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"] |
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Available on Raspberry Pi.