mirror of
https://github.com/sigmasternchen/MH-Z-CO2-Sensors
synced 2025-03-15 06:38:55 +00:00
No description
![]() The literals for the preheating time are interpreted as int. On Arduino Uno an int is 2 bytes in size, ranging from -32,768 to 32,767. Therefore, the calculated number of 3*60*1000=180000 does not fit in. Added upper L to force the literal to long. |
||
---|---|---|
examples/MH-Z19B | ||
.gitattributes | ||
.gitignore | ||
keywords.txt | ||
library.properties | ||
LICENSE | ||
MHZ.cpp | ||
MHZ.h | ||
README.md |
MH-Z14A, MH-Z19B CO2 ... Module
Arduino implementation for MH-Z CO2 sensors such as MH-Z14A, MH-Z18B (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)