How to Measure ROOM CO2 concentration with 20$ sensor "MH-Z19" and Raspberry Pi
MH-Z19 CO2 concentration Sensor
This blog post is outdated. The updated version is here.
You can buy it at an online shop like eBay or aliexpress about 20$.
The electrical interface of this sensor is compatible with Raspberry Pi. So you can make your D.I.Y. CO2 Monitor with MH-Z19, Raspberry Pi, and MONITOR™.
The normal CO2 concentration is about 400ppm. In a poorly ventilated room, the CO2 concentration will soon increase and make you feel drowsy.
By ventilation, co2 concentration soon decrease and you can get your head refreshed.
You can check your room air freshness by yourself and can protect your health with this.
Activate a value element on the MONITOR™
Go to MONITOR™, then open Elements menu
At first, only one View Element is active
Change one of your Value Elements to Active and Save this setting.
Install & setting MH-Z19 software on your Raspberry Pi
After Raspberry Pi power on, MH-Z19 software running on the Raspberrry Pi, send CO2 concentration data to the MONITOR™ service at 5 minute interval.
On your Web Browser, MONITOR™ keep refresh the time-series chart.