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    how to adjust brightness based on time on RPi3?

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    • L Offline
      lkthomas
      last edited by

      I want to adjust brightness to 100% during day time and 20% at night, how could I do that with RPi3?

      ? I 2 Replies Last reply Reply Quote 0
      • ? Offline
        A Former User @lkthomas
        last edited by A Former User

        @lkthomas
        For official 7" LCD Screen, echo 32 > /sys/class/backlight/rpi_backlight/brightness will work.
        For common monitors, as far as I know, debian has xbacklightbut I’m not sure it will work on RPI also.

        L 1 Reply Last reply Reply Quote 0
        • L Offline
          lkthomas @Guest
          last edited by

          @sean

          pi@raspberrypi:~/MagicMirror/config $ xbacklight
          RANDR Query Version returned error -1

          no, doesn’t work in RPi3

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          • I Offline
            ianperrin @lkthomas
            last edited by

            @lkthomas take a look at MMM=ModuleScheduler. It contains a method for dimming modules.

            Once installed, adding something like this should to your config.js should work

                {
                    module: 'MMM-ModuleScheduler',
                    config: {
                        // SHOW ALL MODULES AT FULL BRIGHTNESS AT 06:00 AND DIM THEM TO 20% AT 22:00
                        global_schedule: {from: '0 6 * * *', to: '0 22 * * *', dimLevel: '20' },
                    }
                },

            "Live as if you were to die tomorrow. Learn as if you were to live forever." - Mahatma Gandhi

            L 1 Reply Last reply Reply Quote 0
            • L Offline
              lkthomas @ianperrin
              last edited by

              @ianperrin just tested, dimlevel at 20 and 80 also show black screen

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              • I Offline
                ianperrin @lkthomas
                last edited by

                @lkthomas okay, a couple of things to check

                1. Have you installed the module and its dependencies as per the instructions
                2. Did you restart MM after installing and changing the config.js file.

                With the config above place at the end of modules section you should see the following lines in the log.

                MMM-ModuleScheduler is removing all scheduled jobs
                MMM-ModuleScheduler received CREATE_GLOBAL_SCHEDULE
                MMM-ModuleScheduler is creating a global schedule for all modules using "0 6 * * *" and "0 22 * * *" with dim level 20
                MMM-ModuleScheduler has created the global schedule for all modules
                MMM-ModuleScheduler will next show all modules at Sun Jan 13 2019 06:00:00 GMT+0000 (UTC)
                MMM-ModuleScheduler will next dim all modules at Sat Jan 12 2019 22:00:00 GMT+0000 (UTC)
                

                Whilst testing, you could use the following config to toggle the brightness more frequently (i.e. every two minutes):

                        {
                            module: 'MMM-ModuleScheduler',
                            config: {
                                global_schedule: {from: '0-59/4 * * * *', to: '2-59/4 * * * *', dimLevel: '20' },
                            }
                        },
                

                Let us know how you get on.

                "Live as if you were to die tomorrow. Learn as if you were to live forever." - Mahatma Gandhi

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                • L Offline
                  lkthomas
                  last edited by

                  all good! thanks, I missed the dependencies installation section.

                  1 Reply Last reply Reply Quote 1
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