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MH-Z19 CO2 Sensor reading.
# http://eleparts.co.kr/data/design/product_file/SENSOR/gas/MH-Z19_CO2%20Manual%20V2.pdf
# http://qiita.com/UedaTakeyuki/items/c5226960a7328155635f
import serial
import time
def mh_z19():
ser = serial.Serial('/dev/ttyAMA0',
baudrate=9600,
bytesize=serial.EIGHTBITS,
parity=serial.PARITY_NONE,
stopbits=serial.STOPBITS_ONE,
timeout=1.0)
while 1:
result=ser.write("\xff\x01\x86\x00\x00\x00\x00\x00\x79")
s=ser.read(9)
if s[0] == "\xff" and s[1] == "\x86":
return {'co2': ord(s[2])*256 + ord(s[3])}
break
if __name__ == '__main__':
value = mh_z19()
print "co2=", value["co2"]
@UedaTakeyuki

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commented Feb 13, 2016

Available on Raspberry Pi.

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