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View Code? Open in Web Editor NEWPython library for the Enviro+ environmental monitoring board
Home Page: https://shop.pimoroni.com/products/enviro-plus
License: MIT License
Python library for the Enviro+ environmental monitoring board
Home Page: https://shop.pimoroni.com/products/enviro-plus
License: MIT License
get_noise_profile() always returns the same value for amp_total.
amp_total = (low + mid + high) / 3.0
low, mid, high are parameters. Shouldn't that be
amp_total = (amp_low + amp_mid + amp_high) / 3.0
?
Clean Raspbian Lite install, one line installer for dependencies, clone this repo to directory, navigate to repo and call "python weather-and-lite.py' on a raspberry pi zero causes the following error
File "weather-and-light.py", line 380
SyntaxError: Non-ASCII character '\xc2' in file weather-and-light.py on line 380, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details
Adding
# -*- coding: utf-8 -*-
to the file removes this issue, but then you get the following error:
File "weather-and-light.py", line 381
temp_string = f"{corr_temperature:.0f}°C"
^
SyntaxError: invalid syntax
Removing the °C
still causes this error
It be nice for me at least to see all the readings.
So I add a rotate_mode like proximity.
Anything > 0 enables it, default is 10 seconds for me.
diff --git a/examples/all-in-one-no-pm.py b/examples/all-in-one-no-pm.py
index 6bb6873..100cf9e 100755
--- a/examples/all-in-one-no-pm.py
+++ b/examples/all-in-one-no-pm.py
@@ -101,6 +101,7 @@ factor = 0.8
cpu_temps = [get_cpu_temperature()] * 5
delay = 0.5 # Debounce the proximity tap
+rotate_mode = 10 # seconds between screen mode rotate
mode = 0 # The starting mode
last_page = 0
light = 1
@@ -130,6 +131,12 @@ try:
mode %= len(variables)
last_page = time.time()
+ # If time elapsed > rotate_mode, show next mode
+ if rotate_mode > 0 and time.time() - last_page > rotate_mode:
+ mode += 1
+ mode %= len(variables)
+ last_page = time.time()
+
# One mode for each variable
if mode == 0:
# variable = "temperature"
Hi,
I'm following the getting started instructions here
Can you advise?
Hey there, I really appreciate the work that's gone into the Enviro+ and the library, it's a nifty piece of kit!
I'm having a bit of trouble at the moment translating the readings from the MICS sensor into something meaningful beyond increasing or decreasing air quality relative to the environment it started measuring in.
Are there are any reference materials for translating the Ohms output by each of the sensors to some bands for measuring air quality? For example, if the Oxidising output was 4570 Ohms, what does that mean in itself? Is that normal levels? Dangerous levels? Or does it not intrinsically mean anything?
If the latter, am I right in thinking that to measure the air quality of a particular area, I first need to start the sensor in a "clean" room to set the baseline?
Any guidance is much appreciated!
the setup guide is missing alot of needed installs. For example. I have had to install
Is there not a consolidated script that can install this for semi-beginners like myself.
Total newbie suggestion. I am no Pythong programmer.
Why not map the raw values in KOhms from the gas sensor to the value range shown in the data sheet for the MiCS-6814?
For example:
from numpy import interp
# Nitrogen dioxide
oxidised_data = interp(oxidised_data,[0.8,20],[0.05,10])
# Carbon monoxide
reduced_data = interp(reduced_data,[100,1500],[1,1000])
# Amonia.
nh3_data = interp(nh3_data,[10,1500],[1,300])
This code does not take into sensitivity factor which varies over the range.
and this 6291552 value is constant every single time
the python process hangs at random times too
2019-08-07 04:07:04.255 INFO temp: 16.9 C
2019-08-08 06:27:57.758 INFO temp: 17.6 C
2019-08-10 15:33:00.070 INFO temp: 26.6 C
2019-08-11 22:16:45.719 INFO temp: 21.5 C
2019-08-12 06:08:43.521 INFO temp: 20.7 C
2019-08-13 03:26:02.298 INFO temp: 19.0 C
2019-08-14 16:07:36.694 INFO temp: 25.9 C
2019-08-15 04:02:06.605 INFO temp: 17.3 C
2019-08-16 03:15:17.037 INFO temp: 22.4 C
2019-08-17 17:53:19.751 INFO temp: 26.6 C
anybody seen anything like it?
it must be an issue coming from ltr559, as the whole python process is hosed after that
I got a Google Coral Dev mini board with the same pinout as a raspberry pi0 with I2C support
https://coral.ai/docs/dev-board-mini/get-started/
What changes are needed to get the enviro+ python library working on a non-raspberry pi board?
Is there any standardised way of calibrating the sensors provided with the Enviro+ or can a simple linear correction be applied in python to some of these?
The following readings seem to be off (I don't have comparables for the others):
How are other's handling this issue?
from fonts.ttf import RobotMedium as UserFont
is in combined.py, but fonts.ttf is not installed by this package.
I received my enviro+ last week and over the weekend I managed to install the examples and build my own InfluxDB bridge to show all those measurements via Grafana. Had a lot of tinkering fun, thanks :)
But I'm missing a way to interface the MEMS microphone to read out noise levels. I suppose that support is under way, can someone give an ETA or directions where to read further.
In the display_everything() function -
xrange is deprecated in python 3
also there is a creep in the x position of each successive text element so they display in a stepped line going off the right side of the screen. The y positions are fine, just the x positions are wrong.
I fixed as follows -
A: changed both xrange() statements to range()
B: changed end of x= statement from (i / row_count)) to (i % column_count))
# Displays all the text on the 0.96" LCD
def display_everything():
draw.rectangle((0, 0, WIDTH, HEIGHT), (0, 0, 0))
column_count = 2
row_count = (len(variables)/column_count)
for i in range(len(variables)):
variable = variables[i]
data_value = values[variable][-1]
unit = units[i]
x = x_offset + ((WIDTH/column_count) * (i % column_count))
y = y_offset + ((HEIGHT/row_count) * (i % row_count))
message = "{}: {:.1f} {}".format(variable[:4], data_value, unit)
lim = limits[i]
rgb = palette[0]
for j in range(len(lim)):
if data_value > lim[j]:
rgb = palette[j+1]
draw.text((x, y), message, font=smallfont, fill=rgb)
st7735.display(img)
$ python3 enviroplus-python/examples/all-in-one.py
Displays readings from all of Enviro plus' sensors
Press Ctrl+C to exit!
Traceback (most recent call last):
File "enviroplus-python/examples/all-in-one.py", line 143, in
cpu_temp = get_cpu_temperature()
File "enviroplus-python/examples/all-in-one.py", line 96, in get_cpu_temperature
return float(output[output.index('=') + 1:output.rindex("'")])
TypeError: argument should be integer or bytes-like object, not 'str'
I've tinkered with the weather.py code to create my own routine. I've noticed that when you read data from the sensors just once you get a different measurement to what you get if you loop through the process a few times as it seems to correct itself after the second reading. So I've set it to loop ten times, and then write the tenth set of readings to a CSV file.
If I run the routine at the terminal prompt (python /home/pi/enviro.py) it writes accurate readings to the CSV. However, I've set up a cron job to run it every 30 minutes, and always the readings it outputs are exactly the same, without even a millionth of a degree difference between each running:
Temperature: 22.54967373898835
Pressure: 676.4017617518247
Humidity: 89.2103699647858
Can anybody show me what I'm doing wrong?
#!/usr/bin/env python3
import time
from bme280 import BME280
try:
from smbus2 import SMBus
except ImportError:
from smbus import SMBus
import logging
logging.basicConfig(
format='%(asctime)s.%(msecs)03d %(levelname)-8s %(message)s',
level=logging.INFO,
datefmt='%Y-%m-%d %H:%M:%S')
logging.info("""Print readings from the BME280 weather sensor.
""")
bus = SMBus(1)
bme280 = BME280(i2c_dev=bus)
from datetime import datetime
now = datetime.now()
thedate = now.strftime("%Y-%m-%d")
thetime = now.strftime("%H:%M:%S")
counter = 0
while counter < 10:
temperature = bme280.get_temperature()
pressure = bme280.get_pressure()
humidity = bme280.get_humidity()
logging.info("""Temperature: {:05.2f} *C
Pressure: {:05.2f} hPa
Relative humidity: {:05.2f} %
""".format(temperature, pressure, humidity))
counter = counter + 1
import csv
csvRow = [thedate, thetime, temperature, pressure, humidity]
csvfile = "/home/pi/lounge.csv"
with open(csvfile, "a") as fp:
wr = csv.writer(fp, dialect='excel')
wr.writerow(csvRow)
The install fails because it can't find a package named 'ffi'. For both Python 2 and 3.
This is fixed by running:
sudo apt-get install python3-cffi python-cffi
And restarting the install.
I can see a few improvements to luftdaten.py
which may be worth incorporating:
update_time = time.time()
to before send_to_luftdaten
so the data sending function has the full 145??? seconds to retry sending the values. Though I can't see any fearture for sending a timestamp to luftdaten.enviroplus-python/examples/all-in-one-no-pm.py
Lines 22 to 31 in 7452b88
Need to ensure instructions aren't broken: https://learn.pimoroni.com/tutorial/sandyj/enviro-plus-and-luftdaten-air-quality-station
Should probably attempt to log to /tmp/luftdaten.log
since the instructions linked above do not pipe error output anywhere useful.
Additionally it might be worth authoring a systemd unit for running and maintaining the script.
I'm trying to converted a bit of c++ code which uses a MiCS6814 to estimate the ppm of the detectable gasses but I'm not sure how to get the equivalent enviroplus-python values for resistance & base resistance with in the getCurrentRatio function which is then used with in the measure function. Could anyone give me any pointers please?
so ... this seems a bit odd. i have a script that runs just fine from the terminal but it gives this error when it is started up with @reboot
in crontab.
Traceback (most recent call last):
File "/home/pi/AIY-projects-python/enviroplus-python/examples/particles-lcd.py", line 48, in <module>
readings = pms5003.read()
File "build/bdist.linux-armv7l/egg/pms5003/__init__.py", line 121, in read
pms5003.ReadTimeoutError: PMS5003 Read Timeout
any suggestions what would be wise here? i am trying to make my raspberry log useful info to the screen such that when i leave it in a room with power plugged in it will show metrics without the need for the raspberry to be plugged into a screen.
Working with Raspberry Lite
enviroplus 0.0.1 Python Library: Installer
Installing for Python 2..
Checking for python-numpy
Checking for python-smbus
Checking for python-pil
Traceback (most recent call last):
File "setup.py", line 25, in <module>
from setuptools import setup
ImportError: No module named setuptools
Installing for Python 3..
Checking for python3-numpy
Checking for python3-smbus
Checking for python3-pil
Traceback (most recent call last):
File "setup.py", line 25, in <module>
from setuptools import setup
ModuleNotFoundError: No module named 'setuptools'
Setting up i2c and SPI..
Backing up /boot/config.txt to /boot/config.preinstall-enviroplus-2019-04-04-07-04-05.txt
Setting up serial for PMS5003..
Adding dtoverlay=pi3-miniuart-bt # for Enviro+ to /boot/config.txt
Done!
Ill send in a PR to add python-setuptools
I have a problem with the enviro (+) library with an enviro card. When I launch weather.py I get these messages:
Traceback (most recent call last):
File "/home/pi/enviroplus-python/examples/weather.py", line 4, in
from bme280 import BME280
File "/usr/local/lib/python3.7/dist-packages/pimoroni_bme280-0.0.2-py3.7.egg/bme280/init.py", line 2, in
from i2cdevice import Device, Register, BitField, _int_to_bytes
ModuleNotFoundError: No module named 'i2cdevice'
I did ; pip install i2cdevice and bme280, but always the same,
HI,
I've executed luftdaten.py script in order to get my sensor ID for luftdaten registration page. The thing is, after that, there is no way to get others scripts working on lcd screen.
I've made a reboot, a hard reset and even uninstalled all data... nothing.
Anyone has experienced this?
Hello, It would be really cool to have plotters-combined.py ported to the PIL library:
https://github.com/pimoroni/EnviroPlus-FeatherWing/blob/master/examples/plotters-combined.py
Could it be an additional future feature?
Could anyone help me with this? I tried to add a csv writer to the all-in-one script so that each row indicated the variables taken at each interval. However I couldnt get this to work properly. Does anyone have anything similar they could share? Thanks
When will this be possible? The current adc example only reads ref/gnd and the library has no access to the 4th input. I am looking to use my analog co2 sensor with this.
Hi there
Just a question: the example shown on the store page for Enviro, the one with icons and sensor values with the orange backgroufnd. Where can i find it?
Thanks
Hi,
after I have installed the enviro+ and update/upgrade my pi zero W i tried the example of lcd.py and the only thing that happens is that the backlight is on but no "Hello" message!
How can i solve this, it seems that all the connections are fine since i do get measurements when executing other example files.
I've found that the dt = pytz.timezone(time_zone).localize(dt) in line 90 appears to always return the datetime based on the Raspberry Pi's timezone setting , rather than the timezone provided to pytz. This issue is highlighted here https://www.journaldev.com/23370/python-pytz
This is only an issue if the timezone provided to pytz differs from the Raspberry Pi's timezone setting. In may case, I want to be able to deploy systems in multiple time zones without needing to change the Raspberry Pi's timezone setting.
I addressed it by using astimezone to convert to the desired timezone via UTC as follows:
utc = pytz.utc
utc_dt = datetime.now(tz=utc)
local_dt = utc_dt.astimezone(pytz.timezone(time_zone))
today = local_dt.date()
I then used local_dt in the remainder of sun_moon_time() and also returned that value so that the local time is displayed, rather than the Raspberry Pi's system time.
Let me know if you agree that this is an issue. If so, I'm happy to raise a PR.
Hi,
I have some dubts about values I am getting with PMS5003 sensor.
I am getting very hight values (almoust the double) from the expected.
Is there a way to verify if the sensor is working properly?
The data I am getting are to hi to be very credible.
Is there in general a way to verify data from PMS5003 and BME280?
Thank you!
The current output erroneously gives the impression that the first 3 values are the actual amount of particles read by the sensor with the names like combustion particles, organic compounds, metals.
Those values are actually the standard value, which is a calculation off the concentration "corrected" to the "standard atmosphere", and not the real values of the sensor.
https://www.aqmd.gov/docs/default-source/aq-spec/resources-page/plantower-pms5003-manual_v2-3.pdf
PM1.0 ug/m3 (ultrafine particles): 88
PM2.5 ug/m3 (combustion particles, organic compounds, metals): 129
PM10 ug/m3 (dust, pollen, mould spores): 148
PM1.0 ug/m3 (atmos env): 58
PM2.5 ug/m3 (atmos env): 85
PM10 ug/m3 (atmos env): 98
There is more info here:
https://publiclab.org/questions/samr/04-07-2019/how-to-interpret-pms5003-sensor-values#c23772
At least for me, this is how different this values are comparing to other similar devices side by side reporting in "under atmospheric environment" :
https://imgur.com/a/NbRluZU
With the regular white Enviro (not with air monitoring), I needed to install one more dependency to get the noise-profile.py working. Possibly this should be done when enviro is setup the first time.
python3 -m pip install sounddevice
It would be great if you could control the brightness of the TFT screen. Right now even when you make the color red, its very bright in a dark room. It would be great if it supported some level of PWM to darken the screen up.
right after a clean install on rpi3
(env) pi@raspberrypi:~/AIY-projects-python/enviroplus-python/examples $ python compensated-temperature.py
compensated-temperature.py - Use the CPU temperature
to compensate temperature readings from the BME280 sensor.
Method adapted from Initial State's Enviro pHAT review:
https://medium.com/@InitialState/tutorial-review-enviro-phat-for-raspberry-pi-4cd6d8c63441
Press Ctrl+C to exit!
Traceback (most recent call last):
File "compensated-temperature.py", line 39, in <module>
cpu_temp = get_cpu_temperature()
File "compensated-temperature.py", line 29, in get_cpu_temperature
return float(output[output.index('=') + 1:output.rindex("'")])
TypeError: a bytes-like object is required, not 'str
Hi,
I am having issues with the humidity reading of the BME280 sensor. Here we have around 80% of relative humidity, however, the maximum value I get with the all-in-one-no-pm.py is 36-40% HR.
I have looked at the BME280 datasheets and it can read from 0-100% HR, so in theory, an 80% HR is achievable.
Any idea or suggestion is welcomed.
unfortunately there is a new error. when running this from ipython:
In [12]: %run all-in-one.py
all-in-one.py - Displays readings from all of Enviro plus' sensors
Press Ctrl+C to exit!
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
~/AIY-projects-python/enviroplus-python/examples/all-in-one.py in <module>
133 variable = "temperature"
134 unit = "C"
--> 135 cpu_temp = get_cpu_temperature()
136 # Smooth out with some averaging to decrease jitter
137 cpu_temps = cpu_temps[1:] + [cpu_temp]
~/AIY-projects-python/enviroplus-python/examples/all-in-one.py in get_cpu_temperature()
87 process = Popen(['vcgencmd', 'measure_temp'], stdout=PIPE)
88 output, _error = process.communicate()
---> 89 return float(output[output.index('=') + 1:output.rindex("'")])
90
91
TypeError: a bytes-like object is required, not 'str'
Hi,
I keep getting timeouts with the pms5003 particle sensor library
In [5]: readings = pms5003.read()
---------------------------------------------------------------------------
ReadTimeoutError Traceback (most recent call last)
<ipython-input-5-dc7f60780eda> in <module>
----> 1 readings = pms5003.read()
/usr/local/lib/python3.7/dist-packages/pms5003-0.0.2-py3.7.egg/pms5003/__init__.py in read(self)
119 elapsed = time.time() - start
120 if elapsed > 5:
--> 121 raise ReadTimeoutError("PMS5003 Read Timeout")
122
123 sof = bytearray(self._serial.read(2))
ReadTimeoutError: PMS5003 Read Timeout
It times out every time. I have not gotten a reading from it yet. What are some things I can do to debug? I can hear the fan spinning on the pms5003 sensor, so it appears to be on.
It appears that the first value in each example is always incorrect. Why is that?
root@zero:/home/pi/enviroplus-python/examples# ./temperature.py
21.6270364913
30.9992406745
30.9919257087
30.9839746596
30.9776138208
30.9737973178
30.9702988568
30.9661643122
root@zero:/home/pi/enviroplus-python/examples# ./gas.py
gas.py - Print readings from the MICS6814 Gas sensor.
Oxidising: 72333.33 Ohms
Reducing: 21289.84 Ohms
NH3: 10811.28 Ohms
Oxidising: 617.65 Ohms
Reducing: 37759.51 Ohms
NH3: 461.96 Ohms
Oxidising: 565.66 Ohms
Reducing: 85284.40 Ohms
NH3: 721.92 Ohms
Oxidising: 513.76 Ohms
Reducing: 113696.97 Ohms
NH3: 1037.04 Ohms
Oxidising: 513.76 Ohms
Reducing: 135304.35 Ohms
NH3: 1409.13 Ohms
Oxidising: 565.66 Ohms
Reducing: 152108.11 Ohms
NH3: 1731.96 Ohms```
```console
root@zero:/home/pi/enviroplus-python/examples# ./light.py
light.py - Print readings from the LTR559 Light & Proximity sensor.
Light: 00.00 Lux
Proximity: 00.00
Light: 07.97 Lux
Proximity: 00.00
Light: 07.97 Lux
Proximity: 00.00
Light: 07.97 Lux
Proximity: 00.00```
While following the getting started guide but ran into problems while testing the LCD.
I get this error
pi@raspberrypi:~/enviroplus-python/examples $ python lcd.py
Traceback (most recent call last):
File "lcd.py", line 3, in <module>
import ST7735
File "/usr/local/lib/python2.7/dist-packages/ST7735-0.0.3-py2.7.egg/ST7735/__init__.py", line 25, in <module>
import spidev
ImportError: No module named spidev
pi@raspberrypi:~/enviroplus-python/examples $
the same for all-in-one.py
pi@raspberrypi:~/enviroplus-python/examples $ python all-in-one.py
Traceback (most recent call last):
File "all-in-one.py", line 7, in <module>
import ST7735
File "/usr/local/lib/python2.7/dist-packages/ST7735-0.0.3-py2.7.egg/ST7735/__init__.py", line 25, in <module>
import spidev
ImportError: No module named spidev
pi@raspberrypi:~/enviroplus-python/examples $
installed python version is 2.7.16
pi@raspberrypi:~/enviroplus-python/examples $ python
Python 2.7.16 (default, Apr 6 2019, 01:42:57)
[GCC 8.2.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>
[1]+ Stopped python
pi@raspberrypi:~/enviroplus-python/examples $
What can be the problem?
After a while, the script will fail with the following printed in the Terminal:
(22, 'Invalid argument')
And when I press Ctrl + C I get the following stack trace:
File "./luftdaten.py", line 177, in <module>
values = read_values()
File "./luftdaten.py", line 62, in read_values
pm_values = pms5003.read()
File "/usr/local/lib/python2.7/dist-packages/pms5003-0.0.4-py2.7.egg/pms5003/__init__.py", line 123, in read
sof = bytearray(self._serial.read(2))
File "/usr/local/lib/python2.7/dist-packages/pyserial-3.4-py2.7.egg/serial/serialposix.py", line 480, in read
timeout = Timeout(self._timeout)
File "/usr/local/lib/python2.7/dist-packages/pyserial-3.4-py2.7.egg/serial/serialutil.py", line 123, in __init__
def __init__(self, duration):
KeyboardInterrupt
But I can't see why it's failing. Does anyone know the exception to catch in this case?
Just out of curiosity - why does it compensate relative to the GPU temperature returned from the video core library instead of reading the CPU temperature? The two are pretty similar, but the latter is easier to get at.
You can directly read the CPU core temperature from /sys/class/thermal/thermal_zone0/temp and not run the vcgencmd sub process.
Getting a lot of the following errors. Anyone else encountered this before?
read failed: device reports readiness to read but returned no data (device disconnected or multiple access on port?)
Perhaps because serial port is trying to be accessed by another process or should be disalbed at boot? I'm presently trying to integrate with BaleanOS for easier device deployments. Perhaps a config.txt boot setting could cause this?
Hello,
I have both an Enviro (for inside) and an Enviro+ (for outside).
I am writing code to collect data from them. The same code will run on each device, with the only difference being that the Enviro+ also collects data from the gas sensor.
At the moment, I am using this rather nasty bit of code to detect if the gas sensor is available:
try:
gas.read_all()
hasGasSensor = True
except Exception:
hasGasSensor = False
This works, however I am worried about what kind of exceptions might be thrown during read_all
. Without the try/except, I get "OSError: [Errno 121] Remote I/O error" from the i2c code. I only hope that code is properly cleaning up after it fails to connect to the sensor, or that it doesn't modify anything.
It would be nice if the library provided a cleaner way to detect if the sensor is available. Something like an is_available
method, which detects if the sensor is available/active before attempting to do anything with it.
I could be wrong, and my try/except method above is perfectly fine. But if that is the case then the library could just use that as the implementation of is_available
.
Can anyone offer a suggestion on how to change the values to F?
Thanks.
Hi - its entirely possible the problem is with me, as I am not that familiar with Linux or Python, however - I installed Stretch Lite on my Pi0WH, and have installed python and python3, along with pip (and pip3) and git.
When I run "sudo ,/install.sh", the install script runs, but I get a warning flash up (twice, once for python2 and once for python3):
Installing for Python 2..
/usr/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'project_urls'
warnings.warn(msg)
and
Installing for Python 3..
/usr/lib/python3.5/distutils/dist.py:261: UserWarning: Unknown distribution option: 'project_urls'
warnings.warn(msg)
There doesn't appear to be any other errors. Having looked online, it was suggested that the setuptools app was out of date, and to run "pip install setuptools --upgrade" which I did, and it installed version 41 if I recall.
Re-run the installer but the errors remain.
I tried carrying on regardless, and when I try and run "python luftdaten.py" the I get:
Traceback (most recent call last):
File "luftdaten.py", line 3, in
import requests
ImportError: No module named requests
Nothing is showing on the Enviro+ display either.
Hope I have provided enough information!
Hi
I am really happy using my Enviro + and PMS5003 with Luftdaten but I was wondering if there is a way to put the display to sleep after a few minutes. The information being displayed (ID and Wifi status) is useful for the initial configuration but not after that.
I would love to learn more about this and how to edit the Luftdaten code to make this happen.
Thank you!
I'm not sure how to troubleshoot this one further but I'm noticing the luftdaten.py script stops syncing with the https://luftdaten.info site after running continuously for 3 or more days straight. Only a restart of the script appears to resolve the issue. Please advise on how to diagnose further.
Needs a comment to explain that the mics6812 forms a volage divider with a 56k Ohm resistor, and that the calculation is determining the resistance of mics6812.
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