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Open Source Outdoor Air Quality Monitor

airgradient.com

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Re: Open Source Outdoor Air Quality Monitor

#81

Post by ahaucnx »

hlandau wrote: post #78

I always get surprised by how many sensor products offer temperature and humidity but not pressure, considering that combined MEMS temperature/humidity/pressure chips are available. Having a sensor which can do temperature/humidity/pressure as well as air quality/CO2 would definitely be of interest to me.

When we started with the monitor development we looked at several temp/humidity sensors and some had pressure included. However after testing several of them we found out that the SHT series from Sensirion offers the best accuracy/calibration out of the factory. So we used them and I think they are also used in many other monitors.

Re: Open Source Outdoor Air Quality Monitor

#83

Post by cyberax »

jeffnappi wrote: post #51
cyberax wrote: post #37

Earlier quoted context omitted.

Just a note: can you stagger the sensor time a bit unevenly? Instead of 50%/50% time split, can you do something like 40%/60%? This reduces the risk of both sensors failing at once because they have approximately the same duty time.

Considering it is open source, you could do this :)

I've just ordered a device, we'll see.

Re: Open Source Outdoor Air Quality Monitor

#84

Post by petemir »

yosito wrote: post #82

I'm trying to order one of these for my home in Thailand in an area with poor air quality monitoring. On the website it looks like you ship to Thailand for just $20. Is that really the case?

And what about customs fees? I’m also interested buying from Europe/Switzerland.

Re: Open Source Outdoor Air Quality Monitor

#85

Post by mplewis »

ahaucnx wrote: post #2

I'm the founder of AirGradient and last year we have decided to focus our company on open hardware air quality monitors that we produce professionally. Our outdoor monitor Open Air has been designed from the start as an open hardware project with a beautiful plastic injected enclosure to demonstrate that open source hardware can look and perform on the same level like traditional products. We do also work intensively…

Will it be possible to get a DIY kit for the outdoor monitor? I would be interested in 3D printing my own case at home.

Re: Open Source Outdoor Air Quality Monitor

#86

Post by Havoc »

ahaucnx wrote: post #41
cyberax wrote: post #36

Earlier quoted context omitted.

How good is the calibration for your temperature and humidity sensors? I'm absolutely miffed by the poor-quality sensors that are off by 10% humidity and 2-3C of temperature. I bought several sensors to try and find the best ones, and now like a man with two watches I'm never sure what the actual time is.

Most of the times the sensor modules are actually pretty accurate but the heating up of the enclosure e.g. from heat radiated by the MCU creates the issues. In our indoor monitor it took us several months to get the airflow through the enclosure right so that the temperature and humidity sensors are very close to ambient.

Yep. Recently superglued a temp ensor straight onto the back of an ESP32. Seemed like it would be ok given two pcbs with low thermal conductivity in between.

...5 degrees diff. Damnit.

Re: Open Source Outdoor Air Quality Monitor

#87

Post by ahaucnx »

mplewis wrote: post #85
ahaucnx wrote: post #2

I'm the founder of AirGradient and last year we have decided to focus our company on open hardware air quality monitors that we produce professionally. Our outdoor monitor Open Air has been designed from the start as an open hardware project with a beautiful plastic injected enclosure to demonstrate that open source hardware can look and perform on the same level like traditional products. We do also work intensively…

Will it be possible to get a DIY kit for the outdoor monitor? I would be interested in 3D printing my own case at home.

Yes should be possible. Please contact us via our contact form on the website.

Re: Open Source Outdoor Air Quality Monitor

#88

Post by ahaucnx »

yosito wrote: post #82

I'm trying to order one of these for my home in Thailand in an area with poor air quality monitoring. On the website it looks like you ship to Thailand for just $20. Is that really the case?

We are based in Thailand :) and yes we try to keep international shipping costs low.

Re: Open Source Outdoor Air Quality Monitor

#89

Post by ahaucnx »

petemir wrote: post #84
yosito wrote: post #82

I'm trying to order one of these for my home in Thailand in an area with poor air quality monitoring. On the website it looks like you ship to Thailand for just $20. Is that really the case?

And what about customs fees? I’m also interested buying from Europe/Switzerland.

Most of the time people get not charged customs but I think Switzerland is one of the few countries that are relatively strict.
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