So, as in this thread I am trying to use a PIR sensor that powers off my screen via a relay. I’ve had no luck so far. The module MMM-PIR-sensor works nicely as it should, as long as I don’t use relayPIN in the config.js. I also tried doing that via external python scripts, but somehow the relay doesn’t get triggered. Well, it clicks extactly once and that’s it.

Has anyone managed to use a PIR sensor with a relay on a Raspberry Pi 3 B? If so, how did you do that?

Edit: Btw, gpio -g write 27 0 or gpio -g write 27 1 do absoloutly nothing. Wiringpi v 2.44 is installed.

I am currently fighting with the software and I still have to build the frame but I’ll post pictures once everything is done.
I already got my mirror and it is indeed dark. Though, that should be ok as it is a tiny room with a window (our guest toilet).

Edit: I would like to mention the very nice service of Brigla. First, it arrived only 24 hours after I placed the order but the mirror had a minor defect (one tiny spot without refective coating). So I wrote them an email about it yesterday. This morning they replied they would ship another mirror and I don’t have to return the old one. Effectively giving me two for the price of one…
Fun fact: They are only 70km from where I live.

Ok, I did all that and I do get the “…” when I run the pir.py, but the relay doesn’t get triggered. Tried the monitor_oX.sh with and without sudo. Maybe I should just start all over new. Everything seems to be a bit messed up. I reverted back to motion detector only and also that isn’t working anymore in MM.

Edit: Started a new thread here.

Thank you so much!

Two minutes if you know what you’re doing…
The problem is I don’t have a button. I did create the relay.py script and run it. It triggers the relay exactly once and then stays like this. I can’t even stop the script anymore once it’s running…

Man, I really thought setting up the relay would be as easy as adding one line to the config. Wish I had tried to set it up earlier.

Still need help with this. :-(

Thanks so far. I did npm uninstall wiring-pi and installed wiringpi via git. Now I don’t get the error anymore but the relay still does nothing. It’s getting late and won’t have the time today anymore to look into it. Let me know if you have other ideas and I will continue tomorrow.

Thanks so far.

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 .

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.

I don’t think the thickness of the glass influences the transmission as glass itself is very light-transmissive and the reflective layer is just a very thin coating on the glass.

I also think that in a darker room the Mirastar should be better but this is the first time I am dealing with 2-way mirrors…

Hi Tom,

thanks a lot for the tip with Brigla. Haven’t found them before although I was searching the web for a long time already. I have placed an order for the Mirropane Chrome Spy with a transmission of 8%. It is less than 50€ incl. shipping. Pretty amazing price! Almost a third of what I would have paid at Glas-star.de! At least I didn’t burn too much money if that’s not the right mirror. Anyhow, I’d still like to get feedback from other users about their choices. That’s also why I reply in English :-)