streampunk wrote: > Hi, > for all that are using the touchscreen display in self constructed > mobile devices (i.e. running on battery power), it would be great to > have an option to put the screen and its backlight into standby after a > certain time. > It seems that this is not really trivial, as the touchscreen needs to be > present at boot time and can't simply be switched off and on after > booting. There are lots of threads on this, e.g. > https://www.raspberrypi.org/forums/viewtopic.php?f=91&t=120968&start=150 > The power saving mode integrated into PCP/jivelite only works with the > official display. > I found the pinout here: > https://diyhacking.com/raspberry-pi-touchscreen-lcd-tutorial/ - its for > the 3.2 Inch display, but I suppose that its identical for the 3.5. > Has anybody succeeded in finding a solution for a power saving mode for > the touchscreen? > Best regards > Martin In the past i spended some time to that problem and i cant find a solution. I think there is no way to control the backlight of that cheap displays. The controler chip is direct wired to 5V and has no backlight pin. The hdmi versions of the waveshare displays have a mechanical backlightswitch. For that ones you can found tutorials for switching off the backlight via gpio.
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