All written data values to Zero but PM10 running Sensly.py

[shivam11]

Hi,
I recently got a Sensly shield for my Raspberry Pi. I have installed it and configured it but I am only getting zero readings from the sensors.
Regards
Shivam

[Tusky]

Same for me, couldn't really contact them either. For a few queries the sensly get's data but after that it goes 0,0,0,00,0, and I/O Errors are thrown.

And there is a typo in the code where Methyl is called Metly which also might be an issue...

[phgachoud]

I/O Error is closed on the dev/issue6_remote_IO_Error branch cf. issue #7

[phgachoud]

A spec like that would be so great!!! http://kuehnast.com/s9y/archives/636-Measuring-Particulate-Matter-with-your-Raspberry-Pi.html Can't you take some time to do something please!!! the HAT you ordered has some spec no?? @frazer-altitude @samAlti

[fairypeace]

Hello,
I have the same problem and I can't find solution to different branch (#7).
Do you find how to do to resolve this problem ?

[phgachoud]

It seems about what I remember that the values are treated and with a big if method and if the values which got the sensors are in between ranges a number is given for each gaz. If its not the case a zero is written. So it is not basically that the gotten values from sensors are zeros but the interpretation of the values seems to be not working. To try with each gaz for test, I dont know if the first coder did it and it worked...

Feel free to contribute!!!!!

[fairypeace]

Hi.
I'm coming back because I have a little advance on the subject lately.
I changed the value of the constants MQ2R0, MQ7R0 and MQ135R0 by values ​​that I calculated from Sensly_Calibration records.
For the moment only MQ2 gives values ​​other than 0 but I have hope for the future.

[phgachoud]

@fairypeace nice! Thx, please add it to a pull request with a new branch so we can review it and add it to master

[fairypeace]

@phgachoud I don't know how to add it to a pull request with a new branch.
Sensly.zip
This is where I am for the moment.
I hope that somebody better like me with programm can find a solution.

[phgachoud]

@fairypeace http://lmgtfy.com/?q=how+to+create+pull+request+and+branches+with+git

[hansharhoff]

@phgachoud Hi, did you ever get meaningful values out of the sensors? Do you know if anyone ever did?

[phgachoud]

@hansharhoff Actually I dont know, I didn't investigate on that topic more than seeing that the getted values of sensors are passing through a method which is returning zeros if sensors values are less than a given threshold... Did not get any answer from @samAlti about that.... feel free to test them and see if the raw values are different from the returned from the method.

The given methods are into Get_MQ2PPM, Get_MQ7PPM, Get_MQ135PPM, take a look @ them. Actually I just added some logging informations into Sensly.py and Sensors.py about that

[ferazambuja]

Same over here and same for calibration.

2018-03-29 22:41:39.502 DEBUG Sensly - save_read_data_to_csv: BME280 read temperature is (Carefull, hat is hot so temp is not corrected by default):204.719685108 2018-03-29 22:41:39.502 DEBUG Sensly - save_read_data_to_csv: BME280 read humidity is (Carefull, hat is hot so temp is not corrected by default):0 2018-03-29 22:41:39.503 DEBUG Sensors - Get_rawdata: Writting byte 5 with index 1 2018-03-29 22:41:39.518 DEBUG Sensors - Get_rawdata: Read byte is '1' 2018-03-29 22:41:39.531 DEBUG Sensors - Get_rawdata: Read byte is '107' 2018-03-29 22:41:39.532 DEBUG Sensors - Get_rawdata: Raw Data returned value is 363 2018-03-29 22:41:40.834 DEBUG Sensors - Get_rawdata: Writting byte 5 with index 2 2018-03-29 22:41:40.850 DEBUG Sensors - Get_rawdata: Read byte is '7' 2018-03-29 22:41:40.863 DEBUG Sensors - Get_rawdata: Read byte is '244' 2018-03-29 22:41:40.863 DEBUG Sensors - Get_rawdata: Raw Data returned value is 2036 2018-03-29 22:41:42.166 DEBUG Sensors - Get_rawdata: Writting byte 5 with index 3 2018-03-29 22:41:42.181 DEBUG Sensors - Get_rawdata: Read byte is '0' 2018-03-29 22:41:42.194 DEBUG Sensors - Get_rawdata: Read byte is '35' 2018-03-29 22:41:42.195 DEBUG Sensors - Get_rawdata: Raw Data returned value is 35 2018-03-29 22:41:42.196 DEBUG Sensly - save_read_data_to_csv: Gases are followings MQ2 [0, 0, 0, 0, 0, 0] MQ7 [0, 0, 0, 0, 0] MQ135 [0, 0, 0, 0, 0, 0]