MH-Z-CO2-Sensors/README.md
2021-11-27 23:02:09 +01:00

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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:
- http://ihormelnyk.com/Page/mh-z19_co2_meter
(russuian, but google translate does a good job)
- https://geektimes.ru/post/285572/
- https://geektimes.ru/post/278178/