💬 EASY PIR multisensors box

[Nca78]

@koresh said in 💬 EASY PIR multisensors box:

@nca78 I bought these sensors for prototype boards in the local store ( http://www.pcmount.by/catalog/radiokomponenty/mikroshemy/ic-pir-s16-l201d )

For information for all those who like me are a bit far from this "local" store. I made a procurement request on LCSC.com for 10 sensors (S16-L221D-2) and they charge me a bit less than 1$ for each, so with Singapore Post shipping it's less than 14$, 1.4$ per sensor.
Senba was ok to send me some samples for free but I had to pay 20$ for DHL shipping, so this is much more interesting :)

[scalz]

and here an eval board that you can find in others shops too.
For those who don't want to solder it ;)
https://www.seeedstudio.com/Grove-mini-PIR-motion-sensor-p-2930.html

[NeverDie]

Interesting. Its small size is an attractive feature.

I'd be curious to know though how well it detects compared to the am612 and it's larger PIR lens. IIRC, the small lens on the am312 didn't do so well....

[gohan]

@scalz wow 5$ each? 😱

[scalz]

@NeverDie
I can't tell you about this PIR ic. I'm not using it.
I don't think they're all equal. Shops selling these eval boards mention short range with this lens type. But it can be due to the PIR&lens.
I prefer TO5 PIR for multiple reason (but it's less handy when mecha constraints). One of them is you have more choice for lens and focal. I'm not sure if using a bigger lens with a smd PIR like this one, wouldn't break the recommanded focal, and thus degrade fov or range..

@gohan I just showed a seeed link, i'm not advicing anything ;) But, 5$, a lot.. really?? Here I'm not spending 5bucks for PIR ic, a bit less. But you would use 10 modules for a house, that would be 50 bucks.. personally I'm not shocked, it's price for some commercial devices. I know xia**i have cheap hw, but are their PIR devices more than just PIR..
Of course i can understand 5$ can be a lot, depends where you live then.

[gohan]

Nca78 is buying the bare sensor for 1$ as a end user, so to me 4$ for a pcb and a connector is overpriced
Xiaomi PIR sensors are zigbee devices, so you shoud compare them to a normal pro mini pir sensor with nrf24 and an etra light sensor.

[scalz]

@gohan said in 💬 EASY PIR multisensors box:

Nca78 is buying the bare sensor for 1$ as a end user, so to me 4$ for a pcb and a connector is overpriced
Xiaomi PIR sensors are zigbee devices, so you shoud compare them to a normal pro mini pir sensor with nrf24 and an etra light sensor.

calc is wrong :) Nca is buying it for 1.4$, the unsoldered bare sensor only..
then for 4$ you get the lens, a few components+connector, pcb, soldered/assembled.. maybe you'll find for cheaper in aliexpress in future. "Overpriced" like you said, perhaps.. but not that much I think. People need to do benefits, run their company etc to live.. Plus, for example seeed has degressive price with quantity.
Just that sometimes, I feel nowadays people would like things for almost free. Poor people workers assembling stuff for peanuts, not cool, or locals decentralizing.. but I don't want to debate on this.

Sorry for OT @koresh, cute board btw, nice work :+1:

[Nca78]

I think they buy it for cheaper than my 10 parts at 0.95$. But except for that I agree with @scalz : they paid some guy to watch the market for new sensors, order this one and test it, another one to design a PCB, test/solder some prototypes and test again, take some photographs of the final product, make the online form & PDF documentation, get it produced and stocked.
Not huge sums but I don't think they will sell x0 000 units like the cheap ass breakout boards on AliExpress/Ebay, so they have to get back the investment and make a decent margin, too.

[NeverDie]

@gohan For instance if I wanted to answer my own question and test it to check how well it detects, I'd probably order the breakout that Scalz pointed to, or perhaps one like it if I could find one with cheap shipping, and run the test. It would cost me more, especially in time, to make it from scratch.

On the other hand, if I were making a very small batch of fully complete PIR sensors with enclosure and batteries and everything else for use at my house, I maybe wouldn't use it. Or, maybe I would. Not really sure. I haven't looked into how hard it might be solder it, especially without contaminating the detector from flux fumes or the like or maybe ruining it with an IPA wash afterward.

Overall, I still think it's an interesting breakout, and a big thank you to @scalz for pointing it out.

:)

Also, regarding the OP, I like that @Koresh 's design is so small. That's not easy!

[Koresh]

And final version of the enclosure :smiley:

It also has rubber 3d printed parts to protect the board from the environment but allow the sensor to work properly. Will show it later.

[yury]

ESUN flex filament used.