PIR am312
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So I guess this may mean we won't be using the bangood sensors after all. Instead we'll be buying chips and mounting them to custom PCB's, like NCA78 is doing. That is, unless there's a better lens cap that just naturally fits the body of the banggood sensor.
Which means I should order some of those PIR sensor IC's soon, given the long shipping lead times.
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For a preliminary POC, I made a lens holder with cardboard and hot glue:
and drilled a 15/32" hole in the middle for the PIR element, which I shoved in the back:
Obviously it's still crude, but it's better than my first attempt. It also performs better. It still has spotty coverage, but not as bad as before. Obviously a more properly installed and aligned lens should perform better still.
Anyhow, that's as far as I'm going to take it for now. I look forward to hearing what others might come up with, as well as their impressions about the coverage.
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I did. What you see is just the holder that the regular lens snaps onto.
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Here is my version of a holder. It is for the bigger PIR. But it holds a dhtXX, ds18b20, and a light sensor as well.
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Nice!
On my holder, the sensor depth is presumably wrong from a focusing point of view--at least if the SR501 is a proper guide for how it should be done. The sensor should really be deeper into the cavity. I suppose that alone might make a meaningful improvement. Alas, I think that may call for mounting the sensor element onto a PCB, so that it sits flush on top.
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@Nca78
Have you worked out the dimensions for the four holes that the SR501 lens fits into? I'm guessing so, given your shield above. I could of course try measuring the distances with a micrometer and the hole diameters with some gauged wire, but it might take a few PCB iterations to get it right. However, if you know the exact hole diameter and distance between the holes, it would be helpful if you shared that info so that we can get cracking on making custom PCB's that incorporate it. -
Searched a bit and found this. Guess my measurements were a bit off, hope it will fit with 17.4 and a bit over 22...
I should have searched while doing the PCB :DReal measurements are 17.5mm and 23.3-1.45 = 21.85
I ran a banggood PIR sensor off my 3.3v boosted 10F supercap solar node last night and, as you would expect, the extra load was so low that it's practically a rounding error. :) These PIR's would have no problem being powered for days from a supercap.
@Nca78 I guess what you're calling "sensibility" on your board above is another name for sensitivity? i.e. you figured out how to adjust the sensitivity of the PIR detector? That's something not obviously accessible on the banggood PIR's, as they don't seem to come with a sensitivity adjustment. If you've already figured out how to adjust the sensitivity, would you mind sharing the schematic? It might help us avoid re-inventing the wheel if we were to follow the path you've already blazed.
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I ran a banggood PIR sensor off my 3.3v boosted 10F supercap solar node last night and, as you would expect, the extra load was so low that it's practically a rounding error. :) These PIR's would have no problem being powered for days from a supercap.
@Nca78 I guess what you're calling "sensibility" on your board above is another name for sensitivity? i.e. you figured out how to adjust the sensitivity of the PIR detector? That's something not obviously accessible on the banggood PIR's, as they don't seem to come with a sensitivity adjustment. If you've already figured out how to adjust the sensitivity, would you mind sharing the schematic? It might help us avoid re-inventing the wheel if we were to follow the path you've already blazed.
@NeverDie haha yes it's the sensitivity sorry sometimes my English fails and I mix with French words :D
I will fix on the PCB.This can be set only on am612, I bought the sensor only (no breakout board) on AliExpress. It has 6 pins for the extra settings instead of the 3 of the am312.
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@NeverDie haha yes it's the sensitivity sorry sometimes my English fails and I mix with French words :D
I will fix on the PCB.This can be set only on am612, I bought the sensor only (no breakout board) on AliExpress. It has 6 pins for the extra settings instead of the 3 of the am312.
@NeverDie haha yes it's the sensitivity sorry sometimes my English fails and I mix with French words :D
I will fix on the PCB.This can be set only on am612, I bought the sensor only (no breakout board) on AliExpress. It has 6 pins for the extra settings instead of the 3 of the am312.
Good to know. Does it draw the same or comparable amount of current as the am312? If so, you've just saved me from ordering the wrong sensor! :)
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@NeverDie haha yes it's the sensitivity sorry sometimes my English fails and I mix with French words :D
I will fix on the PCB.This can be set only on am612, I bought the sensor only (no breakout board) on AliExpress. It has 6 pins for the extra settings instead of the 3 of the am312.
Good to know. Does it draw the same or comparable amount of current as the am312? If so, you've just saved me from ordering the wrong sensor! :)
Good to know. Does it draw the same or comparable amount of current as the am312? If so, you've just saved me from ordering the wrong sensor! :)
The datasheets are similar for everything that is not related to the extra pins of course: same electrical specs, same detection profile, ... My guess is it's the same PIR sensor but on am312 some of the settings are just hardwired inside the "can".
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Cool! I'm going to follow your lead and order some of the am612's then. Thanks for the heads up!
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Not sure if this is the same as the SR501 lens. Really hard to tell from the photo:
https://www.aliexpress.com/item-img/5Pcs-Lot-PIR-human-body-infrared-sensor-lens-Mini-lens-high-quality/32563535500.html?spm=2114.10010108.1000017.1.oavh25
If anyone finds a confirmed source for SR501 lenses, please post.
