3 ms·
> indoor air quality sensor system with co2 and pm levels What do you use for monitoring this? I've been looking for something decent here for a while now.
by emilburzo 6y ago
> indoor air quality sensor system with co2 and pm levels
What do you use for monitoring this? I've been looking for something decent here for a while now.
- acidburnNSA 6y agoI use a Esp8266 microcontroller reading a MH-Z14A NDIR CO2 sensor [1] and a Laser PM2.5 HM3301 from grove [2]. Pretty easy to code up in C. Once tge sensors data is read, the esp sends the it over the MQTT protocol on wifi to home assistant which puts them in SQL db and does plots and stuff. [1] https://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z14a_co2-manual-v1_01.pdf https://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh... [2] https://www.seeedstudio.com/Grove-Laser-PM2-5-Sensor-HM3301.html https://www.seeedstudio.com/Grove-Laser-PM2-5-Sensor-HM3301....
- ngcc_hk 6y agoInteresting as another proj
- emilburzo 6y agoMy DIY sensors[1] (temp/humidity) are running on attiny84 and 3xAAA batteries, which I really like as they last for about a year (sending updates every ~1 minute and then sleeping). But because I'm not using a voltage regulator, since that would mean losing the very nice onboard voltage monitor, it's been really hard to find some CO2/PM2.5 sensors that can work from ~5V to ~3.4V. > Working voltage 4.5 V ~ 5.5V DC > Operating Voltage 3.3V / 5V Guess I need to keep looking, but thanks for linking the specific models! [1] https://ambient.emilburzo.com/#overview https://ambient.emilburzo.com/#overview