Calibration script fails retrieving data

[X4LD1M0]

1. Installed latest Raspian Jessie 2017-04-10 on Raspberry Pi 2
2. Followed Instructable procedure
3. Run the script Sensly_Dev_Install.sh
4. Run the script Sensly_Calibration.py

At this point it fails and gives the following output:
Traceback (most recent call last):
File "Sensly/Sensly_Calibration.py", line 60, in
AvRs_MQ7 = AvRs_MQ7 + MQ7.Get_RS(MQ7cmd)
File "/root/Sensly/Sensors.py", line 58, in Get_RS
self.RS = ((float(self.MaxADC)/float(self.Get_rawdata(cmd))-1)*self.RLOAD)
File "/root/Sensly/Sensors.py", line 46, in Get_rawdata
self._device.write_byte(I2C_Addr,cmd)
IOError: [Errno 121] Remote I/O error

When running the i2cdetect command it shows 05, but sometimes also 06 and 07.

[Sam-AlteredCarbon]

Hi has this happened more than once, if you email me at sam@altitude.pw I can give you more help

[phgachoud]

Got same error..., did you solve it?? Please post if it was the case...

[X4LD1M0]

Unfortunately not. I don't get much response from them. Seems I have wasted the money for it.

[Sam-AlteredCarbon]

Hi guys, sorry for the delayed response, can you let me know which version of rapsbian you are running?

[phgachoud]

Distributor ID: Raspbian
Description: Raspbian GNU/Linux 9.1 (stretch)
Release: 9.1
Codename: stretch
Raspberry Pi 2 Model B Rev 1.1 (cat /proc/device-tree/model)
Linux piTest 4.9.52-v7+ #1038 SMP Fri Sep 29 16:26:52 BST 2017 armv7l GNU/Linux
Latest raspbian image and update... think you could reproduce it, tried to debug the script... not found yet. I had to resolder the pins on the captors which were desoldered. For the moment Am not really happy with the 70$ I paid.... sorry...

1. Is there a way to get some documentation about the HAT so that I can help debugging?? in case contact me directly on ph.gachoud@gmail.com
2. Is there a way to get @ least a PI image so that we can test it?

2017-10-05 20:00:22.315 WARNING Sensly_Calibration - <module>: Starting calibration
2017-10-05 20:00:22.316 DEBUG Sensors - Get_rawdata: Writting byte:5cmd:1
2017-10-05 20:00:22.338 WARNING Sensly_Calibration - <module>: Got first data
2017-10-05 20:00:22.349 DEBUG Sensors - Get_rawdata: Writting byte:5cmd:2
Traceback (most recent call last):
  File "Sensly_Calibration.py", line 71, in <module>
    AvRs_MQ7 = AvRs_MQ7 + MQ7.Get_RS(MQ7cmd)
  File "/home/pi/Sensly/Sensors.py", line 66, in Get_RS
    self.RS = ((float(self.MaxADC)/float(self.Get_rawdata(cmd))-1)*self.RLOAD)
  File "/home/pi/Sensly/Sensors.py", line 54, in Get_rawdata
    self._device.write_byte(I2C_Addr,cmd)
IOError: [Errno 121] Remote I/O error

Got the same error on a Raspberry PI 3, with fresh image... with my debug added got following error:

2017-10-09 13:42:30.499 DEBUG Sensly_Calibration - <module>: start of script
2017-10-09 13:42:30.500 DEBUG Sensly_Calibration - <module>: debug test this is logged as debug level
2017-10-09 13:42:31.505 DEBUG Sensly_Calibration - <module>: Before file open
2017-10-09 13:42:31.507 WARNING Sensly_Calibration - <module>: Before sleep
2017-10-09 13:42:32.509 DEBUG Sensly_Calibration - <module>: Entering loop While True
2017-10-09 13:42:32.510 DEBUG Sensly_Calibration - <module>: Starting calibration
2017-10-09 13:42:32.510 DEBUG Sensors - Get_rawdata: Writting byte:5 cmd:1
2017-10-09 13:42:32.532 DEBUG Sensors - Get_rawdata: Data[0] got:17
2017-10-09 13:42:32.533 DEBUG Sensly_Calibration - <module>: Got first data AvRs_MQ2:2398823.52941
2017-10-09 13:42:32.544 DEBUG Sensly_Calibration - <module>: Trying to get Data from MQ7
2017-10-09 13:42:32.545 DEBUG Sensors - Get_rawdata: Writting byte:5 cmd:2
Traceback (most recent call last):
  File "Sensly_Calibration.py", line 72, in <module>
    AvRs_MQ7 = AvRs_MQ7 + MQ7.Get_RS(MQ7cmd)
  File "/home/pi/Sensly/Sensors.py", line 67, in Get_RS
    self.RS = ((float(self.MaxADC)/float(self.Get_rawdata(cmd))-1)*self.RLOAD)
  File "/home/pi/Sensly/Sensors.py", line 54, in Get_rawdata
    self._device.write_byte(I2C_Addr,cmd)
IOError: [Errno 121] Remote I/O error

[gesaleh]

I'm having the same issue

Traceback (most recent call last):
  File "Sensly_Calibration.py", line 65, in <module>
    AvRs_MQ7 = AvRs_MQ7 + MQ7.Get_RS(MQ7cmd)
  File "/home/pi/Sensly/Sensors.py", line 58, in Get_RS
    self.RS = ((float(self.MaxADC)/float(self.Get_rawdata(cmd))-1)*self.RLOAD)
  File "/home/pi/Sensly/Sensors.py", line 46, in Get_rawdata
    self._device.write_byte(I2C_Addr,cmd)
IOError: [Errno 121] Remote I/O error

[phgachoud]

Not having any news from the team AltitudeTech, I'm debugging the script & finally got something working but need more investigation to follow... Not having any right on the git repository you can find a fork on mine: https://github.com/phgachoud/Sensly Don't hesitate to make me request so we can contribute to a working library!!!

[Sam-AlteredCarbon]

@phgachoud my colleague will be in touch shortly to thank you for helping out with this issue and I shall be adding you as a contributor now.

[phgachoud]

Pushed as branch for the moment as gpio_calibration_fix, Sensly_Calibration.py working on my pi, but Sensly.py not for the moment, will do a merge when done... problem was solved resetting the GPIO before a write_byte, dont know if its a workaround, am new to python, raspberry pi & GPIOs...

[Sam-AlteredCarbon]

Thanks phgacloud, when I wrote the code I tested it on both the pi 2 and pi 3 and didn't have this problem, I suspect since writing it, the i2c library has been updated changing the operation of the code. Have you tried adding a 100ms delay after each read, that might also improve the reliabliity.

[phgachoud]

Hi, thx for the tip, I think something changed, What I did is resetting the GPIO interface before every call on a gaz sensor, temperature seems to be working 1 on 5 times and square gas sensor (Sharp) not @ all, going further with my investigations, waiting more did not do the trick for me.

…

On Mon, Nov 6, 2017 at 2:41 PM, samAlti ***@***.***> wrote: Thanks phgacloud, when I wrote the code I tested it on both the pi 2 and pi 3 and didn't have this problem, I suspect since writing it, the i2c library has been updated changing the operation of the code. Have you tried adding a 100ms delay after each read, that might also improve the reliabliity. — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#3 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ALBUDDv2IrmXF3AWLU7POAADXmRyLaYLks5szwyBgaJpZM4NUe8q> .

-- ********************************************** Philippe Gachoud Montsoflo 60 1634 La Roche 077/430.70.72 ph.gachoud@gmail.com **********************************************

[phgachoud]

Seems to be working on PI2 on the branch I created

[Sam-AlteredCarbon]

Ok, so it must be something to do with the way the i2c peripheral is configured in the rapsberry pi 3

[phgachoud]

Nope, I tested both 2 & 3 and none was working. Actually my fix is working on the 2 I did not test it on the 3...

[phgachoud]

Tested the Sensly_Calibration.py all night long (9930 times), seems to be working, I think we can close this issue for the moment... the question is if you want to merge this branch with head...?