ahaucnx

13 ms·

121.
by ahaucnx 2y ago
Thanks for letting me know. It's fixed now.
122.
by ahaucnx 2y ago
The most important thing is that you use an NDIR CO2 sensor. The best are in my opinion from SenseAir (e.g. the S8 that we use in our monitors). Then you can also get them from Sensirion, Winsen or Cubic. I believe for normal operations the
123.
by ahaucnx 2y ago
I believe that the Sensirion SGP41 is the slightly better VOC sensor and it also gives an NOx signal that can be useful: "The testing results show that the SGP41 has a better response for 9/10 tested VOC solvents and can detect th
124.
by ahaucnx 2y ago
Yes and to be honest, most of the air quality monitors use very similar PM modules. So often there is not too much difference in the accuracy of the monitors. I wrote about this some time ago [1]. However when it comes to data ownership, AP
125.
by ahaucnx 2y ago
We plan to compare more monitors. This is the first of this kind of reviews so we want to first see how well it is accepted and then do more.
126.
Air Quality Monitors Compared: AirGradient vs. Purple Air(airgradient.com)
86 points by ahaucnx 2y ago|54 comments
127.
by ahaucnx 2y ago
In comparison to air pollution measurements of PM2.5, there are not many monitors out there that measure CO2. Last year we started experimenting with measuring CO2 outdoors with low cost sensors and saw promising results in the accuracy com
128.
by ahaucnx 2y ago
Last year I wrote a blog post [1] about different CO2 sensors and how they work. The best are NDIR (light) followed by photo acoustic sensors. Indoors they have very similar performance but outdoors, the NDIR (light) are much more accurate
129.
by ahaucnx 2y ago
First of all many thanks for helping to maintain such a great project! The feedback I have right now is that for the ESP32-C3 chip, provisioning over USB (Improv_serial) is not supported. So then the only option is to do provisioning over B
130.
by ahaucnx 2y ago
What I love most about ESPHome is the strong and engaged community. For our open-source hardware air quality monitors [1], a member of the community developed a sophisticated ESPHome integration [2]. His integration comes with all features
131.
by ahaucnx 3y ago
These are all excellent points that demonstrate the complexity of air quality measurement -especially for PM. We are planning many more articles like this one and hopefully step by step we can cover some of these aspects as well.
132.
by ahaucnx 3y ago
Yes that's a good point. We will look for more suitable photos to illustrate this better - ideally from the same city. We could probably use Chiang Mai, Thailand where our company of located and has wide annual swings of air quality.
133.
by ahaucnx 3y ago
Just to clarify. We label the banner BELOW the article with this disclaimer. The article itself is purely written from a science perspective and not at all an advertisement.
134.
by ahaucnx 3y ago
It really depenends on the PM sensors you use. For the Plantower 5003 we use in our monitors, you only hear a faint noise from the fan when you put it directly at your ear. However some other monitors need an extra fan in the enclosure and
135.
by ahaucnx 3y ago
I believe you talk about the section about normalized RMSE (nRMSE). The nRMSE on the right side is 6% and thus lower than the nRMSE on the left side with 66%. The lower the nRMSE the better. So I believe the article is correct. However it&#
136.
by ahaucnx 3y ago
This post is part of a series of posts. We already wrote a few posts about sensor calibrations, e.g. how to develop a correction algorithm for temperature [1] or how to use R for making a linear regression [2]. In one of the next topics we
137.
by ahaucnx 3y ago
Achim from AirGradient here. Thank you for your support. Very appreciated. We are currently working on bringing a lot more features into our open-source firmware [1], for example mDNS, local API etc. to make it even easier for non-cloud con
138.
How to Determine the Error of an Air Quality Sensor?(airgradient.com)
128 points by ahaucnx 3y ago|47 comments
139.
TVOCs – When it's useful and when it's useless(airgradient.com)
1 points by ahaucnx 3y ago|0 comments
140.
by ahaucnx 3y ago
Hardware and software is licensed under CC BY-SA 4.0 Attribution-ShareAlike 4.0 International. It's mentioned in our build instructions but we can probably make it more clear in the terms and conditions. So yes you can take our existin
141.
Open Source Hardware Is Not a New Concept(airgradient.com)
1 points by ahaucnx 3y ago|3 comments
142.
Why Do We Need So Much Tracking? We Don't(airgradient.com)
2 points by ahaucnx 3y ago|0 comments
143.
by ahaucnx 3y ago
I think what's often underestimated is actually the performance improvement you get from removing trackers. I did so 2 months ago for our landing page and it now loads 4 times faster [1]. Fun fact. All the tracking I removed I am not m
144.
by ahaucnx 3y ago
Author here. This issues really itches me and it would be great to hear opinions on this. Maybe I am too sensitive for these things? Please let me know your thoughts!
145.
We own all rights to all data collected via products purchased by you(airgradient.com)
4 points by ahaucnx 3y ago|2 comments
146.
by ahaucnx 3y ago
Even though this laptop seems to be a bit impractical and really made for very specific (hacker) use cases, it's great to see more open hardware options coming up. Hopefully MNT will use the same philosophy and design a more main stre
147.
Our Website Loads 2-4 Times Faster After Removal of (Unneeded) Tracking Scripts(airgradient.com)
4 points by ahaucnx 3y ago|2 comments
148.
by ahaucnx 3y ago
One of our community members actually added Home Kit support. See: https://forum.airgradient.com/t/airgradient-integrations/703...
149.
by ahaucnx 3y ago
At the moment you need to flash ESPHome onto it (can be done easily via the browser) and then there is a well maintained ESPHome configuration script available. https://github.com/MallocArray/airgradient_esphome
150.
by ahaucnx 3y ago
This is definitely on our radar. At the moment we still have a lot of dynamics in the product, eg frequent firmware updates on the shipped units and this is why we currently prefer to ship directly. Once things are more settled down we will

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