UPDATE: Replaced my PIR-Sensor with a Doppler Microwave Sensor.

cowboysdude

@uros76 said in UPDATE: Replaced my PIR-Sensor with a Doppler Microwave Sensor.:

@cowboysdude scripts works fine with my pi3.

It seems pi4 has different way of putting a monitor to sleep, I never figured out how to do it on pi4.
Instead, I tested lubuntu on pi4 and managed to put it to sleep with this mouse click script linked to PIR motion:
xdotool click 1
I can share more details on lubuntu setup if needed.

Yes it works great on a Pi3… :) I am still using it for that…

Yes please… I’d like to update the script for Pi4 but haven’t been able to get it working…
Thank you!

uros76

Ok.
So, for a pi4 I managed to get PIR waking up MM screen with these steps:

Install latest Lubuntu with gdm3 environment
Edit /etd/gdm3/custom.conf. This will set autologin so that desktop environment loads every reboot

# Enabling automatic login
  AutomaticLoginEnable = true
  AutomaticLogin = yourusername

Follow these steps to create wakeup script https://www.ketzler.de/2017/12/exit-screensaver-on-raspberry-pi-with-motion-sensor/
Create file “/etc/xdg/autostart/motion.desktop” with the following contents. This runs PIR sensing in the background after every reboot

[Desktop Entry]
Name=motion
Exec=sudo gpio-watch -e rising 4

Set screensaver blank screen to desired timeout, 1min in my case. Lubutu knows how to handle pi4 blanking and puts to sleep my hdmi monitor

This way I got pi4 waking up with PIR sensing. Not ideal setup but it works.
I spent too much time trying to get pi4 work properly with Rapsberian, I simply had too many issues with it.
At the end I am using pi3 for my first production MM and the pi4 is waiting for the next project.

cowboysdude

@uros76 same here. I tried the Pi4 and had issues so I went back to the 3 and all the issues went away… so mine also sits waiting for the next project ;)

Thank you for the info!!!

uros76

Update on my MM setup. I finally took the time and now I have a working microwave sensor using the MMM-NewPIR module to automatically turn off and on LCD screen. For testing, I set the trimpot to 160ohms and it works ok through the normal glass. And this is all working on pi4 (2GB ram) using Rapsberrian. I have no clue why now all the sudden pi4 works just fine. Last week when I was testing I gave up :).

Anyway, so far good and happy with the setup. Now waiting for mirror glass and then setting up the sensor sensitivity and assembly.

Fozi

@uros76 Great to hear that it’s working now!

Philly

@Fozi Hi I was following the steps and everything is working fine I’m using the same pir module as you with the same configuration. But TV when I launch the mirror the screen is blank and at first it meant that the mirror was working and started moving my hand in front of the sensor and nothing. Is it necessary to solder the pins to the sensor for it to activate? If so then that must be my problem. I haven’t seen many other sources of a microwave sensor with raspberry pi only PIR and I would be greatly appreciate for your input.

uros76

@Philly I gave up on PIR as it was giving me too many false-positive reads no matter which type or brand I tried. Simply too unreliable for my taste. And you need to position it in front of mirror glass which doesn’t look good on my slim smart mirror design.
The microwave sensor mentioned in this thread works perfectly for my mirror so far. I had to set the trimmer value a bit higher (close to 180ohm) to get an ideal sensing range. But as you see on the link above, my design has a sensor behind glass.

Fozi

@Philly Sorry for coming back somewhat late, was ill the last few days. Yes you need to solder the pins to the sensor, as they are then connected with Dupont cables to the GPIO on the RPi. Probably the pins are not soldered cleanly and don’t provide electrical contact.

Philly

This post is deleted!

Philly

Hi thank you for responding, I recently bought a soldering iron and soldered the pins to the sensor and I’m still having trouble having it turn on the smart mirror. I’ve attached a picture, I don’t think the module is the problem and made sure the cables are attached to the right pins, could it be the soldering? Sorry to bother I’m new at this.

Fozi

@Philly From what I see in the picture the soldering seems to be OK, but I’m not sure you wired it correctly on the GPIO. The picture is somewhat blurry, so I can’t recognize it well enough.

The red wire should go to the first right pin, which provides +5V. From the picture it seems to go to the first left pin, which provides only 3.3V.
The black wire seems to go to the second right pin, which also provides +5V. It should go to the third right pin for GND.
Finally, the brown wire appears to go to the third left pin, which is provides a SCL signal (serial clock) and is reserved for I2C. Don’t use that, but the forth left pin, which is a digital I/O.
Please check the wireing again according to my description and adjust also the config.js accordingly.

{
			module: 'MMM-PIR-Sensor',
			disabled: false,
			config: {
				sensorPin: 4,
				powerSavingDelay: 30, // (seconds) how long the monitor will be turned on

			}
		},

Philly

@Fozi I rechecked my wires and confirmed they were wired on the correct pins although the picture I sent does look off, the red wire is on the 5v, black is on gnd, and the brown wire is on GPIO pin 7. The config.js is also configured accordingly but when I npm start the Magic Mirror a blank screen continues to show. So I tried using the MMM_PIR module instead and got the same results, a blank screen. Not sure why the sensor’s not working

Ghost2000

@Fozi
You wrote that you are using a double sensor is that this one?

zerodis-HB100-Mikrowelle-Sensor-Modul-Doppler-detecor

Fozi

@Ghost2000 I use this one https://amzn.to/35SEYd3

Ghost2000

@Fozi
then did you connect two?

Fozi

@Ghost2000 no, it is a single sensor. You probably got irritated by the noun „Doppler“. This has nothing to do with double or to similar. The sensor uses an effect which was discovered by the physicist Christian Doppler. See also https://en.m.wikipedia.org/wiki/Doppler_effect

Ghost2000

eah right, now I see

MajorC

Hi @Fozi ,

just to make sure that I am on the right way:

Buy a RCWL-0516 module
Wire the module to my Raspberry Pi 4
Install @Bugsounet MMM-NewPIR on my MM

That’s it? Or did I miss something?
My MM is not a mirror, more a wall-mounted picture frame with some nice to have information on it. I would like to have the monitor turned off, if nobody is in the room.

Thank you,

Christian

Fozi

@MajorC yeah, that are the steps to go. The RCWL-0516 module is a 1:1 replacement of the common IR sensors usually used. MAke sure to follow also the instructions I wrote (see link in my signature).

MickyVi

@fozi

Good morning,

I also used a PIR sensor and obviously, behind the glass it does not work (the glass is 6 mm thick and the back of wood 3 mm), also I do not want it visible as the mirror will be positioned in the bathroom and behind I the power supply, so no wires remain in sight.

At the end of the story I found this topic and I also wanted to change the presence sensor.

I made my purchases as instructed and started testing.

The first test I did without modifying anything, simply connected, installed the MMM-Pir Paviro configured and it immediately started to work.
But I noticed one thing, my sensor is not so sensitive (indeed) I think it depends on those 9 mm total between the size of the mirror and the wooden board, if I move from behind and if I leave it too attached to the tablet wood does not detect anything (it detects only on the back or by moving the mirror from the wall).
I will also try to build a box to keep the sensor a little detached from the wood and let’s see what happens.

Any suggestions on this?

In the meantime, thanks to everyone for the advice and good construction with your MM.

Hello