ahaucnx

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391.
by ahaucnx 4y ago
The sensor modules are often not the problem. It is the heat radiation from other components in the enclosure that influence the temperature.
392.
by ahaucnx 4y ago
Since the 1960s we have "Stiftung Warentest" in Germany which does unbiased indepth product reviews and is a very popular magazine. They review more than 200 products every year and the tests are carried out by independent externa
393.
by ahaucnx 4y ago
Yes I agree. Much easier. That was basically our version 0 ;)
394.
by ahaucnx 4y ago
An interesting story: In our journey to get the temperature right, we made extensive use of thermal imaging and compared our prototypes with competitors. The images showed that one of these sensors got extremely hot during operation but the
395.
by ahaucnx 4y ago
Great article and I mostly agree. We launched our indoor air quality monitor AirGradient ONE at the beginning of this year. We measure PM, CO2, TVOCs, temperature and humidity. When we started the development we would have never thought t
396.
by ahaucnx 4y ago
Thank you for mentioning us. Since a few months we have an improved AirGradient PRO kit [1] that has a much better design, temperature accuracy and enclosure. It is fully open-source, open-hardware including 3D enclosure files. [1] https:
397.
by ahaucnx 4y ago
One solution could be to make the building code much stricter and only allow to build houses that are build with materials that could survive a wild fire much better [1]. These houses would most likely be a lot more expensive to build but c
398.
by ahaucnx 4y ago
I like the idea but I am not sure if a discord server / whatsapp will get indexed by Google? If not you might loose out on getting free traffic. You might just consider a good old forum, e.g. discourse [1] which is pretty easy to imple
399.
by ahaucnx 4y ago
That is a good point. I believe you are having our DIY air quality kits that are as you describe very simple. Our commercial product AirGradient ONE has a much more complex PCB with tons of additional components e.g. DC DC converter to run
400.
by ahaucnx 4y ago
That's a good point we were not aware. We will rewrite that page and make it more authentic.
401.
by ahaucnx 4y ago
See my comment above about pricing. We also have pre-soldered open source kits available that are "hacker friendly". More information on this page: https://www.airgradient.com/open-airgradient/kits/
402.
by ahaucnx 4y ago
Yes it's probably easier to design but there are no reasons why a phone needs so many glued parts inside and the latest iPhone demonstrates that there are ways to design for maintainability.
403.
by ahaucnx 4y ago
We focus on b2b and prices start at USD200. We also have an open source kit with very similar sensors starting at around USD70. More information here: https://www.airgradient.com/open-airgradient/kits/
404.
by ahaucnx 4y ago
On our product (air quality monitor[1]) we made the concious decision to design it for long life and repairability by e.g.: - using no glue or snaps - all components on one PCB, no thin cables that can break - standard philips/torx scr
405.
by ahaucnx 4y ago
With the DHT series of sensors supported in this firmware we made pretty bad experiences in regards to accuracy and lifetime. It also uses a non standard protocol and not eg i2c. I think one of the best sensors for temperature and humidity
406.
Living in an Area with High Air Pollution? Consider Positive Pressure Systems(airgradient.com)
2 points by ahaucnx 4y ago|0 comments
407.
by ahaucnx 4y ago
Air pollution causes not only cancer but a variety of health issues including things like asthma or even behavioral impacts. Small particulate matter can get into the blood circulation and then stay in your body with all kinds of long term
408.
by ahaucnx 4y ago
It would be interesting to know if the probability of developing cancer has a linear relationship with the amount of air pollution. For example would double the amount of PM2.5 pollution double the cancer risk?
409.
by ahaucnx 4y ago
If you are looking to build an open-source / open-hardware air quality monitor that uses the same sensor modules like commercial monoitors check out the AirGradient DIY monitor project that we maintain. [1] [1] https://www.a
410.
by ahaucnx 4y ago
Many residential houses, especially in Europe do not have HVACs systems installed and rely on opening windows to get fresh air into the house. As the article mentions this poses risks of getting outdoor pollutants into the homes, especially
411.
by ahaucnx 4y ago
If you run an open source hardware project like we do with our DIY air quality monitors [1] you can also monetize it via selling hardware kits or work with affiliate links to e.g. Amazon or AliExpress. However selling hardware has some addi
412.
by ahaucnx 4y ago
All modules we use in our DIY kits [1] are factory calibrated and we use the same sensor modules in our commercial sensor that went through the RESET Air certification. So these sensors are very good. We compare them side by side and see no
413.
by ahaucnx 4y ago
Some low cost sensors are offering data channels down to 0.3 microns like the Sensirion SPS30 but in my opinion most of them are tuned towards delivering the highest accuray at around 2.5PM because many standards (e.g. WHO) are based on PM2
414.
by ahaucnx 4y ago
This article is from 2012. The Dylos was one of the first relativelely affordable PM2.5 monitors. Now we have a much higher range of pretty accurate fine dust sensors using the laser scattering method. We work a lot with the Plantower PMS50
415.
AirGradient Open Source Air Quality Monitor Built Instructions and Kit(airgradient.com)
1 points by ahaucnx 4y ago|0 comments
416.
by ahaucnx 4y ago
Yes, it was actually 0.5mm off and very visible.
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by ahaucnx 4y ago
Author here. Happy to answer any questions.
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Hardware Is Hard – The Journey of the AirGradient DIY Kit Production(airgradient.com)
3 points by ahaucnx 4y ago|3 comments
419.
by ahaucnx 4y ago
Shameless plug. We are maintaining an open source / open hardware indoor air quality project that measures CO2, PM2.5, temperature and humidity [1]. We use the same CO2 Sensor (Senseair S8) as the device in the article and I can confir
420.
by ahaucnx 5y ago
I think 65k ppm is outside the measurement range of the S8. It might be a communication or code issue that causes this and not from actual measurements.

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