sigmasternchen/MH-Z-CO2-Sensors
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MH-Z14A, MH-Z19B CO2 ... Module

Arduino implementation for MH-Z CO2 sensors such as MH-Z14A, MH-Z19B and MH-Z19C (as I didn't find all info in one place).

The sensor is available for ~20 bucks at the usual places.

Implementation

See example.

PPMuart: 602, PPMpwm: 595, Temperature: 23

Implementation details

C ppm = 5000 * (T_high - 2 ms) / (T_high + T_low - 4ms)

The implementation is mostly based on https://forum.arduino.cc/index.php?topic=525459.msg3587557#msg3587557

Resources:

Datasheet (MH-Z19B): http://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf

Datasheet (MH-Z19C): https://pdf1.alldatasheet.com/datasheet-pdf/view/1303687/WINSEN/MH-Z19C.html

More info about the sensor: https://revspace.nl/MHZ19

Further reading:

(russuian, but google translate does a good job)