Read the statement by Michael Teeuw here.
PIR sensor behind glass?
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@yo-less said in PIR sensor behind glass?:
@cowboysdude We might just drill a tiny hole into the frame of the mirror and put the PIR behind it without its Fresnel cover. Will experiment with that idea some more.
That’s the approach I was thinking of. Which PIR will you use?
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@yawns I’ve got the HC-SR501 / D-SUN RCW-0506 and it’s working as it should.
I paid €8 for two sensors and shipping to Germany. The one in use even survived my failed attempts at connecting it to the correct pins :). -
I just like the camera… it’s a personal choice :) But drilling a hole will work too!! I don’t see a thing wrong with that!
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@cowboysdude I’m just not comfortable with the idea of a camera in my bathroom (or any other room, for that matter). Raspbian is a pretty open platform and I don’t want others to take control of any cameras I might have installed in my home. And it’s not like all sorts of people wouldn’t be interested in spying on other people.
Have started experimenting with the PIR sensor, it’s looking good so far, will let you guys know about my progress.
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Another possibility: I ordered a couple of these $2 microwave radar motion detectors to see if they will work behind my glass. Still waiting to receive them though:
More details:
http://www.cnx-software.com/2016/04/04/tiny-microwave-radar-module-detects-movements-up-to-9-meters-away-for-2/amp/ -
Wow, the microwave approach sounds good. Will this work behind the mirror?
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@dmcinnes Thanks for your link, I’m using a radar module in a Pi-independent LED lighting control unit that a friend of mine put together (So I have no clue how his circuits actually work, but they do and that’s great :D), which is why my first impulse was to use a radar motion detector as well.
I couldn’t find any that operated within the voltage specifications of the PI’s pins. Your link lists a working voltage range of 5.5 - 18 V DC, but the Pi only offers 5 V DC, doesn’t it?
So are you planning on using an external power source for your module?
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Hmm I’ve seen othe specs that say working voltage is 3.3-20VDC… hopefully that’s more accurate. In any case I’ll try it with the 5V from the PI and go from there.
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@yawns I’ve read that microwave sensors will work behind glass, but I’m not sure if it will work behind the semi-mirrored surfaces we’re using.
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@dmcinnes It’s great that you’re experimenting with this in any case. Please let us know the outcome once the sensor has arrived.
