(11-21-2020, 11:29 AM)Ale2.0 Wrote: Hello there

I am currently using a Waveshare 5" Display as main control unit. The annoying thing about it, is the backlight which is not dimmed or turned off at any point. 

Because of this I made a little circuit which dims the display according to the signal of a LDR (Light dependant resistor) as well as the possibility to turn off the backlight completely if a 5V high signal is put on it. 

This means, I can now turn off the display completely and it is dimmed according to the actual amount of light in the room. (If someone wants the schematic, let me know)

What I would need now is a GPIO from the raspberry which goes high if the HDMI output / rpi is in sleep. 

I saw some complicated possibilities for this but as you already integrated an output on change it may be an easy task for you.

It would really be great, because the always gray screen during night is annoying and also destroys the backlight. 
(I did not use the official Display because of the thick frame as well as the usage of many GPIOs)

Thank you beforehand and thanks one more time for this great System!

Sincerely Ale

(11-21-2020, 12:05 PM)Cardone Wrote: Hello,
on this page https://tangielskyblog.wordpress.com/2018/05/19/ein-ausschalter-fuer-das-raspberry-pi-display/ something is described.
Maybe this will help you ...


Ciao
zeferino

Code:
/opt/vc/bin/tvservice -s
• or
  
  
  Code:

  vcgencmd display_power
• With these commands you can see the hdmi status, does it turn off while blanking? If yes we could construct a script around it. (I can create scripts in batch, a bit powershell visualbasic but sadly nothing Raspberry related...)