Readit NewsFor CO2, which I've researched the most out of the various things that interest me, I'd want a Senseair K30 or S8 Commercial, an Amphenol Telaire T6613 or T6713, or a CozIR-A or CozIR-LP sensor.
For low cost, I'd go with the Senseair S8 Residential. It's not fantastically accurate but it's still a "real" sensor and you can get it for $20 from China.
For other aspects of air quality, I haven't finished researching the options yet.
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&sta...
Looks like it's using Prism.js: https://prismjs.com
Yes, Prism is great. Most of the blogs cramp the code in width, I let it spread it's wings full width.
I have never touched their air purifier, but I did three other gadgets (TV box, some indoor camera, some light bulbs).
If privacy is your concern, I wouldn't recommend them. If stability is your concern, I wouldn't recommend them.
The light bulb works with an app only (probably to remove the need for a separate hub), the camera could be rooted to work offline-only (which is why I bought it, but I gave up after a couple of shots and it's currently sitting in my drawer), and the TV box is by far the noisiest device in my local network. It's like 60% of all DNS requests blocked by my Pi-hole.
Their devices are also the most unstable devices I own, to the point where I'm considering just throwing them in the trash and re-investing in another camera and a TV box. I've already replaced the bulb I've purchased with a Philips Hue system. Quite more expensive, but truly works locally.
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.
I love the idea, but why in the name of the Flying Spaghetti Monster, would you use Java on an RPi? There are at least half a dozen python libs for the PMS7003.
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.
What's the RuuviTag for? I can't see it mentioned in the article.
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-pressure-with-ruuv...
An accurate CO2 sensor is much more expensive. I would not trust the readings of the sensor in this blog. It's going to be off by over 100ppm, especially if there's a lack of good airflow.
https://www.atlas-scientific.com/product_pages/probes/ezo-co...
I believe that some of the more expensive sensors are more accurate, but this cheap one may be a good enough solution in some cases (e.g. indoor air monitoring for DIY projects).