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UedaTakeyuki / mh-z19

Read CO2 concentration from mh-z19 sensor on the Raspberry Pi & handle it. Detect Raspberry Pi model automatically and read the value from an appropriate serial device.
MIT License
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Add additional value for detection range #19

Closed WO15 closed 4 years ago

WO15 commented 4 years ago

Currently there are 2 detection ranges you can select/set 2000ppm and 5000ppm see https://github.com/UedaTakeyuki/mh-z19/wiki/CALIBRATION-&-detection-range in the datasheet v1.5 in chapter 5 on page 5 there are 3 ranges indicated 2000, 5000 and 10.000. Would it be possible to add the 10.000ppm range as a "detection_range_10000()" command to the code? on page 8 of the datasheet the details are given. Set 0~10000ppm detection range, send command: FF 01 99 00 00 00 27 10 2F

UedaTakeyuki commented 4 years ago

Hi WO15,

Thank you for your kind suggestion. I'll implement it soon.

UedaTakeyuki commented 4 years ago

Hi WO15,

I've added the --detection_range_10000 option and updated both github and pypi.

WO15 commented 4 years ago

Upgraded the python package on a Raspberry and tested the 2k, 5k and 10k range setting. Placed the sensor connected with long wires in a drinking glass and exhaled on it for approx 1 minute. Exhaled air contains approx 4% (40k ppm CO2). Did this 3 times for all 3 ranges, the read out values maxed out at the max value for each range set. So the --detection_range_xxxx option for all 3 ranges seems to work OK.