(08-01-2021, 08:55 PM)jimOAP Wrote: Hi all, I've combed through the config file and documentation on here, and can't find an existing answer to my query.

I'm looking for a way to set a screen brightness value for each Day and Night modes, so that when switching between the two the screen brightness changes along with the UI colours & background image.
When in night mode I'd like my screen brightness at its lowest value, and when in day mode have it at the brightest value.

Is this possible? If not I'd like to suggest it as a new feature.


Thanks,
Phil

sudo nano /usr/local/bin/ButtonMonitor.py

#!/usr/bin/python

import RPi.GPIO as GPIO
import time
import subprocess, os
import signal
GPIO.setmode(GPIO.BCM) # set to BCM if using GPIO numbering, use GPIO.BOARD if using board pin numbers
GPIO.setwarnings(False)
Brightness_Switch = 17 # Set GPIO number lights are connected to
GPIO.setup(Brightness_Switch, GPIO.IN)

print "  Press Ctrl & C to Quit"

try:

   while True :
        time.sleep(0.1)
        if GPIO.input(Brightness_Switch)==0: #if lights are off (daytime), set brightness MAX (255)
                print "Setting Brightness to 255"
                subprocess.call ("/usr/local/bin/backlight.sh 255", shell=True)
                while GPIO.input(Brightness_Switch)==0:
                        time.sleep(0.1)

        if GPIO.input(Brightness_Switch)==1: #if lights on (night) set brightness to MIN (20)
                print "Setting Brightness to 20"
                subprocess.call ("/usr/local/bin/backlight.sh 20", shell=True)
                while GPIO.input(Brightness_Switch)==1:
                        time.sleep(0.1)



except KeyboardInterrupt:
  print "  Quit"
  GPIO.cleanup()

sudo nano /usr/local/bin/backlight.sh

#!/bin/bash

level=$1
#echo "level given is $level"

if [ $# != 1 ]; then
echo "USAGE: $0 brightness_level (0 to 255)"
exit 1
fi

if [[ $level -ge 0 && $level -le 255 ]]; then
#echo "level given is $level"
echo $level > /sys/class/backlight/rpi_backlight/brightness
echo "Screen brightness set to $level."
exit 0
else
echo "Brightness level $level is out of range! (0 to 255 only)"
exit 1
fi

/usr/local/bin/backlight.sh xxx

sudo nano /etc/rc.local

python3 /usr/local/bin/ButtonMonitor.py