[Steve1506]

I now have my AQM working but I am getting a very high CO2 reading around 2000 when operating in my workshop. Is this to be expected ??

Seems a very high value even when working indoors.
Please check in the software if the selected model corresponds to the model of your CO2 sensor. There are two models, A and B.

Werk,
Thanks for the reply the label on the sensor says its a MH-Z19B but I have tried changing the software and get similar results. Reading the serial monitor it seems ti be fine then gives a high reading and stays that way. See data below. Do you think the sensor is faulty.

set as MH-Z19

Code:

 WeatherDuino 4Pro
Air Quality Monitor v8.0 b001

Please wait 30s
Configuring CO2 Sensor
Setting measurement range to: 5000
FF,99,1,0,0,0,0,0,66,
66,66
Measurement range changed!
Disabling ABC Funtion
Reseting Sensor
EF,AF,29,FE,0,0,0,1,0,
Calculated crc: 29
Wrong reply from CO2 sensor!
FF,86,1,9A,3B,0,0,0,A4,
Calculated crc: A4
CO2 read: 431 - Temp: 19

FF,86,1,9A,3B,0,0,0,A4,
Calculated crc: A4
CO2 read: 431 - Temp: 19

FF,86,1,9A,3B,0,0,0,A4,
Calculated crc: A4
CO2 read: 431 - Temp: 19

FF,86,1,9A,3B,0,0,0,A4,
Calculated crc: A4
CO2 read: 431 - Temp: 19

FF,86,1,9A,3C,0,0,0,A3,
Calculated crc: A3
CO2 read: 431 - Temp: 20

FF,86,1,9A,3C,0,0,0,A3,
Calculated crc: A3
CO2 read: 431 - Temp: 20

FF,86,1,9A,3C,0,0,0,A3,
Calculated crc: A3
CO2 read: 431 - Temp: 20

FF,86,5,AC,3C,0,0,0,8D,
Calculated crc: 8D
CO2 read: 1526 - Temp: 20

FF,86,5,9B,3C,0,0,0,9E,
Calculated crc: 9E
CO2 read: 1508 - Temp: 20

Init MH-Z19 Ended


Waking up the dust sensor...
Reading will be done 40s later.

Reading the dust sensor...

PMS7003 readings:
PM2.5: 2.39 ug/m3
PM10 : 2.39 ug/m3
PM2.5_1H_Avg : 2.39
PM2.5_NowCast: 2.39

FF,86,4,FE,3D,0,0,0,3B,
Calculated crc: 3B
CO2 read: 1302 - Temp: 21

Set as MH-Z19B
 WeatherDuino 4Pro
Air Quality Monitor v8.0 b001

Please wait 30s
Configuring CO2 Sensor
Setting measurement range to: 5000
FF,99,1,0,0,0,0,0,66,
66,66
Measurement range changed!
Disabling ABC Funtion
Reseting Sensor
21,10,1C,FC,0,1,0,71,0,
Calculated crc: 66
Wrong reply from CO2 sensor!
FF,86,1,9A,3E,0,0,0,A1,
Calculated crc: A1
CO2 read: 431 - Temp: 22

FF,86,1,9A,3E,0,0,0,A1,
Calculated crc: A1
CO2 read: 431 - Temp: 22

FF,86,1,9A,3E,0,0,0,A1,
Calculated crc: A1
CO2 read: 431 - Temp: 22

FF,86,1,9A,3E,0,0,0,A1,
Calculated crc: A1
CO2 read: 431 - Temp: 22

FF,86,1,9A,3E,0,0,0,A1,
Calculated crc: A1
CO2 read: 431 - Temp: 22

FF,86,1,9A,3E,0,0,0,A1,
Calculated crc: A1
CO2 read: 431 - Temp: 22

FF,86,1,9A,3E,0,0,0,A1,
Calculated crc: A1
CO2 read: 431 - Temp: 22

FF,86,3,ED,3E,0,0,0,4C,
Calculated crc: 4C
CO2 read: 1056 - Temp: 22

FF,86,3,E7,3E,0,0,0,52,
Calculated crc: 52
CO2 read: 1050 - Temp: 22

Init MH-Z19 Ended


Waking up the dust sensor...
Reading will be done 40s later.

Reading the dust sensor...

PMS7003 readings:
PM2.5: 0.00 ug/m3
PM10 : 0.68 ug/m3
PM2.5_1H_Avg : 0.00
PM2.5_NowCast: 0.00

FF,86,3,FE,3E,0,0,0,3B,
Calculated crc: 3B
CO2 read: 1038 - Temp: 22

Steve D