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    A New Chapter for MagicMirror: The Community Takes the Lead
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    PIR Sensor: false positive detections

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    • FoziF Offline
      Fozi Project Sponsor @MZ-BER
      last edited by

      @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
      • thgmirrorT Offline
        thgmirror
        last edited by thgmirror

        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

        MZ-BERM FoziF 2 Replies Last reply Reply Quote 1
        • MZ-BERM Offline
          MZ-BER @thgmirror
          last edited by

          @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

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          • FoziF Offline
            Fozi Project Sponsor @thgmirror
            last edited by

            @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

            thgmirrorT 1 Reply Last reply Reply Quote 0
            • thgmirrorT Offline
              thgmirror @Fozi
              last edited by

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

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              • Z Offline
                Zoltan @MZ-BER
                last edited by

                @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

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                • Z Offline
                  Zoltan @MZ-BER
                  last edited by

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

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