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PIR Sensor: false positive detections

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  • 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

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          • 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:-)

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              • 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

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                • 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

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