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Christoph Schultz 8a063e7c27 Add support for setting the range and autocalibration. Closes #1 . * added possibility to set Range, to enable/disable Autocalibrate and to calibrate maually ( see Datasheet v 1.2 : https://www.winsen-sensor.com/d/files/MH-Z14A.pdf * Update MHZ.cpp * Update MHZ.cpp * Update MHZ.h added calibrate Span, for complete functionality but commented out , due to professional use (req. constant atmosphere with 2k, 5k or 10k ppm CO2.). corrected the bugs in MHZ.cpp also. * Update MHZ.cpp Added comments for Sensors with specific firmware. Co-authored-by: Christoph Schultz <christoph@schultz1-christoph.de>		2021-01-14 22:28:47 +01:00
examples/MH-Z19B	implements various small fixes and improvements	2019-06-08 13:37:21 +02:00
.gitattributes	Initial commit	2018-04-22 11:36:51 +02:00
.gitignore	adds the entire .vscode folder to gitignore	2019-06-08 11:10:41 +02:00
keywords.txt	Use correct field separator in keywords.txt	2018-07-17 07:29:47 -07:00
library.properties	Update library.properties	2019-06-08 18:15:09 +02:00
LICENSE	Initial commit	2018-04-22 11:36:51 +02:00
MHZ.cpp	Add support for setting the range and autocalibration. Closes #1 .	2021-01-14 22:28:47 +01:00
MHZ.h	Add support for setting the range and autocalibration. Closes #1 .	2021-01-14 22:28:47 +01:00
README.md	Update README.md	2018-09-04 23:45:04 +02:00

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

C ppm = 5000 * (T_high - 2 ms) / (T_high + T_low - 4ms)

More info about the sensor: https://revspace.nl/MHZ19