Read the statement by Michael Teeuw here.
SmartMirror with 50“ Samsung 4K TV Power Consumption
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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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@anthem212 well there are three commands to turn off the output
vcgencmd
dpmsthese 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 softwareif 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-utilsthis also only works on my pi 4. not pi3.