Clean looking sensor node
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I have to agree that sitting side by side, yours does look nicer. Nice find!
At least with my wife anything which has a protruding wire gets low WAF. I have to agree with her on that. You can curl the wire and fit it inside the case. You'll lose some signal strength, but that's why I opted for the RFM69HW, which has plenty of link budget. Etching an antenna starts to get complicated if you want it to work well.
Last night I found a square version of the solar puck that was all plastic (i.e. no metal band around it). However, if you don't like the look of a solar cell on top, it would be a non-starter for you.
In general, though, I think your idea of re-using the case of some well crafted looking product is the way to go. I suppose 3D printing something might work, but I'm not equipped for that, and let's face it: it takes both time and talent to make something from scratch which also looks nice. Even companies like Apple I'm sure go through a lot of iterations, and those are full-time professionals who specialize in that.
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From what I have seen 3D printing cannot produce such a polished look, at least not with the entry level machines. So you need polishing and/or coating to have something good looking. It's good for POC but for a good product you need plastic molding and for that to be reasonnable in price you need.
For the antenna it will be fixed with the dedicated PCB, the PCB antenna of the NRF24 will fit inside the box.
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@Nca78 said:
such a polished look
Actually it can have that look if you print with ABS and treat it with acetone vapor afterwards.
For example look at these picturesHave treated my prints that way many times and the result is very good.
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If anyone else has suggestions on good looking cases to use, please do post them to this thread. This will be an easier search if we pool our knowledge.
Meanwhile, I think I'll order one of the same charging pads as the OP so as to try it out. It's actually cheaper than many of the much worse looking project boxes, so thanks for posting the links.
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@Nca78
I just ordered both charger pads that you had linked to. They should arrive in about a month, and then I'll give them a try.You can save on both size and thickness by using a surface mount NRF24L01. Gert Sanders already has a node like that he has posted.
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@Nca78 said:
. No way to put a jmodule inside so I went for an EasyPCB ...
By the way, what is an "EasyPCB"?
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@NeverDie said:
By the way, what is an "EasyPCB"?
https://www.openhardware.io/view/4/EasyNewbie-PCB-for-MySensors
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@mfalkvidd
Thanks for the link. I had thought it might be a new easy way to create PCB's at home from scratch, but it's totally different from that. It looks good for its own merits though.
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Inspired by the OP's original post, I notice that if I do a search on "power bank case" (e.g. https://www.aliexpress.com/af/power%2Bbank%2Bcase/6.html?site=glo&g=y&SortType=price_asc&SearchText=power+bank+case&isAffiliate=y&initiative_id=SB_20161013135103&needQuery=n&isFreeShip=y), it turns up a lot of possible low cost cases (which may or not be to your taste, but as you go up in price, the fit and finish also improves). Example links for a couple inexpensive ones are:
Of interest to me are ones like the second link that are already designed to hold two cells, because I envision that is what I would probably use for most nodes that run on battery. For a node that's meant to run from a usb charger, the first one (or similar) might be fine and could probably be adapted for that purpose.
Last December I got a very nice power bank, which was on-sale at Amazon for just $6.50, including Prime Shipping:
https://www.amazon.com/gp/product/B00NUS0BQW/ref=od_aui_detailpages00?ie=UTF8&psc=1
It even came with rechargeable lithium batteries already installed, and for what it does it works quite well. If I could find just a case like that but priced even lower, I'd probably get it.Here's one that's not as attractive, but it is lower priced, and it clearly has space for both batteries and for a wireless sensor module:
https://www.aliexpress.com/item/Consumer-Electronics-Shop-Free-shipping-For-iPhone-LED-5x-18650-Dual-USB-Power-Bank-Battery-Charger/32600920016.html?spm=2114.30010308.3.179.KlmmHY&ws_ab_test=searchweb0_0,searchweb201602_5_10065_10068_10067_10069_10017_10080_10082_10081_10060_10061_10062_10056_10055_10054_10059_10078_10079_10073_10070_421_420_10052_10053_10050_10051,searchweb201603_4&btsid=532dcd62-0435-446f-a697-950ed308b3ab
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@NeverDie yes you are right the SMD version of NRF24 is the way to go, there is not way to fit both a regular sized NRF24 and a non SMD atmega. SMD NRF24 is not too hard to solder so it's the better compromise. I can fit it with pro mini and CR2032 on the available space for the black charger.
For the other one outside thickness is 8.7mm only, and to that you have to remove the thickness of the plastic shell and also recessed rings for the "soft" rings on top and bottom. In the end the thickness available inside on all the surface is below 6mm. My SMD plastic holders for CR2032 are 5mm, with 0.6mm for a thin PCB that doesn't leave much for the solder at the bottom of the board, they have to be centered inside the ring of the bottom plate to fit. It will need some drilling in the bottom plate to allow some air flow. But it's looking good, better than the black one and a bit cheaper so it's probably worth a bit of optimization
For powerbanks I have tried a few also, but as they are made for 18650 they are quite bulky. The cheap one as on your second link (and the one with square section too) have a good finish, I thought about using them as door/window sensors but the big "Power" text engraving and the holes for USB put me off
I'm thinking about using an aluminium xiaomi powerbank enclosure to use as a slick gateway though, with PA/LNA NRF24 and antenna outside.
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Found a few more things. If something a tad bigger than the OP's puck were needed, then there's this at almost the same price:
http://www.ebay.com/itm/Q8-QI-Wireless-Charging-Pad-2-USB-Port-Splitter-HUB-Charger-Pad-For-Phone-F5/301913729117?_trksid=p2047675.c100623.m-1&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D39345%26meid%3Decb1959e8f164eb5ad0a17aeaa297f59%26pid%3D100623%26rk%3D3%26rkt%3D6%26sd%3D252485416371Also, as far as solar cells go, I agree that some of them can be ugly looking. Not all of them though. Here's a couple that seem like they wouldn't look too bad, but for most things solar the prices are much higher than for a non-solar version (as you'd expect);
http://www.ebay.com/itm/12000mAh-Portable-Waterproof-Solar-Charger-Dual-USB-External-Battery-Power-Bank-/112160398867?var=&hash=item1a1d47de13
mSNAshLEYCjRnRKBS7jvE7Ahttp://www.ebay.com/itm/272407702880?var=571371942032
I like the look of the last one better, but of course it costs more than the other solar cell charger, so that's the trade-off.
From what I've read, most of these portable solar chargers would take a very long time to convert enough solar into enough stored energy to charge a phone, and so people end up mostly charging them from a usb charger, defeating the main purpose purpose of it. However, for powering a wireless sensor node, I suspect they capture enough solar from ambient light that they could be retrofitted for that purpose., at least for nodes that can sleep and don't always need to be running.
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Ah yes the "Q8" square charger looks great, I'm waiting for my new credit card to arrive to be able to order one
It's a bit bigger but it looks slick and it would allow to combine a few sensors inside. It could also contain a charging circuit and lipo to have rechargeable sensor.For the others, well I believe I would get high WRF (with R like rejection) instead of WAF
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@Nca78
I'm not really offended by the QB logo, but I'm guessing you would prefer one without the QB logo:or
Mainly because of the lengthy shipping delay, I think I'll get one of each and then decide which I prefer. Things don't always look the same on a website as they do in real life.
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Looking at the containers in our pantry here, I notice a lot of them have lids that, though they lack "bottoms", in many respects look a lot like the generic "puck" shape of the OP. For something that sits on a table top, you'd never know it doesn't have a bottom. These would be entirely free, because as my family here uses up a container, we invariably just throw it out.
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@Nca78 said:
I just today received an all white version of this (purchased it from ebay), but I wouldn't recommend it (well, at least not this color). The case itself is all white, which is what I wanted, but the silicon ring embedded in it is more of a cream color, and so it ruins the look by making it look old and/or dirty. It doesn't look like the photo on the web page. Also, as perhaps the OP pointed out, there are no vent holes, though they could be drilled.
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Here's another one, but this one I like. For a sense of scale, I photographed it with my large TH sensor sitting on top:
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You're receiving thing pretty quickly (as you received the PCB in less than 2 weeks, too), you're lucky !
I have no problem with the white ring on mine, it's not the same color than the plastic but it's not looking bad to me. Maybe different model, maybe a question of taste
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@Nca78
What do you think of the black one above? Thumbs up or thumbs down? I was surprised at the way it photographed. On the sides it's actually the same glossy black color as it is on top, but its so glossy that when I photographed it (with a flash) you're actually seeing a reflection of the white tabletop that it's sitting on. Similarly, you can also see a reflection of the white antenna on the glossy black portion on the top (though not in the matted black top area).The things I received yesterday were shipped domestically. It still takes a long time to get things if they're shipped from China.
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@NeverDie I don't know, do you have any "commercial" image of this box ? Crude flash light from one direction only never does justice to object (or people :))
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In the spirit of KISS, I think in most instances the following might work well for me:
My smallest wireless node can fit inside the case along with 2x AAA batteries positioned to produce 3V, and the case already has an exposed switch to turn it on/off. Total case size is relatively small, around: 6.2 x 4.8 x 1.5cm / 2.4" x 1.9" x 0.6"(LWH)
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I'll definitely order this and the AA version too, to check.
In the worse case it can be used for hidden node. It should fit a dedicated PCB even with pro mini as long as the radio is SMD to be flat enough.
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Newbie here.
I have used battery casing for sensebender & DC DC step up converter (2.5v to 5v).
Have to do a bit of filing & swapping of battery contacts and drill hole for sensebender.
Attach photos.
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Yup, your photo captures the notion of what I'm planning to do:
My original inspiration for it came from this:
http://johan.kanflo.com/the-aaduino/
which I might have done, except that I prefer the RFM69HW, which I don't think would fit in just one battery slot very easily.
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@NeverDie
Here I just received the black "pucK' sensor case that was shown in the OP. Pretty fast considering it was free delivery using China Post. So far I like it the best because it has the air vents already a part of it.
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That's why I selected it, best suited for temp sensor.
Just received the first version of the PCB but it will need some improvements.
But looks like it will work, not too bad for my first PCB ever
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I really like the pcb´s you are using @NeverDie, is it possible to buy them anywhere?
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@Cliff-Karlsson said:
I really like the pcb´s you are using @NeverDie, is it possible to buy them anywhere?
I'm just doing this for fun. If you want to buy something pre-made, I'd suggest buying a Moteino.
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@NeverDie
Ok, but is the PCB availible at OSHpark or is the files availble for sharing?
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Are you sure there's space for the coincell holder? The case is pretty thin. I ordered some tabbed coincells, but am still waiting for them to arrive.
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@Cliff-Karlsson
Maybe later. I'm still improving the design.
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@Nca78 said:
That's why I selected it, best suited for temp sensor.
Just received the first version of the PCB but it will need some improvements.
But looks like it will work, not too bad for my first PCB everHere's a newer evolution of my small TH node that includes a co-planar antenna. So, no long monopole antenna sticking out of the case.
I haven't attached the TH sensor yet because I've run out of them, but I'm pretty sure it will fit.
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@nca78
What's the best way to remove the cover on this thing? Do I just go for it with a pry tool, or is there a special trick to it?I'm hopeful it will fit a CR2477 tabbed battery, but it would likely be a very close fit if it does. In case it doesn't, have you come across any options that are a bit thicker?
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@NeverDie said:
One possible concern with this particular example is that it has a metal band around it. That's not so ideal for an RF node, but it may not matter, as I tested the PCB node (just by itself, without the solar puck) within a closed refrigerator and still got adequate signal from it.
I tried running one of my nodes inside the solar puck that has the metal band (above). It's maybe a few dB worse, but the link budget is large enough that it just doesn't really matter. So, I think it remains a viable option as an enclosure for thicker nodes that don't easily fit inside the OP's thinner recharger puck.
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@NeverDie said:
@nca78
What's the best way to remove the cover on this thing? Do I just go for it with a pry tool, or is there a special trick to it?I'm hopeful it will fit a CR2477 tabbed battery, but it would likely be a very close fit if it does. In case it doesn't, have you come across any options that are a bit thicker?
Sorry no magic solution to open
For the cell it should fit a 2477 but you need a thin PCB + thin holder.
Box is 10.6mm high minus 1.2mm thickness for the cover and 0.8mm PCB it leaves you with 8.6mm. 2477 is 7.7mm so you have 1mm left, not much but I think just enough if you use basic holder that's just made of a folded metal sheet.
But for such a basic sensor you would not need such a huge cell, CR2032 should last a very long time already, and 2450 could match your need of extra long lifetime and at the same time easily fit in the box. If your sketch is programmed correctly by the time a 2450 is dead the sensor will probably have become completely off because of aging
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I received the Q8 wireless charging pad (above):
http://www.ebay.com/itm/Q8-QI-Wireless-Charging-Pad-2-USB-Port-Splitter-HUB-Charger-Pad-For-Phone-F5/301913729117?_trksid=p2047675.c100623.m-1&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D39345%26meid%3Decb1959e8f164eb5ad0a17aeaa297f59%26pid%3D100623%26rk%3D3%26rkt%3D6%26sd%3D252485416371However, it is even thinner than the OP's vented puck, and it's about double the square inches of foot print. So I don't see any real advantage to them.
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For a thicker case, Amazon Dot looks like it might be very nice:
A bit pricey though!
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@NeverDie said:
I received the Q8 wireless charging pad (above):
http://www.ebay.com/itm/Q8-QI-Wireless-Charging-Pad-2-USB-Port-Splitter-HUB-Charger-Pad-For-Phone-F5/301913729117?_trksid=p2047675.c100623.m-1&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D39345%26meid%3Decb1959e8f164eb5ad0a17aeaa297f59%26pid%3D100623%26rk%3D3%26rkt%3D6%26sd%3D252485416371However, it is even thinner than the OP's vented puck, and it's about double the square inches of foot print. So I don't see any real advantage to them.
I have ordered one also (In fact two as aliexpress payment messed up and asked me to process payment again, but few days after I realized the "failed" payment was in fact processed and sellers were sending everything twice...).
I'm planning to use one as gateway box with wemos d1 mini and smd pa/lna NRF24 side by side. Any chance it will fit this type of ESP board inside or it's too thin and I should go for ESP12 module instead ?
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@Nca78 said:
@NeverDie said:
I received the Q8 wireless charging pad (above):
http://www.ebay.com/itm/Q8-QI-Wireless-Charging-Pad-2-USB-Port-Splitter-HUB-Charger-Pad-For-Phone-F5/301913729117?_trksid=p2047675.c100623.m-1&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D39345%26meid%3Decb1959e8f164eb5ad0a17aeaa297f59%26pid%3D100623%26rk%3D3%26rkt%3D6%26sd%3D252485416371However, it is even thinner than the OP's vented puck, and it's about double the square inches of foot print. So I don't see any real advantage to them.
I have ordered one also (In fact two as aliexpress payment messed up and asked me to process payment again, but few days after I realized the "failed" payment was in fact processed and sellers were sending everything twice...).
I'm planning to use one as gateway box with wemos d1 mini and smd pa/lna NRF24 side by side. Any chance it will fit this type of ESP board inside or it's too thin and I should go for ESP12 module instead ?I just now measured the D1Mini, and it's about 6.7mm thick. If you removed the USB connector, it would be thinner.
I haven't opened the QB wireless pad, so I don't know how much depth is available. However, the case itself is 8.5mm thick. In comparison, I measure the case thickness of your OP puck as 11.7mm.
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@NeverDie said:
I haven't opened the QB wireless pad, so I don't know how much depth is available. However, the case itself is 8.5mm thick. In comparison, I measure the case thickness of your OP puck as 11.7mm.
Thank you. Sounds like it won't fit
For Amazon Dot yes it looks great, but 50$ is a bit too expensive for a case
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I notice that Kalia made his own uniquely shaped enclosure that he 3D printed himself:
(for more detail see his posts under: https://forum.mysensors.org/topic/1566/mysensors-sensebender-micro-3dp-case/18)I'm not yet savvy about 3D printers, but from what I've been reading lately the line artifacts in the plastic may vary in how prominent they are depending on the quality of the software slicer that's used to produce the g-code that's sent to the 3D printer. Still, I'm not sure to what extent it's avoidable or just a reality of 3D prints. Would such line artifacts always be visible, regardless of which printer or software produced it?
In any event, I like the way Kali molded the battery holder into the case itself. Very clever!
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@NeverDie the lines will be more or less visible depending on layer height (which varies by 3d printer model) but can easily be made totally smooth. See this video
Cold Acetone Vapor Finishing for 3D Printing – 03:02
— doodaddoes
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@mfalkvidd said:
@NeverDie the lines will be more or less visible depending on layer height (which varies by 3d printer model) but can easily be made totally smooth. See this video
Cold Acetone Vapor Finishing for 3D Printing – 03:02
— doodaddoesFunny that in the video the demonstrator uses a polypropylene chamber, as I'm pretty sure acetone will strongly react with it. Aside from that, though, it was a good video. Thanks for posting it!
He seems to imply this acetone vapor chamber approach only works on ABS printed models. Is that correct?
Also, what must the 3D printer's layer height be for the lines to no longer be visible (without resorting to acetone vapors)?
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Looks as though my small TH mote will have no problem fitting inside the OP's enclosure:
I can also configure my medium TH mote to also fit. The enclosure is too thin to accomodate AAA batteries, but I should be receiving the button cell batteries from China very soon.
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@NeverDie said:
Looks as though my small TH mote will have no problem fitting inside the OP's enclosure:
I can also configure my medium TH mote to also fit. The enclosure is too thin to accomodate AAA batteries, but I should be receiving the button cell batteries from China very soon.
Don't forget a capacitor parrallel to the button cell battery if you want it to last more than a few days
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@Nca78 said:
Don't forget a capacitor parrallel to the button cell battery if you want it to last more than a few days
That's good input, as I haven't yet tried running it on a button cell. Is a button cell alone just not able to keep up with the Tx load? I had wanted to avoid button cells altogether, but even an AAA battery has too wide a diameter to fit in this enclosure.
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It might be worthwhile to make a board specifically for this enclosure. It would necessarily have to have a somewhat similar size as the board that was in it, so that it could mount an LED near the LED window, and a micro USB at the USB window, all while fitting the groves of the enclosure.
BTW, how did you get that sticky black foam tape out of it? I tried scrapping it off, but I didn't manage to remove all of it.
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@NeverDie said:
That's good input, as I haven't yet tried running it on a button cell. Is a button cell alone just not able to keep up with the Tx load? I had wanted to avoid button cells altogether, but even an AAA battery has too wide a diameter to fit in this enclosure.
No it can't keep up with it without a serious voltage drop, especially at startup and with RFM radio. A 100µF ceramic capacitor (and sleep between successive tx in your code) should be enough from what I read from scalz who made a few boards with button cell + RFM.
I just uploaded version 0.2 of my dedicated board to Seeed, it should be just the right size this time
Led is in front of the led window but on USB side I don't have anything, it's just a vent.
For the black tape I don't remember having so much pain to remove it, maybe it's different between enclosures, I will tell you when I receive the next one.
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It would be nice to keep the usb port as an aid in reprogramming it, so that the case doesn't have to be opened or without having to do wireless OTA programming of it. Alas, it's probably feature creep.
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On my medium node, I found that if I used right-angle FTDI header pins and if I splayed the antenna and the Temp-humidity-pressure sensor out horizontally, then the overall thickness was low enough that I could fit it inside the OP's enclosure.
Also, I think that if, rather than clipping the LED's legs after soldering it close to the board, I instead left the LED legs long, then I could bend it over and have it pointed at the LED window on the OP's enclosure, to maximize its visibility outside the closed enclosure. So, on a future version, I'll try that.
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After a long-wait, I received my so called "tabbed" CR2477 batteries today from China via AliExpress. According to the seller, they would look like this:
and so that is what I was expecting. Instead, what the seller sent me was:
which obviously has no tabs.
Anyhow, the second photo shows the depth of the battery in relation to the OP's case. It looks to me as though with tabs it likely would have been too thick for the cover to snap back on the OP case.
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@NeverDie
not cool
I hope your 2477 will work well
my little xp about coincells showed me that i can't trust ali coincells.. well i tried only few orders, but those wasted my time searching for bugs whereas batt were discharged and didn't check this in first place as i was using fresh ali coincells. I was thinking it couldn't be that! Then i checked their voltage in case...and was surprised!
Changing for good and strong coincell was day&night.if it can help you to not run in dumb issue, for future
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@scalz said:
@NeverDie
not cool
I hope your 2477 will work well
my little xp about coincells showed me that i can't trust ali coincells.. well i tried only few orders, but those wasted my time searching for bugs whereas batt were discharged and didn't check this in first place as i was using fresh ali coincells. I was thinking it couldn't be that! Then i checked their voltage in case...and was surprised!
Changing for good and strong coincell was day&night.if it can help you to not run in dumb issue, for future
Urban Dictionary: "get shanghaied"
www.urbandictionary.com/define.php?term=get shanghaied
Top Definition. get shanghaied. verb, ditransitive, passive (with to Be or to Get). to be swindled, cheated, lied to, robbed, stolen from, duped, conned, deceived.Not sure what I'll do with the "non-tabbed" batteries. Shipping costs between the US and China are asymmetric, and it would probably cost me more in time and money to ship them back with tracking to the seller than I would get in a refund. Oh well, I guess I'll be buying batteries from Digikey in the future. It will cost twice as much, but at least I'll get the real thing.
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@NeverDie
ahah, this one is funny
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I just now ordered this CR2460 battery from Digikey: http://www.digikey.com/scripts/DkSearch/dksus.dll?Detail&itemSeq=212190252&uq=636150784616350020
It's a bit thinner and should have a better chance of fitting inside the OP case.
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Epilogue: I get a call from Digikey to tell me that they can't ship the button cells by first class mail because they contain lithium. Mind you, I only ordered 3 of them. Instead, they can only be shipped by either UPS ground or FedEx ground, both of which will cost me about $10 for the shipping alone.
Yet, USPS apparently had no trouble delivering the CR2477 button cells from China using ePacket delivery. Argh, it's all just ridiculous!
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@NeverDie no, USPS are not ok with that. http://pe.usps.gov/text/pub52/pub52c6_004.htm#ep270347
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@mfalkvidd said:
@NeverDie no, USPS are not ok with that. http://pe.usps.gov/text/pub52/pub52c6_004.htm#ep270347
Not that it matters, but I wonder why is it acceptable for lithium batteries to be shipped installed in equipment, but unacceptable if not installed?
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@NeverDie my guess is that the rulemakers took a pragmatic approach. Banning batteries in equipment might have been too hard, which could have brought down the entire proposition. So they opted for rules that are less safe than total ban, but more safe than no rules at all.
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My two cents
Batteries inside equipments are protected from shock by said equipment, shocks/bending beeing one of the main reasons for battery fires.
It could also be related to the "density" of batteries. Having one battery burning inside an equipment will slow down the propagation of the fire and is relatively easy to deal with a fire estinguisher.
Having a fire in one battery that will propagate to other batteries shipped together is a nightmare.But I'm surprised they apply this rule (that I thought were made to deal big rechargeable batteries) to a bunch of button cells
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LOL. This is the ultimate catch-22: I can't mail the falsely advertised batteries back to China, even if I wanted to! The only way to do it would be to first install them in some equipment and then ship the equipment, but then they would be used batteries and no longer new, so the seller could refuse a refund on those grounds. Since returning them is impossible, maybe I can appeal to Ali Express for a refund without returning them. This is becoming entertaining.... A refund from Ali Express would almost cover the cost of shipping from Digikey.
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They sent the wrong stuff. Opening a "case" will most probably get your money back.
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I just received the white version and it's gorgeous ! Ordering bunch now to put everywhere in the house
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@Nca78
Would you please post a link for the white ones? All I recall ever finding were the black ones.
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Link is here but unfortunately it says "no more available"
Found some here at 3€ :
https://www.aliexpress.com/item/Qi-Wireless-Newest-Charger-for-iPhone-Samsung-Galaxy-S3-S4-Note2-Nexus-All-free-shipping/32735986077.htmland here 3€38
https://www.aliexpress.com/item/2016-New-Fast-Charge-Qi-Wireless-Newest-Charger-for-Samsung-S4-S5-Note3-Cell-Phone-Accessories/32669922722.html
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And same seller has one it seems, at 2€78, but only interesting if you buy 1 item to get free shipping, else the one at 3€ is cheaper as there's no limit in item count for free shipping option
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@NeverDie I found a good way to open them without any damages.
I have that cheap DIP chip extractor that's very bad at doing it's job, but it happens that it's the perfect size to fit in the vents at the bottom, if you put it inward and pull you can pop up the bottom cover easily.I bought 10 white chargers from the "woweinew" shop for 30$ with China Post Registered Air Mail included after a few seconds of negociations.
I also found some SMD 7021 breakouts with only minimum components onboard, they are a bit more expensive but save some space in PCB surface and thickness. And no need to waste time removing and shorting the voltage regulator.
https://www.aliexpress.com/item/Industrial-High-Precision-Si7021-Humidity-Sensor-with-I2C-Interface-for-Arduino/32524005324.html
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Just FYI: it turns out you have to avoid exposing the si7021 sensor to high humidity (>80%) unless you turn its buiilt-in heater on--which, unfortunately, will drain a battery rather quickly. It's in the datasheet, but not as prominently as it should be. Therefore, going forward, I'm switching to the BME280, which costs more but appears not to have this issue. I do have some si7021's, but I think I'll probably only trust the temperature reading and consider the humidity reading as a rough gauge only.
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@Nca78 said:
Link is here but unfortunately it says "no more available"
Found some here at 3€ :
https://www.aliexpress.com/item/Qi-Wireless-Newest-Charger-for-iPhone-Samsung-Galaxy-S3-S4-Note2-Nexus-All-free-shipping/32735986077.htmland here 3€38
https://www.aliexpress.com/item/2016-New-Fast-Charge-Qi-Wireless-Newest-Charger-for-Samsung-S4-S5-Note3-Cell-Phone-Accessories/32669922722.htmlThe first link has them back in stock. I just now ordered one from them.
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@NeverDie said:
Just FYI: it turns out you have to avoid exposing the si7021 sensor to high humidity (>80%) unless you turn its buiilt-in heater on--which, unfortunately, will drain a battery rather quickly. It's in the datasheet, but not as prominently as it should be. Therefore, going forward, I'm switching to the BME280, which costs more but appears not to have this issue. I do have some si7021's, but I think I'll probably only trust the temperature reading and consider the humidity reading as a rough gauge only.
Yes I have seen that but I wonder how much the "drift" really is. As long as the temperature is still precise (and it is from my observations) a drift in humidity measurement is acceptable, as long as it can still reflect changes. I've also ordered BME280 (6 pins version with no voltage regulator) from 2 different suppliers anyway, so I will be able to compare sensors side by side with every other part coming from the same batches.
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Great. I'd be interested to hear of any conclusions you might reach from whatever comparisons you're able to perform.
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At the moment I have still not received my BME280 sensors so I'm testing with the si7021 only.
For the first step I have put 3 of them on top on each others and checked their reported values over nearly one week.
I must say I'm very impressed by what I have seen at the moment, the maximum temperature span I have seen was 0.3°, and 3% for humidity.
Now I can confirm the sensors report the same values, I'll move one of them in the children's bathroom where it's supposed to have the maximum humidity exposure. If reported humidity is high enough (>90%) I'll leave it there for 2 weeks then move it back together with other sensors and see if it got a shift in humidity measurement.
Typical display in Domoticz: very reproductible values between the 3 sensors.
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Sounds like a good experiment.
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So unfortunately when I started this test it was "dry" season so even in batchroom it didn't prove very conclusive.
Had problem with battery life also due to bad settings + power cuts. Limitless reconnection time before going to sleep was fatal with 4h+ power cutsJust reprogrammed them today and put them back in place, 2 @1MHz with CR2016 and 1 @8MHz with CR2025.
Rainy season is back and I have high humidity values on the 3 of them, 91% in bathroom right now so I should be able to run the test.
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These chargers are looking really good... Great job on this!
Has anyone used these garden lights? They look like they'd be ready to go as a PIR/multi-sensor considering there's already a AA holder and plenty of room under the lens. Maybe they could be tucked up by the ceiling. It wouldn't quite be flush because of the sloping top, but it may not be bad.
Searching around I see at least two different variations--one has a smoother, cleaner look to the lens and the other looks more "knobby." Some come with a battery and some do not.
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@hautomate well it doesn't look so great imho.
There's no space for PIR lens so you have to make one yourself, it looks like hard plastic and it won't be easy to drill without generating any cracks.
No holes to put other types of sensors like temperature/humidity/... so same problem. In addition if you put it under the sun to charge, the temperature inside will not allow any measurement of this type.
Charging circuit is primitive, it's probably the same IC than in the 1$ garden lights and it just puts voltage to the battery +/- without any control of voltage: not a good way to maintain a good health for the battery.So in the end you have a box that you need to modify to make it a sensor (except maybe a light sensor), you have a solar panel that provides a too low voltage so you need a step up converter, you have a charging circuit that's too bad to use and that in the end won't make the rechargeable battery last longer than 2 AA... Rather expensive for a plastic box
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Also, at least based on my experience with cheap Chinese solar garden lights, the battery connections (and probably a lot of other parts too) will rapidly corrode/rust and fail soon after. Sorry if that sounds negative, but I see nothing to suggest otherwise in this instance. So, if you do decide to try it anyway, I suggest you try just one and see how it handles your weather first.
That said, my wife bought some solar garden lights at Costco earlier in the year, at about $8 each, and so far they're holding up and are working very well.
However, in that case, you've got an institutional buyer (Costco) with an interest in quality handling the due diligence on build quality and with a very generous and easy return policy. On Aliexpress, that just doesn't exist.
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Yeah, I hear ya...
I'm thinking indoor use here and not using the solar panel or circuitry for anything--just use the plastic and lens and pack it with PIR and temp/humidity. Mounted up high on a wall, any holes could be drilled on the top as that side wouldn't be seen.
I'm going to try one out...
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Finding things to make into cases is fun. Here is my raspberry pi.
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This post is deleted!
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@nca78 said in Clean looking sensor node:
Typical display in Domoticz: very reproductible values between the 3 sensors.
So some follow up on the sensors comparison. I'm still using the same sensors, unfortunately my son threw his behind (I think) his wardrobe so I cannot access it. But I put the 2 others side by side in the fridge, waited 20 minutes after closing the door and after 3 years of use they are still impressively consistent !
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And after getting out of the fridge, side by side, only a reasonable difference in humidity level. ( and yes, the weather is unconfortable today
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