[Barrow4491]

Werk,
Below is the code from the serial monitor of the CO2 sensor; every time it does a read it returns an error.
...

Hi Jim,

Sorry for the late reply.
Usually a read error is caused by problems with the serial connection to the sensor.
If you want you can try the attached MH-Z19 test software. It tries to read the MH-Z19 at each 8 seconds, and outputs data to the LCD and the Serial Monitor.
There is no need to do any configuration, it works with models A and B.

Werk,
I downloaded and ran the test and below is the result; as you can see it appears to have come good after an initial error read???
 I have reloaded the software and it appears OK at the moment and i will leave it run and let you know the results
Regards
Jim

Code:

21,10,1C,FC,5,6C,11,3,24,
Calculated crc: 53
Wrong reply from CO2 sensor!

FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


Sensor Operational

FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,1,9A,45,0,0,0,9A,
Calculated crc: 9A
CO2 read: 410 - Temp: 29 - Stabile: 0


FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,2,1F,46,0,0,0,13,
Calculated crc: 13
CO2 read: 543 - Temp: 30 - Stabile: 0


FF,86,2,1C,46,0,0,0,16,
Calculated crc: 16
CO2 read: 540 - Temp: 30 - Stabile: 0


FF,86,2,28,46,0,0,0,A,
Calculated crc: A
CO2 read: 552 - Temp: 30 - Stabile: 0


FF,86,2,2F,46,0,0,0,3,
Calculated crc: 3
CO2 read: 559 - Temp: 30 - Stabile: 0


FF,86,2,33,45,0,0,0,0,
Calculated crc: 0
CO2 read: 563 - Temp: 29 - Stabile: 0

21,10,1C,FC,5,6C,11,3,24,
Calculated crc: 53
Wrong reply from CO2 sensor!

FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


Sensor Operational

FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,1,9A,45,0,0,0,9A,
Calculated crc: 9A
CO2 read: 410 - Temp: 29 - Stabile: 0


FF,86,1,9A,46,0,0,0,99,
Calculated crc: 99
CO2 read: 410 - Temp: 30 - Stabile: 0


FF,86,2,1F,46,0,0,0,13,
Calculated crc: 13
CO2 read: 543 - Temp: 30 - Stabile: 0


FF,86,2,1C,46,0,0,0,16,
Calculated crc: 16
CO2 read: 540 - Temp: 30 - Stabile: 0


FF,86,2,28,46,0,0,0,A,
Calculated crc: A
CO2 read: 552 - Temp: 30 - Stabile: 0


FF,86,2,2F,46,0,0,0,3,
Calculated crc: 3
CO2 read: 559 - Temp: 30 - Stabile: 0


FF,86,2,33,45,0,0,0,0,
Calculated crc: 0
CO2 read: 563 - Temp: 29 - Stabile: 0