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https://github.com/sigmasternchen/MH-Z-CO2-Sensors
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![]() * correct the type of sensor in readme * fix overflow in int datatype in arduino Uno. In Uno, it's 16 bits in int variable. So I add a explicit type cast in MHZ.cpp file * fix the warning of implicit convert from hex to char. I change the data type to unit_8t, and it also helps to unify the datatype of these cmd arrays. |
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README.md |
MH-Z14A, MH-Z19B CO2 ... Module
Arduino implementation for MH-Z CO2 sensors such as MH-Z14A, MH-Z19B (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: http://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf
More info about the sensor: https://revspace.nl/MHZ19
Further reading:
(russuian, but google translate does a good job)