2018-09-04 20:44:22 +00:00
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# MH-Z14A, MH-Z19B CO2 ... Module
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2018-04-22 09:51:44 +00:00
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2018-09-04 20:43:56 +00:00
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Arduino implementation for MH-Z CO2 sensors such as **MH-Z14A**, **MH-Z18B** (as I didn't find all info in one place).
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2018-04-22 09:51:44 +00:00
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The sensor is available for ~20 bucks at the usual places.
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2018-09-04 21:45:04 +00:00
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## Implementation
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See example.
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2018-04-22 09:51:44 +00:00
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2018-09-04 21:45:04 +00:00
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> PPMuart: 602, PPMpwm: 595, Temperature: 23
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2018-04-22 09:51:44 +00:00
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2018-09-04 21:45:04 +00:00
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### Implementation details
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2018-04-22 09:51:44 +00:00
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2018-04-22 10:11:58 +00:00
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```
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C ppm = 5000 * (T_high - 2 ms) / (T_high + T_low - 4ms)
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```
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2018-04-22 09:51:44 +00:00
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The implementation is mostly based on https://forum.arduino.cc/index.php?topic=525459.msg3587557#msg3587557
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2018-09-04 21:45:04 +00:00
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## Resources:
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Datasheet:
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http://www.winsen-sensor.com/d/files/infrared-gas-sensor/mh-z19b-co2-ver1_0.pdf
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More info about the sensor:
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https://revspace.nl/MHZ19
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2018-04-22 09:51:44 +00:00
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## Further reading:
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- http://ihormelnyk.com/Page/mh-z19_co2_meter
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(russuian, but google translate does a good job)
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- https://geektimes.ru/post/285572/
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2018-09-04 20:43:56 +00:00
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- https://geektimes.ru/post/278178/
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