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A New Chapter for MagicMirror: The Community Takes the Lead
Read the statement by Michael Teeuw here.

PIR Sensor: false positive detections

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  • F Offline
    Fozi Project Sponsor @MZ-BER
    last edited by Nov 22, 2021, 3:25 PM

    @mz-ber Just put all wires through the bead.
    With the RCWL-0516 you should note that they can be very sensitive (up to 7m on free sight) and detect motion even through walls. First I went the alu foil route, too, but then modded my RCWL-0516 with a trimmer. Now the mirror is triggered when I approach the mirror less than 1m. Check the link in my signature for details, if you like.

    HowTo: Replace PIR Sensor with a RCWL-0516 Microwave Sensor

    M 1 Reply Last reply Nov 22, 2021, 4:39 PM Reply Quote 0
    • M Offline
      MZ-BER @Fozi
      last edited by Nov 22, 2021, 4:39 PM

      @fozi Yes! I followed your instructions in detail - that was very helpful. And yes, I noticed how sensitive it is. In your tutorial you removed the the tiny SMD resistor soldered and replaced that. What if I just remove it and not replace it. Is the range than completely gone and doesent work anymore?

      F 1 Reply Last reply Nov 22, 2021, 6:00 PM Reply Quote 0
      • M Offline
        MZ-BER @Zoltan
        last edited by MZ-BER Nov 22, 2021, 6:52 PM Nov 22, 2021, 4:49 PM

        Hi @zoltan - I was reviewing your tutorial. Really good documented. I have a question about the wiring drawing you shared. I’m new to it and dont understand everything. But I’m a fast learner :-)

        In your drawing you added a couple of symbols. I guess these are resistors and filters, right?

        Numbers 1, 2 and 3 look similar, only with a diffrent capacity. Is that a Capacitor?
        What are 4 and 5? Is that a conductor? What capacity is here needed?
        And number 6, not sure. Is that a RND or a resistor?

        592b9840-5b90-4d92-9bd3-b79a1f1176ad-image.png

        Z 2 Replies Last reply Dec 3, 2021, 4:00 PM Reply Quote 0
        • F Offline
          Fozi Project Sponsor @MZ-BER
          last edited by Nov 22, 2021, 6:00 PM

          @mz-ber If you remove the resistor completely without any replacement the sensor won’t work any more.

          HowTo: Replace PIR Sensor with a RCWL-0516 Microwave Sensor

          1 Reply Last reply Reply Quote 0
          • T Offline
            thgmirror
            last edited by thgmirror Nov 22, 2021, 6:02 PM Nov 22, 2021, 6:01 PM

            Didn’t I said, I’m not an electrician?
            It is not a step-down/up … it is called Pull-Up, resp Pull-Down.
            Please see here for detailed (german) explanation: https://www.elektronik-kompendium.de/sites/raspberry-pi/2006051.htm

            M F 2 Replies Last reply Nov 22, 2021, 6:50 PM Reply Quote 1
            • M Offline
              MZ-BER @thgmirror
              last edited by Nov 22, 2021, 6:50 PM

              @thgmirror Yep, that is what I’ll do next. Already ordered a starter kit with resistors, inductors and capacitors.

              I also noticed, even if I added the ferrite beat, that the sensor recevied every minute excact on the second a signal

              c06e06b8-0380-4a64-a040-2ef29f7c68ee-image.png

              1 Reply Last reply Reply Quote 0
              • F Offline
                Fozi Project Sponsor @thgmirror
                last edited by Nov 23, 2021, 7:43 AM

                @thgmirror said in PIR Sensor: false positive detections:

                It is not a step-down/up … it is called Pull-Up, resp Pull-Down.

                Are you dealing with 3D printing? Just asking, because step-down converters are quite popular for modding cooling fans in that hobby :beaming_face_with_smiling_eyes:

                HowTo: Replace PIR Sensor with a RCWL-0516 Microwave Sensor

                T 1 Reply Last reply Nov 23, 2021, 9:13 AM Reply Quote 0
                • T Offline
                  thgmirror @Fozi
                  last edited by Nov 23, 2021, 9:13 AM

                  @fozi no, currently no 3D-printing, but may be in the future:-)

                  1 Reply Last reply Reply Quote 0
                  • Z Offline
                    Zoltan @MZ-BER
                    last edited by Dec 3, 2021, 4:00 PM

                    @mz-ber
                    Apologies for the late response
                    1, 2 and 3 is capacitors yes
                    4 & 5 is inductors or coils. The rule is a Capacitor conduct high frequency but block low frequency. The coil or inductor is doing the opposite, and conduct low frequency but block high frequency. The whole idea is to short circuit any spikes on the power line as well as the data line to ground. This is quite a big low pass filter and you can make it smaller with less components.
                    Remove 1
                    Leave 4 & 2
                    Replace 5 with a wire

                    6 is a resister yes. 10 Kilo Ohm 1/4 watt is perfect

                    The coils you can strip out of an old circuit board. If it looks like a wire wind coil and it measure less than 3 ohm then its perfect

                    1 Reply Last reply Reply Quote 0
                    • Z Offline
                      Zoltan @MZ-BER
                      last edited by Dec 3, 2021, 4:07 PM

                      @mz-ber
                      The controller board with the low pass filter
                      Screenshot_20211203-180312_Gallery.jpg

                      1 Reply Last reply Reply Quote 0
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