Hi,

I’m looking for a monitor right now to use in a PIR setup to save on power. My concern is that the monitor will display “no signal” when the HDMI signal is cut. Should I be worried about this and does anyone know how to get around it?

Thanks,
Steve

Thanks for all the advice and after looking around, I feel that the CEC option is the best one but, unfortunately, is out of my budget. I’ve stumbled across this suggestion which looks like a neat (and cheaper way of getting the same effect.

https://forum.magicmirror.builders/topic/2077/pir-sensor-sleep-lcd-monitor

What’s everyone’s thoughts on it? If it wouldn’t work then could you instead connect to the remote control IR input and force standby that way?

Great idea!

Mine has a power button that you lightly touch and the monitor turns on or off (see pic https://goo.gl/photos/2rnRtovAJpCvTZXp7 ) This means that the button doesn’t have an on or off position. Would this mean that I’d need to get the Pi to send a short pulse to turn the monitor on or off or would it be continuous power to turn it on and no power to put into standby?

Did you manage to avoid having a splash screen when it enters or leaves standby? (See video https://goo.gl/photos/QnGRPccautfSnBCt8 ). This is really important to me!

One idea I thought of is to find an internal wire that provides power to the screen and install a relay there as well. Then run the script as follows;

1. When movement detected activate power relay 1
2. Wait 5s for splash screen to finish
3. Activate power relay 2 which allows power to the screen

Good work on the mirror by the way,
Steve

@Andromede88

Sorry for my lack of understanding but how did you connect the relay to the switch? Also what sort of switch is it?

(http://www.electronicshub.org/switches/)

Keep up the good work,
Steve

Thanks for all the advice and after looking around, I feel that the CEC option is the best one but, unfortunately, is out of my budget. I’ve stumbled across this suggestion which looks like a neat (and cheaper way of getting the same effect.

https://forum.magicmirror.builders/topic/2077/pir-sensor-sleep-lcd-monitor

What’s everyone’s thoughts on it? If it wouldn’t work then could you instead connect to the remote control IR input and force standby that way?

Hi,

I think that you may be trying to achieve the same thing as me. Is your aim to have the Pi send a signal to the power button of the tv screen so that it enters sleep mode? Personally, I think that this is a good solution since it should avoid the “no signal” issue which occurs when the module cuts the HDMI signal.

I assume that you plan to use “relayPIN” option to set the output pin to the tele but how do you determine the correct voltage and signal to send or is it a standard?

As I say, I think that this could be a great way of allowing the mirror to switch the monitor on or off neatly (ie. avoiding splash screens or “no signal” messages). Happy to offer my help in this but, regrettably, I have very little experience or knowledge.

Let me know how you get on,
Steve

Do all HDMI devices respond to these commands or only particular models? If the latter, can you recommend one? Cheers, Steve

Hi,

I’m looking for a monitor right now to use in a PIR setup to save on power. My concern is that the monitor will display “no signal” when the HDMI signal is cut. Should I be worried about this and does anyone know how to get around it?

Thanks,
Steve

Hi,

I’ve searched through the forums and not managed to find an answer. I’m looking to pick up a second hand monitor (they seem cheaper than TVs) and I’d like to use a PIR sensor to turn the monitor on and off. However, when the HDMI output of the Pi is turned off, won’t the monitor display a “No SIgnal” message or even a company splash screen?

Can anyone confirm whether this is a genuine concern and, if so, how to avoid it?

Thanks for your help,
Steve