Read the statement by Michael Teeuw here.
PIR Sensor: false positive detections
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@zoltan Really nice build!Congrats!
Yeah, a low-pass filter can solve the interferences from the WiFi module, too, of course. But due to my lazyness and impatience I sacrificed an old VGA cable and re-used the ferrite bead:beaming_face_with_smiling_eyes: -
Hey folks - thanks for your answers. I decided to goahed with a RCWL-0516. But have the same issues. I’m testing the sensitivity with a python script. I also covered it in alu foil - no change. Now I ordered a ferrite beat and will add to the cables (around all of the them or only GND, 5v or Output?)
I’m also thinking about adding a low pass filter, but I have no experience with that. Where do I have to add that? GND & Output?
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@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. -
@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?
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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?
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@mz-ber If you remove the resistor completely without any replacement the sensor won’t work any more.
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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 -
@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
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@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:
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@fozi no, currently no 3D-printing, but may be in the future:-)
