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[Raspberry Pi] Back light

hyeok0724.kim@gmail.com 2019. 11. 6. 10:57
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Writed on 06 NOV 2019
Device: Raspberry Pi 3
Raspbian Version: 2019-09-26-raspbian-buster-full.zip

 

1. Control screen ON of OFF

 - echo 0 mean Display ON

 - echo 1 mean Display OFF

 

Reference: https://scribles.net/controlling-display-backlight-on-raspberry-pi/

 

Controlling Display Backlight on Raspberry Pi

This is how to turn on and off backlight on Raspberry Pi for the official 7-inch touchscreen display and HDMI displays using command-line interface (CLI). I checked it with Raspberry Pi 3 B+ running Raspbian Stretch (September 2017 version) + official 7″ d

scribles.net

2. Control screen with rpi-backlight

 1) Install rpi-backlight

 2). Create this udev rule to update permissions, otherwise you'll have to run python code, the GUI and CLI as root when changing the power or brightness

echo 'SUBSYSTEM=="backlight",RUN+="/bin/chmod 666 /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power"' sudo tee -a /etc/udev/rules.d/backlight-permissions.rules

 3) example of controling brightness

Reference:

 - https://github.com/linusg/rpi-backlight

 

linusg/rpi-backlight

A Python module for controlling power and brightness of the official Raspberry Pi 7" touch display - linusg/rpi-backlight

github.com

 - http://blog.naver.com/PostView.nhn?blogId=bieemiho92&logNo=221023148678&redirect=Dlog&widgetTypeCall=true

 

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