MCP2221 + PM25 Circuit Python Not Running Moderators: adafruit_support_bill, adafruit

[scotch1]

Following this tutorial to read the PM2.5 AQ sensor to Python thru MCP2221: https://learn.adafruit.com/pmsa003i/python-circuitpython

Installed Library following setup of MCP2221 to working with Blinka: [url]pip3 install adafruit-circuitpython-pm25[/url]

Have Python 3.7.4 and thought I installed it: see list [img]

Adafruit_list_PM25.JPG

[/img]

Plugged in and added the RST to GPIO 0, error ensured: Why?

Code Error:

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  File "A_Sensor_PM25_AQ_R0.py", line 10, in <module>
    from adafruit_pm25.i2c import PM25_I2C
ModuleNotFoundError: No module named 'adafruit_pm25.i2c'; 'adafruit_pm25' is not a package

Adapted for windows with COM4 port:

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# pylint: disable=unused-import
import time
import board
import busio
from digitalio import DigitalInOut, Direction, Pull
from adafruit_pm25.i2c import PM25_I2C


reset_pin = None
# If you have a GPIO, its not a bad idea to connect it to the RESET pin
reset_pin = DigitalInOut(board.G0)
reset_pin.direction = Direction.OUTPUT
reset_pin.value = False


# For use with a computer running Windows:
import serial
uart = serial.Serial("COM4", baudrate=9600, timeout=1)

# For use with microcontroller board:
# (Connect the sensor TX pin to the board/computer RX pin)
# uart = busio.UART(board.TX, board.RX, baudrate=9600)

# For use with Raspberry Pi/Linux:
# import serial
# uart = serial.Serial("/dev/ttyS0", baudrate=9600, timeout=0.25)

# For use with USB-to-serial cable:
# import serial
# uart = serial.Serial("/dev/ttyUSB0", baudrate=9600, timeout=0.25)

# Connect to a PM2.5 sensor over UART
# from adafruit_pm25.uart import PM25_UART
# pm25 = PM25_UART(uart, reset_pin)

# Create library object, use 'slow' 100KHz frequency!
i2c = busio.I2C(board.SCL, board.SDA, frequency=100000)
# Connect to a PM2.5 sensor over I2C
pm25 = PM25_I2C(i2c, reset_pin)

print("Found PM2.5 sensor, reading data...")

while True:
    time.sleep(1)

    try:
        aqdata = pm25.read()
        # print(aqdata)
    except RuntimeError:
        print("Unable to read from sensor, retrying...")
        continue

    print()
    print("Concentration Units (standard)")
    print("---------------------------------------")
    print(
        "PM 1.0: %d\tPM2.5: %d\tPM10: %d"
        % (aqdata["pm10 standard"], aqdata["pm25 standard"], aqdata["pm100 standard"])
    )
    print("Concentration Units (environmental)")
    print("---------------------------------------")
    print(
        "PM 1.0: %d\tPM2.5: %d\tPM10: %d"
        % (aqdata["pm10 env"], aqdata["pm25 env"], aqdata["pm100 env"])
    )
    print("---------------------------------------")
    print("Particles > 0.3um / 0.1L air:", aqdata["particles 03um"])
    print("Particles > 0.5um / 0.1L air:", aqdata["particles 05um"])
    print("Particles > 1.0um / 0.1L air:", aqdata["particles 10um"])
    print("Particles > 2.5um / 0.1L air:", aqdata["particles 25um"])
    print("Particles > 5.0um / 0.1L air:", aqdata["particles 50um"])
    print("Particles > 10 um / 0.1L air:", aqdata["particles 100um"])
    print("---------------------------------------")

[adafruit_support_carter]

Something with your Python setup is not finding the module. Do you get the same thing if you try a simple import from a Python REPL prompt?

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import adafruit_pm25


[scotch1]

Got further except the call for the "PM25_I2C", tried subbing with "adafruit_pm25" and keeping removing the "

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from adafruit_pm25.i2c import PM25_I2C

"

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Traceback (most recent call last):
  File "A_Sensor_PM25_AQ_R0.py", line 47, in <module>
    pm25 = PM25_I2C(i2c, reset_pin)
NameError: name 'PM25_I2C' is not defined

Code:

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# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT
 
"""
Example sketch to connect to PM2.5 sensor with either I2C or UART.
"""
 
# pylint: disable=unused-import
import time
import board
import busio
from digitalio import DigitalInOut, Direction, Pull
import adafruit_pm25
#from adafruit_pm25.i2c import PM25_I2C
 
 
reset_pin = None
# If you have a GPIO, its not a bad idea to connect it to the RESET pin
# reset_pin = DigitalInOut(board.G0)
# reset_pin.direction = Direction.OUTPUT
# reset_pin.value = False
 
 
# For use with a computer running Windows:
import serial
uart = serial.Serial("COM4", baudrate=9600, timeout=1)
 
# For use with microcontroller board:
# (Connect the sensor TX pin to the board/computer RX pin)
#uart = busio.UART(board.TX, board.RX, baudrate=9600)
 
# For use with Raspberry Pi/Linux:
# import serial
# uart = serial.Serial("/dev/ttyS0", baudrate=9600, timeout=0.25)
 
# For use with USB-to-serial cable:
# import serial
# uart = serial.Serial("/dev/ttyUSB0", baudrate=9600, timeout=0.25)
 
# Connect to a PM2.5 sensor over UART
# from adafruit_pm25.uart import PM25_UART
# pm25 = PM25_UART(uart, reset_pin)
 
# Create library object, use 'slow' 100KHz frequency!
i2c = busio.I2C(board.SCL, board.SDA, frequency=100000)
# Connect to a PM2.5 sensor over I2C
pm25 = PM25_I2C(i2c, reset_pin)
 
print("Found PM2.5 sensor, reading data...")
 
while True:
    time.sleep(1)
 
    try:
        aqdata = pm25.read()
        # print(aqdata)
    except RuntimeError:
        print("Unable to read from sensor, retrying...")
        continue
 
    print()
    print("Concentration Units (standard)")
    print("---------------------------------------")
    print(
        "PM 1.0: %d\tPM2.5: %d\tPM10: %d"
        % (aqdata["pm10 standard"], aqdata["pm25 standard"], aqdata["pm100 standard"])
    )
    print("Concentration Units (environmental)")
    print("---------------------------------------")
    print(
        "PM 1.0: %d\tPM2.5: %d\tPM10: %d"
        % (aqdata["pm10 env"], aqdata["pm25 env"], aqdata["pm100 env"])
    )
    print("---------------------------------------")
    print("Particles > 0.3um / 0.1L air:", aqdata["particles 03um"])
    print("Particles > 0.5um / 0.1L air:", aqdata["particles 05um"])
    print("Particles > 1.0um / 0.1L air:", aqdata["particles 10um"])
    print("Particles > 2.5um / 0.1L air:", aqdata["particles 25um"])
    print("Particles > 5.0um / 0.1L air:", aqdata["particles 50um"])
    print("Particles > 10 um / 0.1L air:", aqdata["particles 100um"])
    print("---------------------------------------")

[scotch1]

ALso: to show I installed it:

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(base) D:\Michael_Master\Engineering\Python_Coding\029_Serial_MP_USB_C>pip install adafruit-circuitpython-pm25
Requirement already satisfied: adafruit-circuitpython-pm25 in c:\programdata\anaconda3\lib\site-packages (1.0.3)
Requirement already satisfied: Adafruit-Blinka in c:\programdata\anaconda3\lib\site-packages (from adafruit-circuitpython-pm25) (5.7.0)
Requirement already satisfied: adafruit-circuitpython-busdevice in c:\programdata\anaconda3\lib\site-packages (from adafruit-circuitpython-pm25) (5.0.1)
Requirement already satisfied: Adafruit-PlatformDetect>=2.18.1 in c:\programdata\anaconda3\lib\site-packages (from Adafruit-Blinka->adafruit-circuitpython-pm25) (2.21.0)
Requirement already satisfied: pyftdi>=0.40.0 in c:\programdata\anaconda3\lib\site-packages (from Adafruit-Blinka->adafruit-circuitpython-pm25) (0.52.0)
Requirement already satisfied: Adafruit-PureIO>=1.1.7 in c:\programdata\anaconda3\lib\site-packages (from Adafruit-Blinka->adafruit-circuitpython-pm25) (1.1.7)
Requirement already satisfied: pyserial>=3.0 in c:\programdata\anaconda3\lib\site-packages (from pyftdi>=0.40.0->Adafruit-Blinka->adafruit-circuitpython-pm25) (3.4)
Requirement already satisfied: pyusb>=1.0.0 in c:\programdata\anaconda3\lib\site-packages (from pyftdi>=0.40.0->Adafruit-Blinka->adafruit-circuitpython-pm25) (

[adafruit_support_carter]

Looks like you are using an anaconda setup. Not sure if that matters, but does that require anything special for installing packages? Instead of just regular pip?

[scotch1]

Most of the time, not a problem, unless it has to be a specific environment.

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'pip3' is not recognized as an internal or external command,
operable program or batch file.

Python 3. All other adafruit items seem to be installing and working.

And it gets past the import library down to lines beyond the import, indicating it found the library, so it's something to do with the i2c library class call or pathing either in guthub or the install package, methinks with limited knowledge of the libraries :)

[adafruit_support_carter]

So it's not finding pip3 in your setup? Try running:

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pip --version


and see what it reports.

[scotch1]

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pip 19.2.3 from C:\ProgramData\Anaconda3\lib\site-packages\pip (python 3.7)

[scotch1]

So it's not finding pip3 in your setup? Try running:

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pip --version


and see what it reports.

normally I have to just use pip install xxxxx to get packages, not pip3.

[adafruit_support_carter]

Thanks. That seems to look OK. How about trying a forced re-install of the PM25 library and see if it can find it then?

[scotch1]

Thanks. That seems to look OK. How about trying a forced re-install of the PM25 library and see if it can find it then?

Were the directions there for that and do I have to figure out the python for removal of what's there?

[adafruit_support_carter]

Try:

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pip install --upgrade --force-reinstall adafruit-circuitpython-pm25


[scotch1]

Well, Well, that Worked (thanks)... but here's what's bizarre:
It works without the need to uncooment the windows lines for UART;
[img]

pm25_running.JPG

[/img]

or with it:
[img]

pm25_running2.JPG

[/img]

How come?

[adafruit_support_carter]

Are you using I2C in both cases maybe? Can't see those lines in the screen cap showing the uart setup.

[scotch1]

yeah: i2C running:
[img]

pm25_running3.JPG

[/img]