Want to turn off my monitor

[robmcc83]

Thanks this is very useful information that I didn’t know before.
I have issued the sudo tvservice -o command and it did indeed shut down my monitor.
But what I am trying at the moment is to have it shutdown and wakeup the monitor with a usb webcam now.
That’s what I’m struggling with.
Cheers

[robmcc83]

One interesting thing I like about the second way is it seems easy :) lol.

Would it be possible to say have the screen come on 6-9am in the morning Monday to Friday then come on again 4-10pm as everyone out at work or school during the day. Than say set it so that its on 8am till 10pm on a saturday and sunday when everyone is usually about.

Thanks

[cruunnerr]

Sure, this is possible. For the beginning it seems easy, because u needn’t any optional hardware :)

For your understanding how cronjobs works u should note the following:

* * * * * user executive_command
┬ ┬ ┬ ┬ ┬
│ │ │ │ │
│ │ │ │ └──── Weekday (0-7, Sunday is 0 or 7)
│ │ │ └────── Month (1-12)
│ │ └──────── Day (1-31)
│ └────────── Hour (0-23)
└──────────── Minute (0-59)

So for your special wish ^^it should look like this:

# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user  command
17 *    * * *   root    cd / && run-parts --report /etc/cron.hourly
25 6    * * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6    * * 7   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6    1 * *   root    test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
0 6,16  * * 1,2,3,4,5   root  /home/pi/monitor_on.sh
0 9,22  * * 1,2,3,4,5   root  /home/pi/monitor_off.sh
0 8     * * 6,7   root  /home/pi/monitor_on.sh
0 22    * * 6,7   root  /home/pi/monitor_off.sh
#

Or if you don’t want to create the *.sh files u can also just type the directly command.
Like this:

0 6,16  * * 1,2,3,4,5   root  /usr/bin/tvservice -p
0 9,22  * * 1,2,3,4,5   root  /usr/bin/tvservice -o
0 8     * * 6,7   root  /usr/bin/tvservice -p
0 22    * * 6,7   root  /usr/bin/tvservice -o

Last thing is the extremely easiest way because u just need to modify the crontab. there is nothing else needed at all.
Just put these commands in your crontab and u are done ^^

[robmcc83]

That’s brill your a legend, got a few hours to myself tomorrow so armed with all this information and sure be giving this a try see what the outcome is.
Thank you so much :)

[Mykle1]

@Mykle1 said in Want to turn off my monitor:

{ exec(‘xset dpms force on’, null); }
{ exec(‘xset dpms force off’, null); }

These commands do work. I just tested them on my desktop machine with a monitor connected through DVI and a laptop. Displays are immediately turned off (standby) and on. Here’s the laptop.

https://youtu.be/3ldlUPkw2nM

[robmcc83]

@Mykle1 that’s cool as :) what are you using for the voice command I love that its brill.

[Mykle1]

@robmcc83 said in Want to turn off my monitor:

that’s cool as :) what are you using for the voice command I love that its brill.

https://github.com/mykle1/Hello-Lucy

[Jonae]

@cruunnerr i made your tutorial, works like charm! only problem i found is: replaced print “.”, with: print (“.”), Thenks!

[Jonae]

@Jonae
i encounterd another problem, sometimes after display goes ON the resolution is changed. any ideas why?

[karsten13]

@Jonae

I had similar problems using xrandr for disabling/enabling the monitor.

We did a fix in mm for the above problem (coming with next release) but I don’t know if this fixes your problem too.

You can find the fix in this PR.

[Jonae]

@karsten13 said in Want to turn off my monitor:

@Jonae

I had similar problems using xrandr for disabling/enabling the monitor.

We did a fix in mm for the above problem (coming with next release) but I don’t know if this fixes your problem too.

You can find the fix in this PR.

Thank you, i updated the file, hope for the best :)

[Jonae]

so far so good, no problems. so i can call it a fix for me.

Thanks