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    A New Chapter for MagicMirror: The Community Takes the Lead
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    SmartMirror with 50“ Samsung 4K TV Power Consumption

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    power-savingpowerenergy savingsmart tvmagicmirror2raspberry pi
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    • A Offline
      anthem212
      last edited by

      Hello there,

      My old TV broke. It is Not really good for watching TV anymore but it would still work as a SmartMirror.
      So I wanna build one out of it, this will be my second. My first is a old Tablet.

      I wanna hang in on a Wall with a wooden frame and a Raspery behind it which is doing all the work. Maybe also Touchscreen and voicecommands.

      But I have one question because of the Energieusage.
      I want the TV something like “off” when nobody is walking in front of it or turning it on.
      But when you really turn off a Tv and want to start again it is booting this todays for a while, something like 30 seconds.

      I want this mirror always be ready to show something within one or two seconds when I press a button or walk in front of it. Without booting the TV every time. I also want the screen to go off after 30 seconds with no movement detection or when I press a button.
      So the raspery needs to be running al the time in the background yes but how do I do that with the tv?
      Is there something like a mode between off and on like a black screen or a energy saver which can be turned on and off controlled by the raspery?

      I really don’t want the tv always on showing black Color and burning tons of energy.

      Thank you,

      Best wishes,

      Anthem

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      • S Offline
        sdetweil @anthem212
        last edited by sdetweil

        @anthem212 well there are three commands to turn off the output

        vcgencmd
        dpms

        these two turn off the HDMI port, NOT the monitor/tv

        and cec-client

        this turns off the monitor/tv
        IF it supports the cec command(correctly)

        and then you would need a people sensor,
        most use use infrared, as it’s ‘easy’.

        there are modules that put all this together.

        search here for MMM-PIR

        Now to get your speed requirements will be a little harder. I use TV’s for my two main mirror systems. 43 and 55 in.
        one supports cec, the other doesn’t.
        when I turn off the HDMI port on both, they put up a big NO INPUT screen , and power off after 15 minutes.
        that is energy star compliant.
        but you can’t turn them on via software

        if it supports cec, then maybe you can turn off/on via software. mine is inconsistent. always can turn on, but not off
        on is the same as pushing the button, takes 15 seconds, displays the product logo and all that.

        I gave up, and just hide the mm content and leave the TV’s on. the one in the hall I call the nightlight!

        I also use a webcam for motion detection, instead of pir, cause that’s what I had at the time

        as yours is a 4k tv, I’m guessing it supports cec

        install the cec-utils package on pi
        sudo apt install cec-utils

        this also only works on my pi 4. not pi3.

        Sam

        How to add modules

        learning how to use browser developers window for css changes

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