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

[Fozi]

@cowboysdude
You only use Vin (5V), Vout and GND. CDS (for applying a photo diode) and 3V3 (delivers 3.3V output) remain unused. For Vout you can use also oher GPIO pins (labeled “Digital I/O” in the 2nd diagram), in case GPIO_4 is already used.

The ferrite bead is optional. It is a left over from the PIR sensor I had attached. If you may need one, you can dismantle an old VGA cable and use that one.
Here the wireing diagram:

[cowboysdude]

Super Awesome yet again!! Thank you! I don’t use the PIR module… I have a Python script I run behind everything. It works very well for me but this will work so nice, and now I can move it behind the glass!

Now if I can just remember where I put my ferrite beads… I know I have some … but where LOL

[Fozi]

Hi folks,

sooner than expected I modified the sensor with a trimmer resistor.
For that I also updated my initial post and enhanced the tutorial, where now both options are described. Enjoy and give me your feedback, how that works for you.

[sdetweil]

@Fozi nice update… very clear and helpful

[cowboysdude]

Once again excellent work! I love the trimmer it’s a great idea for those with limited space!
For some strange reason I have left a gap at the top of my mirror that fits what I build perfectly!
I wanted a bigger mirror so I bought the glass oversized and centered the monitor in it :)

This, accidently, left me enough room to fit this in perfectly!

So what I did was design a “T” with a whole in it to mount the sensor and install it inside the box.
I am a contractor so having aluminum tape was not a hard thing for me to come up with.

Thank you @Fozi for this entire project! Allows me to get rid of the ugly PIR sensor outside the mirror and place a sensor behind the scenes but works as intended.

So for me option 1 works great! This won’t work for everyone but in my case perfect!
[Have NOT installed it in the mirror yet but will today]

Here’s the pictures.

Box

3d PLA Printed ‘T’

Fits inside of box

Picture of sensor on ‘T’

Once again, Thank you @Fozi !!!

[Mykle1]

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

sooner than expected I modified the sensor with a trimmer resistor.
For that I also updated my initial post and enhanced the tutorial, where now both options are described.

Dude, (can I call you dude?) although I don’t use a sensor (I have a cam on my first mirror w/Pi) I appreciate what you’ve done here. I’ll say it again (in different words), I think this is the death knell of the PIR sensor. So, thanks. :thumbsup:

Peace!

[Fozi]

@cowboysdude I‘m totally happy that I cold help and to receive so positive feedback! I love it when a plan works!😁 Thanks!
This T-shaped holder, is it 3D-printed or an off-the-shelf available part? It‘s totally cool!

[Fozi]

@Mykle1 said

Dude, (can I call you dude?) although I don’t use a sensor (I have a cam on my first mirror w/Pi) I appreciate what you’ve done here. I’ll say it again (in different words), I think this is the death knell of the PIR sensor. So, thanks. :thumbsup:

Sure, call me Dude, if you like😁

Let‘s get the warts outta here!🤣 and thanks for the overwhelming feedback!

[cowboysdude]

Ok so here’s my final and it’s working perfectly! I tried it in various spots.

Thanks to @Fozi again…now there’s a very complete forum topic that anyone can follow!!

I added 2 additional layers of aluminum tape… there are no untaped spaces on the box anywhere… then moved it to the back of the cabinet and now you have to walk up to it to make it come on… PERFECT!! :)

I tried behind the glass… too sensitive
I tried taped to the back of the monitor … too sensitive.
Moved to the back of the cabinet which makes it about 4" away from the glass… BINGO!!

[PS… don’t mind my ugly wiring LOL]

[Fozi]

@cowboysdude Great News, excellent!👍🏻

[lavolp3]

@cowboysdude
am I seeing it right that also the side of the case looking at you is aluminium taped?
So the whole case is taped in your case?

[lavolp3]

@cowboysdude @Fozi Guys, which module are you using for the recognition?
I can’t get neither MMM-PIR-Sensor nor MMM-PIR to work currently. Both have the same problem with epoll which is installed via the node module “onoff”, if I see correctly.
What are you using?
THe mirror won’t load with any of the modules activated giving the error

 The module '/home/pi/MagicMirror/modules/MMM-PIR/node_modules/onoff/node_modules/epoll/build/Release/epoll.node'
was compiled against a different Node.js version using
NODE_MODULE_VERSION 67. This version of Node.js requires
NODE_MODULE_VERSION 64. Please try re-compiling or re-installing
the module (for instance, using `npm rebuild` or `npm install`).

@cowboysdude I remember you’re using your own script?
@Fozi you?

node v 11.4.0
npm v 6.13.0

[cowboysdude]

@lavolp3 I use my own for that… it’s not a module but it’s right here.

https://github.com/cowboysdude/Pir-Sensor

Easy to follow :)

The box is just a cardboard box taped with alum duct tape. I am however waiting for my trimmer resister so I can tune it down and take it out of the box. I only want the mirror to come on when someone walks up to it…say like 2 ft. away… so it doesn’t come on when I walk by the bathroom doorway… looks more like a pro thing :)

[Fozi]

@lavolp3 I use MMM-PIR-Sensor without any modifications. Are you using @paviro master oder any other fork of the module?
As I see, you have more recent npm/node versions installed.
I am still on node 10.17.0 / npm 6.11.3.

Edit: I’d recommend to try the script from @cowboysdude . It is robust against any node.js stuff as it written in python.

[Norton]

This post is deleted!

[Fozi]

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

It is important to replace the PIR sensor with a Doppler Microwave Sensor.

This spam bot is sooo right!:face_with_tears_of_joy:

[bachoo786]

@Fozi Hi
Can i solder pin 1 and 2 of the resistor to the radar sensor? I accidentally broke pin no 3.

[Fozi]

@bachoo786 yes, you can also use pin 1 and 2.

An example:
The max value of the resistor (Rmax) is between pin 1 and 3.
Between pin 1 and 2 is the restitor value R1, and
between pin 2 and 3 is the resistor value R2.

Rmax = R1 + R2. (or R1=Rmax - R2, resp, R2=Rmax - R1)

Thus, you can use both options (R1 pin 1/2 or R2 pin 2/3).

[bachoo786]

@Fozi so I got a new radar sensor set the resistance to 80ohms which would give me around 40 to 50cm detection distance. I am using @cowboysdude script.

My mm is running on my rpi 4b 4g and at present its connected to my TV. However the rada sensor is not working as the script is meant to detect motion and if there is no motion it would turn the tv off after 20 seconds. I tried many times but have failed.

Any ideas? Or maybe my sensor is not working. Is there a simple script that I could test the sensor?

Thanks.

[Fozi]

@bachoo786 First re-check if the sensor is cabled correctly to the GPIO as described in my tutorial. Further check if the resistor is soldered correctly to the sensor. Maybe there is a “cold soldering joint”. Sounds trivial, but the devil is a squirrel (old german saying )
Then, extend the detection range to the max, to check if the sensor is generally OK (200 Ohms) and re-run @cowboysdude script. If this works, then reduce the resistor step by step until you reach the desired detection range. Theoretically 80 Ohms should provide a range of 40-50 cm, but from my experience this may vary strongly as the resistor value does not correspond linearly to the detection range.