Earlier quoted context omitted.
They will be!
I just put one on order :)! Any idea when the PM sensors will be back in stock? I was thinking about grabbing one from elsewhere, but I imagine I need a cable pinout :)
Hopefully about a week!
Show HN: Enviro+ for Raspberry Pi – Environmental sensors
51–60 of 83 posts
Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors
#52Earlier quoted context omitted.
The most likely candidate is the TelAire T6613 [1]. Like most sensors in this price range, it reports data on I2C. [1] https://www.co2meter.com/collections/0-1-co2/products/t6613-...
Have you considered the much cheaper MH-Z19 or even the CCS811? Doubt they're as capable or accurate but I'd be interested in hearing the reasons behind going with the pricier sensor if you've got time to share.
Good question. My casual research into CO2 sensors is that they are generally made for indoor air quality rather than outside atmospheric concentration. Indoor CO2 concentration can soar as high as 1000 ppm where outdoors hovers around the 400 ppm level, so it is important to get a sensor made for the lowest range. The T6613 is specified for operation at 400 ppm so that is a big driver for my decision.
The MH-Z19 has a model specified for 0 to 2000 ppm so it might work fine. I don't know about the CCS811, the data sheet says it measures "equivalent" CO2, which is not a direct measurement, but a quantity inferred after measuring other compounds.
In the long run, there are calibration problems, as the photodetector ages. The best sensors have two light sources and automatically compensate for this effect. Indeed the other candidate I am considering is the Telaire 6615 which has dual sensors. My plan is to use the one of the two Telaires, preferably the dual sensor version, and correct measurements for temperature, pressure, and humidity. Hopefully, it will be accurate for a long time without the need for calibration with a known gas.
FWIW, I am just an amateur and welcome informed opinions. Scientific instruments that measure accurately in the atmospheric range are too pricey for me. The scientific community is just now starting to evaluate low cost sensors like the ones mentioned here, see [1] for a summary of some recent evaluations.
[1] https://www.wmo.int/pages/prog/arep/gaw/documents/Draft_low_...
Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors
#53Is there a case option?
Making your own Stephenson Screen seems like one of the better uses of a 3D printer I've seen :)
https://www.thingiverse.com/thing:83969
Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors
#54This looks great. I've been waiting for a nice, hackable, cheap set of environmental sensors!
There's only one "improvement" I would like to see - an option to buy a cheaper version without a display attached. For my application I will not need any display, and it seems a shame to spend resources on one when it's only going to get destroyed by the elements :)
Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors
#55Anyone have experience making an enclosure for something like this to use outdoors? Thinking of like a Stephenson screen with a built in solar panel for powering the Pi + Hat.
Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors
#56Earlier quoted context omitted.
You can easily calibrate co2 , 02 and n2 sensors by going outside in a "wild/nature" place
Depends on the sensor, also full auto mode usually means (for example MH-Z19) that it recalibrates every X hours, which means you'd have to go to the woods fairly often ;)
can be disabled. But then I'd recalibrate them after a few months. (I do it after 6 months usually)
Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors
#57Any reason why the particulate matter sensor cannot be used indoors?
Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors
#58I love Pimoroni Modules, having used the MicroDot pHAT, Unicorn boards, Touch pHAT, (and several more). The only problem I have is that the libraries aren’t particularly well written. Of course they’re open source and I would like to improve them, but as far as I know there are no schematics available. Example being, the Touch pHAT (very good board btw) doesn’t use interrupts and library is sorta messy. I still use i…
We're working on opening up the schematics to our range, watch this space!
Thank you! That’s all I needed, and of course I’ll contribute back the changes I made to libraries (particularly the Microdot pHAT — which I love by the way — just that the changes are not pretty at the moment...).
Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors
#59Re: Show HN: Enviro+ for Raspberry Pi – Environmental sensors
#60I wonder how easy it would be to convert, or design something similar to the Enviro+ that is in a waterproof enclosure with battery. Could be useful for collecting data on some basic water quality(turbidity,conductivity,pH,temp) alongside water level.
We currently use In-situ Aqua Trolls[1] to gather these parameters, but a solution like this could almost be considered disposable; hand them out to people in remote areas and you could potentially realise data for rivers/creeks that rarely flow, and would otherwise go unmonitored due to the time and finial investment required.
Very interesting project, thanks for sharing!
[1]https://in-situ.com/products/water-level-monitoring/aqua-tro...