BH1750 Sensor issue - no readings

[jerpena]

Mycodo Issue Report:

• Specific Mycodo Version: 6.4.5(issue happening on 6.4.4 as well)

Problem Description

I have added a BH1750 light sensor in the Data page under setup but when looking at live page or trying to get sensor data it comes back with 0 lux and no data for the last 16 seconds. I am able to get the light readings from a separate python file so I know the sensor is in fact working.

A little about my setup:

I have a TCA9548A multiplexer connected per the instructions listed in your manual. I then have one BH1750 on smbus 5 and one on smbus 11. I can access both of these sensors with an independent python file unrelated to mycodo.

Errors

No errors are shown on the front end when activating, deactivating, or adding a BH1750. Unknown if errors are shown in logs as I am not sure where this would be.

Steps to Reproduce the issue:

How can this issue be reproduced? Add the sensor and activate it then look at the live data page to see no data coming in from the sensor.

Additional Notes

Is there anything that should be added to make it easier to address this issue?

[kizniche]

I am able to get the light readings from a separate python file

What file are you referring to?

[kizniche]

Are there any errors in the daemon log?

[jerpena]

I just used this to verify my sensor was working correctly. https://bitbucket.org/MattHawkinsUK/rpispy-misc/raw/master/python/bh1750.py

/var/log/mycodo/mycodo.log

2018-11-07 14:51:43,151 - mycodo.daemon - INFO - Mycodo daemon v6.4.5 starting 2018-11-07 14:51:43,216 - mycodo.daemon - DEBUG - Refreshing camera settings 2018-11-07 14:51:43,419 - mycodo.daemon - DEBUG - Refreshing misc settings 2018-11-07 14:51:43,452 - mycodo.daemon - INFO - Anonymous statistics enabled 2018-11-07 14:51:43,472 - mycodo.daemon - INFO - Starting rpyc server 2018-11-07 14:51:43,653 - mycodo.daemon - DEBUG - Starting Output controller 2018-11-07 14:51:43,685 - mycodo.output - DEBUG - Initializing Outputs 2018-11-07 14:51:43,735 - mycodo.output - DEBUG - Outputs Initialized 2018-11-07 14:51:43,736 - mycodo.output - INFO - Output controller activated in 81.9 ms 2018-11-07 14:51:44,238 - mycodo.daemon - DEBUG - Starting all activated Conditional controllers 2018-11-07 14:51:44,249 - mycodo.daemon - INFO - All activated Conditional controllers started 2018-11-07 14:51:44,250 - mycodo.daemon - DEBUG - Starting all activated Input controllers 2018-11-07 14:51:44,573 - mycodo.input_f30574d0 - INFO - Activated in 194.6 ms 2018-11-07 14:51:44,574 - mycodo.daemon - INFO - All activated Input controllers started 2018-11-07 14:51:44,575 - mycodo.daemon - DEBUG - Starting all activated Math controllers 2018-11-07 14:51:44,575 - mycodo.daemon - INFO - All activated Math controllers started 2018-11-07 14:51:44,576 - mycodo.daemon - DEBUG - Starting all activated PID controllers 2018-11-07 14:51:44,576 - mycodo.daemon - INFO - All activated PID controllers started 2018-11-07 14:51:44,576 - mycodo.daemon - DEBUG - Starting all activated LCD controllers 2018-11-07 14:51:44,577 - mycodo.daemon - INFO - All activated LCD controllers started 2018-11-07 14:51:45,078 - mycodo.daemon - INFO - Mycodo daemon started in 1.926 seconds 2018-11-07 14:51:45,093 - mycodo.daemon - INFO - 37.69 MB RAM in use 2018-11-07 14:52:15,274 - mycodo.input_f55c8332 - INFO - Activated in 236.0 ms 2018-11-07 14:53:45,196 - mycodo.stats - DEBUG - Sent anonymous usage statistics

that is the output of the log after a restart in debug mode and when I activated the sensor. I had previously deactivated it prior to starting in debug mode to see if any exceptions were thrown.

[kizniche]

Run this script and see if you can obtain a measurement:

https://gist.github.com/oskar456/95c66d564c58361ecf9f

[jerpena]

Run this script and see if you can obtain a measurement:

https://gist.github.com/oskar456/95c66d564c58361ecf9f

I was able to get this to run without any issues

[kizniche]

Try running it in a python 3 environment:

~/Mycodo/env/bin/python /path/to/script.py

[kizniche]

If that works, then try changing smbus to smbus2 and smbus.SMBus() to SMBus(), from the following ines:

import smbus

to

from smbus2 import SMBus

and

bus = smbus.SMBus(1)

to

bus = SMBus(1)

[jerpena]

Try running it in a python 3 environment:

~/Mycodo/env/bin/python /path/to/script.py

When trying to run the script you linked this way, I was unable to get it to load.

[kizniche]

Python 3 requires print statements to be encased in parentheses, so change:

print "blah {}".format(variable)

to

print("blah {}".format(variable))

[kizniche]

Here is the modified code for python 3 compatibility:

    while True:
        print("Sensitivity: {:d}".format(sensor.mtreg))
        for measurefunc, name in [(sensor.measure_low_res, "Low Res "),
                                  (sensor.measure_high_res, "HighRes "),
                                  (sensor.measure_high_res2, "HighRes2")]:
            print("{} Light Level : {:3.2f} lx".format(name, measurefunc()))
        print("--------")
        sensor.set_sensitivity((sensor.mtreg + 10) % 255)
        time.sleep(1)

[jerpena]

Ok after changing the code to be compliant, I was able to run the script and get output. I then changed what you asked:

smbus to smbus2 and smbus.SMBus() to SMBus(), from the following lines:

The script runs with the changes to smbus and gives me the lux output.

@Psych:~ $ ~/Mycodo/env/bin/python test.py
Sensitivity: 69 Low Res Light Level : 0.00 lx HighRes Light Level : 1.67 lx HighRes2 Light Level : 1.25 lx

[kizniche]

I think I found the issue, from a similar issue in #560

Change this line:

https://github.com/kizniche/Mycodo/blob/e7699f0cf408d77851c5d679f0a842a27337d44e/mycodo/inputs/bh1750.py#L94

to this:

        return dict(light=float('{0:.2f}'.format(self._lux)))

Save, restart the daemon, and your issue should be resolved.

[jerpena]

I have changed line 94 to:

return dict(light=float('{0:.2f}'.format(self._lux)))

but it did not change anything. I am still not able to get light readings on the live page.

[kizniche]

Then I'm not sure what the issue could be. Are you able to provide me with SSH access (user pi) and a Mycodo login (admin user)? If so, I can diagnose the issue from your Pi. You can contact me privately at http://kylegabriel.com/contact