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Tobias Schürg 4d8878bde4
Merge pull request #4 from flatsiedatsie/patch-1 
Save some memory
2018-09-10 22:16:24 +02:00
examples/MH-Z19B Removed duplicated example. 2018-09-05 00:00:31 +02:00
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.gitignore Added isPreheating and isReady to MHZ.h and reformatted. 2018-07-07 12:59:32 +02:00
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library.properties Updated description. 2018-09-07 00:03:33 +02:00
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MHZ.cpp Save some memory 2018-09-10 20:41:05 +02:00
MHZ.h Implemented isPreHeating and isReady. 2018-07-07 16:05:40 +02:00
README.md Update README.md 2018-09-04 23:45:04 +02:00

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)