joshefin

7 ms·

1.
by joshefin 7y ago
Senseair is a Swedish company and definitely not "cheap Chinese crap". Do you know about any research that confirms your statements about the accuracy? I believe that some of the more expensive sensors are more accurate, but this
2.
How to Measure CO2 with a Low-Cost Sensor and a Raspberry Pi(joshefin.xyz)
8 points by joshefin 7y ago|6 comments
3.
by joshefin 7y ago
Thanks for sharing. I wanted to get Winsen MH-Z19B, but Senseair S8 (residential) looks like a better, more reliable option, for a DIY project. One comparison: https://www.letscontrolit.com/forum/viewtopic.php?t=3736&a
4.
by joshefin 7y ago
Yes, Prism is great. Most of the blogs cramp the code in width, I let it spread it's wings full width.
5.
by joshefin 7y ago
The fan inside the PMS7003 sensor is very quiet.
6.
by joshefin 7y ago
Netatmo only measures CO2 and depending on your location it would be more useful to know about particulate matter in the air.
7.
by joshefin 7y ago
I have the same experience - Xiaomi makes good and cheap hardware, but the software and reliability are bad. And if you want to keep your data private, skip them.
8.
by joshefin 7y ago
I can just confirm what others are saying here - Java is great for the development of robust and reliable software. If you need even lower memory usage, you can compile the Java app with a GraalVM to a native image.
9.
by joshefin 7y ago
RuuviTag is a sensor capable of measuring the temperature, relative air humidity, and atmospheric pressure and sending the data over Bluetooth. I wrote about it in a linked article - https://joshefin.xyz/temperature-humidity
10.
by joshefin 7y ago
Sorry, I can't recommend any. If you just want to know if the air is polluted or not, and humidity does not go over 70%, any low-cost sensor would be good.
11.
by joshefin 7y ago
If your air purifier has a screen and shows the air quality, it's most probably using a PM sensor like the one I write about here. How accurate is PMS7003? If for example, you need to know the precise and exact concentration of particu
12.
by joshefin 7y ago
You can use the PM measurement that the sensor outputs to calculate the Air Quality Index (for Europe: http://airindex.eea.europa.eu/ ) and for example, make it send you a notification when the pollution level goes up, so yo
13.
by joshefin 7y ago
I used RuuviTags ( https://ruuvi.com/ ). They use a battery and send data over Bluetooth to your mobile phone.
14.
by joshefin 7y ago
Python is great for prototyping, but my grand plan with this project is to add more sensors, integrate with some "smart home" devices and create a web UI - and I'm more comfortable coding all that in Java.
15.
by joshefin 7y ago
The CO2 sensor would be a nice addition to my project. Do you have experience with the MH-Z19B, is it accurate enough for indoor use?
16.
by joshefin 7y ago
PMS7003, and most probably all other low-cost PM sensors with the same working principle, is not made to be used outdoors. Although used in many DIY projects for outdoor air quality monitoring, researches show that high humidity badly affec
17.
How to Measure Indoor Air Quality with a Raspberry Pi, RuuviTags and PMS7003(joshefin.xyz)
292 points by joshefin 7y ago|97 comments