on that page and I cannot find anything else that seems relevent?
could you please provide instructions on howw to do this or even a link to the wiki instructions?
many thanks

Jean-Yves TOUMIT · Answer 3 · Thu Sep 03 2020 17:30:22 GMT+0800 (China Standard Time)

I have the same question here. How to programmatically switch off the screen? What about changing the brightness (what the small button on the back does). Thanks.

Eugene Schava · Answer 4 · Sat Oct 03 2020 15:20:39 GMT+0800 (China Standard Time)

Will instructions from https://www.waveshare.com/wiki/3.5inch_RPi_LCD_(C) work for LCD (A) ?

Leshauts · Answer 5 · Sat Oct 28 2023 07:47:07 GMT+0800 (China Standard Time)

This doc shows how to install and adjust brightness, but it doesn't make it possible to turn the backlight off. Also, even with this soft installed, when the display goes to idle, the backlight stays on...