CCS811 issue and SCD30 discussion

[infinisean]

Hi All. New here so please be gentle :)

I have a new Pi4b with the latest version of Mycodo and Buster and my CCS811 sensor will not read any data. It works fine in Arduino code and also on the CLI with the included python library and test script (see below).

Any guidance as to what I could be doing wrong would be greatly appreciated. Any other specific info you need to help troubleshoot, please let me know and I will get it posted right away.

Thanks!

--Sean

Describe the problem/bug

ccs811 sensor is setup and activated but it will not read any data.

i2c address is detected correctly in Mycodo (5a) and matches what i2cdetect shows on the CLI

pi@MushPi4:/var/log $ sudo i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- -- -- -- -- -- 10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- 5a -- -- -- -- -- 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- --

It also shows "sensor error" in daemon logs

2020-06-03 05:38:42,991 - ERROR - mycodo.controllers.controller_input_25f3fb05 - StopIteration raised 3 times. Possibly could not read input. Ensure it's connected properly and detected. 2020-06-03 05:38:46,023 - ERROR - mycodo.inputs.ccs811_25f3fb05 - Sensor error 2020-06-03 05:38:49,068 - ERROR - mycodo.inputs.ccs811_25f3fb05 - Sensor error

Using the simple test script provided with the library works fine from the command-line: (py3) pi@MushPi4:~ $ python3 ccs.py CO2: 0 PPM, TVOC: 0 PPB CO2: 0 PPM, TVOC: 0 PPB CO2: 434 PPM, TVOC: 5 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 424 PPM, TVOC: 3 PPB CO2: 424 PPM, TVOC: 3 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 428 PPM, TVOC: 4 PPB CO2: 434 PPM, TVOC: 5 PPB

A clear and concise description of what you were trying to do and what the problem/bug is.

Versions:

Mycodo Version: 8.5.2 Python Version: 3.7.3 (default, Dec 20 2019, 18:57:59) [GCC 8.3.0] Database Version: 840c4d18e38c Daemon Status: Running Frontend RAM Usage: 63.9 MB Frontend Virtualenv: Yes

• Raspberry Pi Version: [4B]
• Raspbian OS Version: [Buster Lite]

Reproducibility

Please list specific setup details that are involved and the steps to reproduce the behavior:

Add data input for CCS811 in Mycodo, configure, activate (all done successfully) Check live data (none) and logs (error pasted above)

Expected behavior

See valid data...

Screenshots

The data above should be sufficient but I am willing to provide anything else specifically needed

[kizniche]

What is ccs.py?

[infinisean]

That is the simple test script included with the library which works fine on the CLI (so I know the hardware , library and wiring are good)

[kizniche]

do you have a link or attachment?

[infinisean]

Guide: https://learn.adafruit.com/adafruit-ccs811-air-quality-sensor/raspberry-pi-wiring-test

Git: git clone https://github.com/adafruit/Adafruit_CCS811_python.git cd Adafruit_CCS811_python/examples sudo python CCS811_example.py

Code:

#this example reads and prints CO2 equiv. measurement, TVOC measurement, and temp every 2 seconds

from time import sleep
from Adafruit_CCS811 import Adafruit_CCS811

ccs =  Adafruit_CCS811()

while not ccs.available():
        pass
temp = ccs.calculateTemperature()
ccs.tempOffset = temp - 25.0

while(1):
        if ccs.available():
            temp = ccs.calculateTemperature()
            if not ccs.readData():
              print "CO2: ", ccs.geteCO2(), "ppm, TVOC: ", ccs.getTVOC(), " temp: ", temp

            else:
              print "ERROR!"
              while(1):
                pass
        sleep(2)

[kizniche]

The issue is likely from my attempt to set the bus number:

https://github.com/kizniche/Mycodo/blob/09f451f19eaf9d14a3cab876593edfab70730b48/mycodo/inputs/ccs811.py#L64-L66

You can try removing "busnum=self.i2c_bus", saving, restarting the backend, and seeing if it works.

[kizniche]

Though, it should work (see below).

https://github.com/adafruit/Adafruit_CCS811_python/blob/b75196d2f887247a316a631b81c4a909da395f3d/Adafruit_CCS811/Adafruit_CCS811.py#L58-L59

https://github.com/adafruit/Adafruit_CCS811_python/blob/b75196d2f887247a316a631b81c4a909da395f3d/Adafruit_CCS811/Adafruit_CCS811.py#L65-L69

https://github.com/adafruit/Adafruit_Python_GPIO/blob/a12fee39839665966bd124fd22588b2c87ced9d2/Adafruit_GPIO/I2C.py#L59-L66

[infinisean]

I actually switched to another sensor (SCD30) which has Temp, Humidity and CO2 all in one and is more accurate (via infrared CO2 measurement) and also more stable than the CCS811.

I'm currently using the linux bash command to query a RAM-based file the sensor's driver creates with all the values and it is working beautifully, though native sensor support would obviously be cleaner and more user friendly.

If you'd be interested in adding support for this sensor, I'd be happy to provide you with any information you need from my working environment to do so as it is a fantastic sensor.

[kizniche]

Do you have any links to literature on the SCD30 and what specific board/sensor(s) you're using?

[infinisean]

This is the library I am using (which creates a file in RAM with the 3 values to read with grep / awk)

https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library

This is the board:

https://www.sparkfun.com/products/15112

Datasheet

https://cdn.sparkfun.com/assets/1/a/7/9/9/Sensirion_CO2_Sensors_SCD30_Preliminary-Datasheet.pdf

Interface

https://cdn.sparkfun.com/assets/f/e/d/0/1/Sensirion_CO2_Sensors_SCD30_Interface_Description.pdf

Everything you need is in the driver though as it is accessed via I2C.

Let me know what else I can get for you from my working environment.

Happy to help

--Sean

On 6/11/2020 1:55 PM, Kyle Gabriel wrote:

Do you have any links to literature on the SCD30 and what specific board/sensor(s) you're using?

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[kizniche]

You linked to what appears to be an arduino library. Are you not using it on a Raspberry Pi?

[kizniche]

From your description of how you're reading the sensor, it appears you're using this: https://github.com/UnravelTEC/Raspi-Driver-SCD30

[kizniche]

Could you possibly test this? https://github.com/postronium/SCD30-Raspberry-Pi

[kizniche]

Okay, I've given up on that library and am using Raspi-Driver-SCD30. Can you provide the output from the command cat /run/sensors/scd30/last?

[kizniche]

Better yet, can you add this code to the file ~/test_read_scd30.py, execute it with ~/Mycodo/env/bin/python ~/test_read_scd30.py, and copy/paste the exact output?

with open('/run/sensors/scd30/last') as scd30_read:
    print(scd30_read.read())

[infinisean]

Yes, I should be able to do this tomorrow. I'll get back to you with results.

On 6/15/2020 9:02 PM, Kyle Gabriel wrote:

Better yet, can you add this code to the file |~/test_read_scd30.py| and execute it with |~/Mycodo/env/bin/python ~/test_read_scd30.py|?

with open('/run/sensors/scd30/last')as scd30_read: print("'{}'".format(scd30_read.read()))

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[infinisean]

pi@MushPi4:~/Mycodo/env/bin $ cat /run/sensors/scd30/last

gas_ppm{sensor="SCD30",gas="CO2"} 1544.25573730 temperature_degC{sensor="SCD30"} 29.05889893 humidity_rel_percent{sensor="SCD30"} 78.48205566

On 6/15/2020 8:40 PM, Kyle Gabriel wrote:

Okay, I've given up on that library and am using Raspi-Driver-SCD30. Can you provide the output from the command |cat /run/sensors/scd30/last|?

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[kizniche]

Attached is a module for testing. First, rename it from .txt to .py, then you can import it from the Configure -> Inputs page. Then, add it from the Setup -> Data page. You can enable Log Level: Debug in the Input options to see debug line output in the Daemon Log.

scd30.py.txt

[infinisean]

I did that but I am getting an error saying unmet dependencies (pigpiod) but I have that installed.,.

pi@MushPi4:~/Mycodo $ grep -i pigpio ../installed libpigpio-dev/testing,now 1.71-0~rpt1 armhf [installed] libpigpio1/testing,now 1.71-0~rpt1 armhf [installed] libpigpiod-if-dev/testing,now 1.71-0~rpt1 armhf [installed] libpigpiod-if1/testing,now 1.71-0~rpt1 armhf [installed] libpigpiod-if2-1/testing,now 1.71-0~rpt1 armhf [installed] pigpio-tools/testing,now 1.71-0~rpt1 armhf [installed] pigpio/testing,now 1.71-0~rpt1 armhf [installed] pigpiod/testing,now 1.71-0~rpt1 armhf [installed] python-pigpio/testing,now 1.71-0~rpt1 all [installed] python3-pigpio/testing,now 1.71-0~rpt1 all [installed]

On Wed, Jun 17, 2020 at 7:21 PM Kyle Gabriel notifications@github.com wrote:

Attached is a module for testing. You can import it from the Configure -> Inputs page, then add it from the Setup -> Data page. You can enable Log Level: Debug in the Input options to see debug line output in the Daemon Log.

scd30.py.txt https://github.com/kizniche/Mycodo/files/4795504/scd30.py.txt

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[kizniche]

If you didn't install pigpiod from Mycodo, it doesn't know it's installed, since Mycodo handles setting the sample rate. Go ahead and let Mycodo install pigpio, as this will fulfill the dependency and shouldn't pose an issue for anything else using pigpiod.

[infinisean]

Kyle,

Sorry I haven't gotten back to you in a while... had some family stuff going on so I am just now getting back to this project.

I'll give the pigpiod a shot tomorrow and let you know what I find with that. Thanks for the info.

Just ran into a strange issue trying to get my first PID working... was hoping you might be able to point me in the right direction how to troubleshoot something like this.

2020-07-06 23:55:29,662 - ERROR - mycodo.controllers.controller_pid_f72bde02 - Exception executing check_pid() on attempt 2 of 3. Waiting 10 seconds and trying again. Traceback (most recent call last): File "/var/mycodo-root/mycodo/controllers/base_controller.py", line 124, in attempt_execute func() File "/var/mycodo-root/mycodo/controllers/controller_pid.py", line 316, in check_pid duration_sec=self.setpoint_tracking_max_age) File "/var/mycodo-root/mycodo/utils/influx.py", line 468, in read_last_influxdb measure=measure, duration_sec=duration_sec, value='LAST') File "/var/mycodo-root/mycodo/utils/influx.py", line 440, in read_influxdb_single last_measurement = client.query(query).raw File "/var/mycodo-root/env/lib/python3.7/site-packages/influxdb/client.py", line 518, in query expected_response_code=expected_response_code File "/var/mycodo-root/env/lib/python3.7/site-packages/influxdb/client.py", line 369, in request raise InfluxDBClientError(err_msg, response.status_code) influxdb.exceptions.InfluxDBClientError: 400: {"error":"error parsing query: found s, expected ; at line 1, char 151"} 2020-07-06 23:55:39,749 - ERROR - mycodo.controllers.controller_pid_f72bde02 - Exception executing check_pid() on attempt 3 of 3. Traceback (most recent call last): File "/var/mycodo-root/mycodo/controllers/base_controller.py", line 124, in attempt_execute func() File "/var/mycodo-root/mycodo/controllers/controller_pid.py", line 316, in check_pid duration_sec=self.setpoint_tracking_max_age) File "/var/mycodo-root/mycodo/utils/influx.py", line 468, in read_last_influxdb measure=measure, duration_sec=duration_sec, value='LAST') File "/var/mycodo-root/mycodo/utils/influx.py", line 440, in read_influxdb_single last_measurement = client.query(query).raw File "/var/mycodo-root/env/lib/python3.7/site-packages/influxdb/client.py", line 518, in query expected_response_code=expected_response_code File "/var/mycodo-root/env/lib/python3.7/site-packages/influxdb/client.py", line 369, in request raise InfluxDBClientError(err_msg, response.status_code) influxdb.exceptions.InfluxDBClientError: 400: {"error":"error parsing query: found s, expected ; at line 1, char 151"} 2020-07-06 23:55:49,517 - ERROR - mycodo.controllers.controller_pid_f72bde02 - Exception executing check_pid() on attempt 1 of 3. Waiting 10 seconds and trying again. Traceback (most recent call last): File "/var/mycodo-root/mycodo/controllers/base_controller.py", line 124, in attempt_execute func() File "/var/mycodo-root/mycodo/controllers/controller_pid.py", line 316, in check_pid duration_sec=self.setpoint_tracking_max_age) File "/var/mycodo-root/mycodo/utils/influx.py", line 468, in read_last_influxdb measure=measure, duration_sec=duration_sec, value='LAST') File "/var/mycodo-root/mycodo/utils/influx.py", line 440, in read_influxdb_single

On 6/17/2020 8:41 PM, Kyle Gabriel wrote:

If you didn't install pigpiod from Mycodo, it doesn't know it's installed, since Mycodo handles setting the sample rate. Go ahead and let Mycodo install pigpio, as this will fulfill the dependency and shouldn't pose an issue for anything else using pigpiod.

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[kizniche]

I was just informed about a bug with the pigpiod install within Mycodo (#783), so currently it is broken. I am working on getting this released, but I'm right in the middle of a big code change with the Output and PID system.

I'll look into your PID errors.

[infinisean]

Understood. No worries.

Thanks for the quick reply.

Let me know if I can help at all with testing or whatever.

On 7/7/2020 12:26 AM, Kyle Gabriel wrote:

I was just informed about a bug with the pigpiod install within Mycodo (#783 https://github.com/kizniche/Mycodo/issues/783), so currently it is broken. I am working on getting this released, but I'm right in the middle of a big code change with the Output and PID system.

I'll look into your PID errors.

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[kizniche]

I just released v8.5.7, a bugfix release that fixes the pigpio install issue.

[infinisean]

Is that the cause of the pid issue as well?

On 7/7/2020 2:48 PM, Kyle Gabriel wrote:

I just released v8.5.7, a bugfix release that fixes the pigpio install issue.

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[kizniche]

I actually just released v8.5.8 that really fixes the pigpio install issue. I haven't yet looking into your PID issue.

[kizniche]

I just released v8.6.0, which fixes even more pigpiod issues I found recently. After upgrade, I'd recommend going to Configure -> Raspberry Pi and uninstalling pigpio and reinstalling it, from the web interface.