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    A New Chapter for MagicMirror: The Community Takes the Lead
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    PIR sensor behind glass?

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    • strawberry 3.141S Offline
      strawberry 3.141 Project Sponsor Module Developer
      last edited by

      it will not work behind glass but @alexyak wrote a module for webcams or pi cams to detect motion, which can be hidden behind glass https://forum.magicmirror.builders/topic/490/motion-detector

      Please create a github issue if you need help, so I can keep track

      1 Reply Last reply Reply Quote 1
      • yo-lessY Offline
        yo-less Module Developer
        last edited by

        Thanks man, I am aware of that module, but I’m reluctant to install a webcam in my home that is connected to the internet.

        1 Reply Last reply Reply Quote 0
        • strawberry 3.141S Offline
          strawberry 3.141 Project Sponsor Module Developer
          last edited by

          well you could put your sensor outside of the mirror and hang it into a corner, so it’s not obvious that it belongs to the mirror itself

          Please create a github issue if you need help, so I can keep track

          yo-lessY 1 Reply Last reply Reply Quote 0
          • yo-lessY Offline
            yo-less Module Developer @strawberry 3.141
            last edited by

            @strawberry-3.141 As of now, that would probably be the best option. I’m curious as to what other mirror builders may have done to hide the sensor.
            I’ve tried to find other sensors, such as radar motion detectors, but haven’t yet found one that I could easily attach to my Pi.

            If someone has a radar motion detector or a different way of detecting motion (other than using a webcam) already implemented into their Pi setup, I’d be very interested in finding out more about it.

            Can a PIR sensor be covered by anything at all or does any kind of material automatically block motion detection?

            KnoxK cowboysdudeC 2 Replies Last reply Reply Quote 0
            • KnoxK Offline
              Knox @yo-less
              last edited by

              @yo-less said in PIR sensor behind glass?:

              Can a PIR sensor be covered by anything at all or does any kind of material automatically block motion detection?

              Technically the sensor is covered by something, but that thing is the focusing Fresnel lens. Depending on the PIR you got, you’ll notice the plastic domed lens does come off rather easily.

              “These curved segments are Fresnel lenses which constitute an array that increases the detection zone of the sensor. Fresnel lens array is known to capture more infrared radiation and focus it to a relatively smaller point. Detection is more stable and maximum distance for detection is also increased. Fresnel lens has been crafted to be translucent so that it can capture only infrared radiation without getting unwanted radiations from visible spectrum of light.”

              Now the issue is that most glass and metals reflect IR wavelengths extremely well. So depending what the film/mirror backing is made out of may make your efforts mute. Aluminum which is used in most standard mirrors reflects all of the Infrared light in the spectrum.

              So mounting it behind the mirror just doesn’t seem practical due to the way light works. So what I’m thinking of for me, is to mount it in a light fixture above the mirror. Not sure on the details yet but that’s where I am right now.
              However the Camera trick does function very well and will give you that clean look.

              yo-lessY 1 Reply Last reply Reply Quote 1
              • yo-lessY Offline
                yo-less Module Developer @Knox
                last edited by

                @Knox Yeah, thanks, my Fresnel lens isn’t even fixed to the PIR sensor and comes off right away if you don’t find some way of keeping it there ;-). But you’re right, didn’t think of that, it’s actually covered by this plastic dome. Maybe if I install the PIR sensor in the frame of the mirror and cover that section of the frame with acrylic glass, such as Plexiglas, it might work and look alright. Will try and test if my sensor detects IR behind a sheet of acrylic glass.

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                • KnoxK Offline
                  Knox
                  last edited by

                  that would be a good test, but just note you’ll be lowering its effective area. Which for a mirror might be fine, as you normally stand directly infront of it.

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                  • yo-lessY Offline
                    yo-less Module Developer
                    last edited by

                    Sure, I guess I’d have to play around with its sensitivity, will keep you updated on the outcome of my tests

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                    • RedNaxR Offline
                      RedNax Module Developer
                      last edited by

                      Pir isn’t really an option behind glass. There’s a cam based solution which works through the mirror.

                      That said, my mirror is full sized and the pir peeks out the bottom… You’d never know it’s there unless you know where tot look…

                      CatoC 1 Reply Last reply Reply Quote 0
                      • CatoC Offline
                        Cato Module Developer @RedNax
                        last edited by

                        @RedNax Can you share a picture? 😊

                        RedNaxR 1 Reply Last reply Reply Quote 0
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