MH-Z19B + MH-Z19C driver for MicroPython
This library implements a simple class to get data from the MH-Z19 Sensors
It will tell you
- PPM
- Room temperature (not very accurate) - not documented in Module Datasheet
- CO2 Status (whatever that is) - Neither documented in Module Datasheet
Author: Florian "overflo" Bittner - 12/2020
Version 0.1
License MIT
Some hints taken from: https://github.com/nara256/mhz19_uart/blob/master/src/MHZ19_uart.cpp https://emariete.com/en/sensor-co2-mh-z19b/#El_sensor_de_CO2_MH-Z19C
USE LIKE:
import mhz19
#init sensor on UART #1
sensor = mhz19.mhz19(1)
#update data from sensor
sensor.get_data()
print('ppm:', sensor.ppm)
print('temp:', sensor.temp)
print('status:', sensor.co2status)
CALIBRATE IF NEEDED:
#perform a manual zero point calibration (let it sit at 400pm for 20mins first)
sensor.calibrate_zero()
#enable/disable automatic zero point calibration, which depends on a daily drop
#to 400ppm to work
sensor.set_auto_calibrate_zero(True)