{HowTo} turn on/off your monitor (Time based, PIR/Button, App)

[Peter]

Nice tutorial!
Time to connect the Pir to the Pi.
Thanks!
Peter

[cruunnerr]

@nikobelohlav @ninjabreadman

Alright, i add this option to the tutorial. Hope you enjoy :)

If there are any suggestions on the scripts i am using please tell me. I am not a programmer so it could be, that the scripts aren’t as “clean” as they could be.

[OdomLinx]

8. disable the HDMI port with

vcgencmd display_power 0

and enable with

vcgencmd display_power 1

Most monitors then go into standby. Some also show ‘NO Signal’.

[E3V3A]

@OdomLinx copy paste error?

[OdomLinx]

@E3V3A Yes copy paste error, I adjusted it

[E3V3A]

Most modern monitors also have a PowerSave function that completely turn off the monitor when there is no HDMI signal, after a set amount of time. So I guess experimentation will be needed as to what really happen after you have turned it off using either:

1. vcgencmd display_power 0
2. sudo tvservice -o
3. DISPLAY=:0 xset dpms force off (Notice, it’s not necessary to export!)
4. xset -display :0 dpms force off

The first 2 turn off HDMI and most likely put your monitor into PowerSave mode, eventually.
The last 2 only blanks the screen (visible when dark), and does not disable HDMI signals.

[ninjabreadman]

@E3V3A Some monitors, but almost all television displays turn off after delay (and then cannot be woken in software).

That, and some folks have complained that they can’t hear a podcast or Alexa because their integrated speakers turn off when the monitor is in powersaving.

You’re right, it takes some experimentation to tailor to a given use case/situation depending on requirements.

[MadScientist]

I would like to use the MMM-PIR-sensor module to trigger the relay to power off the LCD. However, whenever I set
relayPIN: 27, in the config.js, the motion detector doesn’t do anything anymore. Anyone know what else I have to change in the config? It’s working just fine without the relay.

Config working without relay (switches off HDMI):

                {
                module: 'MMM-PIR-Sensor',
                config: {
                        sensorPIN: 22, 
                        relayPIN: false,
                        powerSaving: true,
                        }
                },

Not working with relay:

                {
                module: 'MMM-PIR-Sensor',
                config: {
                        sensorPIN: 22,
                        relayPIN: 27,
                        relayOnState: 1,
                        powerSaving: true,
                        }
                },

The problem is I am using a V59 LCD controller board which doesn’t power on again once the HDMI is re-activated.

[cruunnerr]

1. Can u turn on GPIO27 with gpio -g write 27 1 and off with gpio -g write 27 0 ?
2. Have u tried just to connect a LED on GPIO27 ?
3. What relay do u use and how exactly is it connected? ?

[MadScientist]

Hmm, I get

Unable to determine hardware version. I see: Hardware   : BCM2835
,
 - expecting BCM2708 or BCM2709. Please report this to projects@drogon.net

when I run gpio -g write 27 1 .