When HN users recommended it
1 HN user recommended this in 2018, in one comment.
20072026
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
1 HN user recommended this in 2018, in one comment.
Each tall tick is one HN user's first recommendation. A short tick is the same user again. Click a tick to jump to the comment.
I saw quite a few arduino sensors so you could build your own. I've linked a couple, but I haven't bought them yet.
https://www.amazon.com/KEYESTUDIO-Particle-Monitor-Arduino-R...
https://www.amazon.com/Keywish-Detector-Mega2560-Raspberry-B...