unreliably identifying the SPS30 sensor

[oylern]

When running the pms command, it seems to have trouble reliably identifying my SPS30 sensor. I can run it back to back a few times until the sensor is identified correctly and gives me readings. Here is example where it failed twice and worked the third time:

root@raspberrypi:/home/pi# pms -m SPS30 -n 3 -i 3 -s /dev/ttyAMA0 --debug serial -f csv
DEBUG:pms:capture 3 SPS30 obs from /dev/ttyAMA0 every 3 secs
DEBUG:pms:open /dev/ttyAMA0
DEBUG:pms:wake SPS30
DEBUG:pms:buffer length: 55
DEBUG:pms:message hex: 7e00004300bc7e7e0003002841204c59413a57fe4147f7e9414ab18542862e7d5e429d0205429fc71f42a04c1642a064f03f2b2c584c7e
DEBUG:pms:message hex: 7e0003002841204c59413a57fe4147f7e9414ab18542862e7d5e429d0205429fc71f42a04c1642a064f03f2b2c584c
ERROR:pms:Sensor is not SPS30
root@raspberrypi:/home/pi# pms -m SPS30 -n 3 -i 3 -s /dev/ttyAMA0 --debug serial -f csv
DEBUG:pms:capture 3 SPS30 obs from /dev/ttyAMA0 every 3 secs
DEBUG:pms:open /dev/ttyAMA0
DEBUG:pms:wake SPS30
DEBUG:pms:buffer length: 55
DEBUG:pms:message hex: 7e00004300bc7e7e000300284122a280413d479c414b47ec414e14c742887d3103429f438842a21ae142a2a35b42a2bcc83f2714e3b57e
DEBUG:pms:message hex: 7e000300284122a280413d479c414b47ec414e14c742887d3103429f438842a21ae142a2a35b42a2bcc83f2714e3b5
ERROR:pms:Sensor is not SPS30
root@raspberrypi:/home/pi# pms -m SPS30 -n 3 -i 3 -s /dev/ttyAMA0 --debug serial -f csv
DEBUG:pms:capture 3 SPS30 obs from /dev/ttyAMA0 every 3 secs
DEBUG:pms:open /dev/ttyAMA0
DEBUG:pms:wake SPS30
DEBUG:pms:buffer length: 54
DEBUG:pms:message hex: 7e00004300bc7e7e0003002841243d73413ef673414cf3b7414fbff94289782742a0dd0242a3b4df42a43d5d42a456dc3f23c6b63f7e
DEBUG:pms:message hex: 7e0003002841243d73413ef673414cf3b7414fbff94289782742a0dd0242a3b4df42a43d5d42a456dc3f23c6b63f7e
DEBUG:pms:message payload: (10.265002250671387, 11.935168266296387, 12.809500694274902, 12.984368324279785, 68.73467254638672, 80.43165588378906, 81.85326385498047, 82.1198501586914, 82.16964721679688, 0.6397508382797241)
DEBUG:pms:message hex: 7e00030000fc7e
DEBUG:pms:message header: b'~\x00\x03\x00\x00'
DEBUG:pms:message hex: 7e00030028411d271d41368ea94143cf3f414675c0428397334299f243429ca4c7429d2635429d3e703f26a0730f7e
DEBUG:pms:message payload: (9.822049140930176, 11.409829139709473, 12.238097190856934, 12.40374755859375, 65.7953109741211, 76.9731674194336, 78.32183074951172, 78.57462310791016, 78.6219482421875, 0.6508857607841492)
time, pm01, pm25, pm04, pm10, n0_5, n1_0, n2_5, n4_0, n10_0, diam
1630355654, 9.8, 11.4, 12.2, 12.4, 65.80, 76.97, 78.32, 78.57, 78.62, 0.7
DEBUG:pms:message hex: 7e00030028411a411e4132fe45413fd7694142693442813a33429722e84299c197429a3f3b429a56d23f26ef40507e
DEBUG:pms:message payload: (9.640897750854492, 11.187077522277832, 11.990090370178223, 12.150684356689453, 64.6136703491211, 75.56817626953125, 76.87810516357422, 77.12349700927734, 77.16957092285156, 0.6520881652832031)
1630355657, 9.6, 11.2, 12.0, 12.2, 64.61, 75.57, 76.88, 77.12, 77.17, 0.7
DEBUG:pms:message hex: 7e00030028411ab0ca41334971413fffe441428ac64281a95542979869429a3159429aadd5429ac5463f27ae40017e
DEBUG:pms:message payload: (9.668161392211914, 11.205430030822754, 11.99997329711914, 12.158880233764648, 64.83072662353516, 75.79767608642578, 77.09638214111328, 77.33951568603516, 77.38529968261719, 0.6550025939941406)
1630355660, 9.7, 11.2, 12.0, 12.2, 64.83, 75.80, 77.10, 77.34, 77.39, 0.7
DEBUG:pms:sleep SPS30
DEBUG:pms:close /dev/ttyAMA0

Here is another time it errored where the initial response from the sensor was much shorter:

root@raspberry:/home/pi# pms -m SPS30 -n 3 -i 3 -s /dev/ttyAMA0 --debug serial -f csv
DEBUG:pms:capture 3 SPS30 obs from /dev/ttyAMA0 every 3 secs
DEBUG:pms:open /dev/ttyAMA0
DEBUG:pms:wake SPS30
DEBUG:pms:buffer length: 14
DEBUG:pms:message hex: 7e00000000ff7e7e00030000fc7e
ERROR:pms:Sensor is not SPS30

I should be able to work around this by capturing the error and looping the command until I get some kind of expected results, but maybe the SPS30 has been updated and has some new identifiers? I do see the buffer length was 54 when it worked vs the 55 and 14 seen previously. No idea what might be going on.

Hardware: Raspberry Pi model B rev 2
OS: Raspbian GNU/Linux 10 (buster)
SPS30: attached to UART interface on pi (serial RX/TX, pins 8 and 10) and +5v and ground

[avaldebe]

Hi @oylern

Thanks for the bug report. It will take me some days to come up with a patch, but here is what I figured out from your debug output.

I do not have this sensor, so I wrote the module from the examples on the datasheet.
There are some short messages that represent "message received" and "no data", which I did not accounted for.
As far as I can tell, the relevant short messages are:

• 0x7E 0x00 0x00 0x00 0x00 0xFF 0x7E: normal response to start measurement command
• 0x7E 0x00 0x03 0x00 0xFC 0x7E: no data response to read measured values command
• 0x7E 0x00 0x00 0x43 0x00 0xBC 0x7E: command not allowed in current state error

which can be seen on the rejected messages.

[avaldebe]

@oylern

I think that the last commits should solve the problem.
Could you test this new version before I release it to pypi?
You should be able to install this tar file pypms-0.6.1.tar.gz on your RPi with

pip install pypms-0.6.1.tar.gz

[oylern]

Thanks for the super fast efforts on this!

I loaded this version on my system and it seems to be catching the new error messages, but also throwing other errors sometimes:

root@raspberrypi:/home/pi# pms -m SPS30 -n 1 -i 1 -s /dev/ttyAMA0 serial -f pm
Traceback (most recent call last):
  File "/usr/local/bin/pms", line 10, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.7/dist-packages/typer/main.py", line 214, in __call__
    return get_command(self)(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1137, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/typer/main.py", line 500, in wrapper
    return callback(**use_params)  # type: ignore
  File "/usr/local/lib/python3.7/dist-packages/pms/cli.py", line 84, in serial
    with reader:
  File "/usr/local/lib/python3.7/dist-packages/pms/core/reader.py", line 124, in __enter__
    if not self.sensor.check(buffer, "passive_mode"):  # pragma: no cover
  File "/usr/local/lib/python3.7/dist-packages/pms/core/sensor.py", line 81, in check
    self.Message.decode(buffer, self.command(command))
  File "/usr/local/lib/python3.7/dist-packages/pms/sensors/base.py", line 59, in decode
    return cls.unpack(message, header, length)[cls.data_records]  # type: ignore[call-overload]
  File "/usr/local/lib/python3.7/dist-packages/pms/sensors/sensirion/sps30.py", line 43, in unpack
    raise SensorWarmingUp("short message: no data")
pms.SensorWarmingUp: short message: no data
root@raspberrypi:/home/pi# pms -m SPS30 -n 1 -i 1 -s /dev/ttyAMA0 --debug serial -f pm
DEBUG:pms:capture 1 SPS30 obs from /dev/ttyAMA0 every 1 secs
DEBUG:pms:open /dev/ttyAMA0
DEBUG:pms:wake SPS30
DEBUG:pms:buffer length: 55
b"~\x00\x00C\x00\xbc~~\x00\x03\x00(@\xb0>\x98A\x16\xdf\x04AE\x8e\x97AN\xe4\xebA\xe8v\x8fB\x1e9\xe1B.\xe2\xe9B2'\x10B2\xa2\x18?n\xc6\x11\x8b~"
b"~\x00\x00C\x00\xbc~~\x00\x03\x00(@\xb0>\x98A\x16\xdf\x04AE\x8e\x97AN\xe4\xebA\xe8v\x8fB\x1e9\xe1B.\xe2\xe9B2'\x10B2\xa2\x18?n\xc6\x11\x8b~"
DEBUG:pms:message hex: 7e00004300bc7e7e0003002840b03e984116df0441458e97414ee4eb41e8768f421e39e1422ee2e9423227104232a2183f6ec6118b7e
b"~\x00\x03\x00(@\xb0>\x98A\x16\xdf\x04AE\x8e\x97AN\xe4\xebA\xe8v\x8fB\x1e9\xe1B.\xe2\xe9B2'\x10B2\xa2\x18?n\xc6\x11\x8b~"
DEBUG:pms:message hex: 7e0003002840b03e984116df0441458e97414ee4eb41e8768f421e39e1422ee2e9423227104232a2183f6ec6118b7e
DEBUG:pms:message payload: (5.507640838623047, 9.429447174072266, 12.347311973571777, 12.930888175964355, 29.057889938354492, 39.556522369384766, 43.72159194946289, 44.53814697265625, 44.658294677734375, 0.9327097535133362)
DEBUG:pms:short message: no data
b'~\x00\x03\x00(@\xae\x83$A\x15\x8a^AC\xe4\x03AM)$A\xe5\xfbLB\x1c\xa0-B-*>B0hXB0\xe2x?m\xacK\xab~'
b'~\x00\x03\x00(@\xae\x83$A\x15\x8a^AC\xe4\x03AM)$A\xe5\xfbLB\x1c\xa0-B-*>B0hXB0\xe2x?m\xacK\xab~'
DEBUG:pms:message hex: 7e0003002840ae832441158a5e4143e403414d292441e5fb4c421ca02d422d2a3e423068584230e2783f6dac4bab7e
DEBUG:pms:message payload: (5.453508377075195, 9.346281051635742, 12.24316692352295, 12.82254409790039, 28.747703552246094, 39.15642166137695, 43.29125213623047, 44.101898193359375, 44.221160888671875, 0.9284102320671082)
2021-08-31 07:38:22: PM1 5.5, PM2.5 9.3, PM4 12.2, PM10 12.8 μg/m3
DEBUG:pms:sleep SPS30
DEBUG:pms:close /dev/ttyAMA0
root@raspberrypi:/home/pi# pms -m SPS30 -n 1 -i 1 -s /dev/ttyAMA0 --debug serial -f pm
DEBUG:pms:capture 1 SPS30 obs from /dev/ttyAMA0 every 1 secs
DEBUG:pms:open /dev/ttyAMA0
DEBUG:pms:wake SPS30
DEBUG:pms:buffer length: 14
Traceback (most recent call last):
  File "/usr/local/bin/pms", line 10, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.7/dist-packages/typer/main.py", line 214, in __call__
    return get_command(self)(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1137, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/typer/main.py", line 500, in wrapper
    return callback(**use_params)  # type: ignore
  File "/usr/local/lib/python3.7/dist-packages/pms/cli.py", line 84, in serial
    with reader:
  File "/usr/local/lib/python3.7/dist-packages/pms/core/reader.py", line 124, in __enter__
    if not self.sensor.check(buffer, "passive_mode"):  # pragma: no cover
  File "/usr/local/lib/python3.7/dist-packages/pms/core/sensor.py", line 81, in check
    self.Message.decode(buffer, self.command(command))
  File "/usr/local/lib/python3.7/dist-packages/pms/sensors/base.py", line 59, in decode
    return cls.unpack(message, header, length)[cls.data_records]  # type: ignore[call-overload]
  File "/usr/local/lib/python3.7/dist-packages/pms/sensors/sensirion/sps30.py", line 43, in unpack
    raise SensorWarmingUp("short message: no data")
pms.SensorWarmingUp: short message: no data

[oylern]

Turned off debug again and got another interesting output:

root@raspberrypi:/home/pi# pms -m SPS30 -n 1 -i 1 -s /dev/ttyAMA0 serial -f pm
b'~\x00\x00C\x00\xbc~~\x00\x03\x00(@\xc5\x8a\x83A9tzA{\x04lA\x84\x10\x9bA\xefj\x8bB,{\x94BC\xc0\xdeBHS\tBH\xfd@?q\x95E\xc2~'
b'~\x00\x00C\x00\xbc~~\x00\x03\x00(@\xc5\x8a\x83A9tzA{\x04lA\x84\x10\x9bA\xefj\x8bB,{\x94BC\xc0\xdeBHS\tBH\xfd@?q\x95E\xc2~'
b'~\x00\x03\x00(@\xc5\x8a\x83A9tzA{\x04lA\x84\x10\x9bA\xefj\x8bB,{\x94BC\xc0\xdeBHS\tBH\xfd@?q\x95E\xc2~'
b'~\x00\x03\x00(@\xb3\x89\xdcA)\xcd]Aff[Ar\x84\xfbA\xd7\xfb\xe5B\x1cd\x83B1\xe4\xbcB6\x1e\nB6\xbb7?t\xb0\xde\xb3~'
b'~\x00\x03\x00(@\xb3\x89\xdcA)\xcd]Aff[Ar\x84\xfbA\xd7\xfb\xe5B\x1cd\x83B1\xe4\xbcB6\x1e\nB6\xbb7?t\xb0\xde\xb3~'
2021-08-31 08:59:07: PM1 5.6, PM2.5 10.6, PM4 14.4, PM10 15.2 μg/m3

[avaldebe]

Turned off debug again and got another interesting output:

root@raspberrypi:/home/pi# pms -m SPS30 -n 1 -i 1 -s /dev/ttyAMA0 serial -f pm
b'~\x00\x00C\x00\xbc~~\x00\x03\x00(@\xc5\x8a\x83A9tzA{\x04lA\x84\x10\x9bA\xefj\x8bB,{\x94BC\xc0\xdeBHS\tBH\xfd@?q\x95E\xc2~'
b'~\x00\x00C\x00\xbc~~\x00\x03\x00(@\xc5\x8a\x83A9tzA{\x04lA\x84\x10\x9bA\xefj\x8bB,{\x94BC\xc0\xdeBHS\tBH\xfd@?q\x95E\xc2~'
b'~\x00\x03\x00(@\xc5\x8a\x83A9tzA{\x04lA\x84\x10\x9bA\xefj\x8bB,{\x94BC\xc0\xdeBHS\tBH\xfd@?q\x95E\xc2~'
b'~\x00\x03\x00(@\xb3\x89\xdcA)\xcd]Aff[Ar\x84\xfbA\xd7\xfb\xe5B\x1cd\x83B1\xe4\xbcB6\x1e\nB6\xbb7?t\xb0\xde\xb3~'
b'~\x00\x03\x00(@\xb3\x89\xdcA)\xcd]Aff[Ar\x84\xfbA\xd7\xfb\xe5B\x1cd\x83B1\xe4\xbcB6\x1e\nB6\xbb7?t\xb0\xde\xb3~'
2021-08-31 08:59:07: PM1 5.6, PM2.5 10.6, PM4 14.4, PM10 15.2 μg/m3

sorry, I left some of the debug prints

[avaldebe]

I loaded this version on my system and it seems to be catching the new error messages, but also throwing other errors sometimes:
[...]

was not catching exceptions raised by the "short messages" on Sensor.check. I'll fix this and push a patch.

[avaldebe]

I loaded this version on my system and it seems to be catching the new error messages, but also throwing other errors sometimes:
[...]

was not catching exceptions raised by the "short messages" on Sensor.check. I'll fix this and push a patch.

you should be able install this version with straight from github with

pip install git+https://github.com/avaldebe/PyPMS.git@27dbe0f

[oylern]

Looks like that branch (or tag) was deleted? pip tried anyway and hit a dependency error. I eventually went back to the standard install command, which looks like it recognizes 0.6.1 is available, but same output:

root@raspberrypi:/home/pi# python3 -m pip install git+https://github.com/avaldebe/PyPMS.git@27dbe0f
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting git+https://github.com/avaldebe/PyPMS.git@27dbe0f
  Cloning https://github.com/avaldebe/PyPMS.git (to revision 27dbe0f) to /tmp/pip-req-build-rbdpmlaj
  Did not find branch or tag '27dbe0f', assuming revision or ref.
  Installing build dependencies ... done
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/usr/lib/python3.7/tokenize.py", line 447, in open
        buffer = _builtin_open(filename, 'rb')
    FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pip-req-build-rbdpmlaj/setup.py'
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-req-build-rbdpmlaj/
root@raspberrypi:/home/pi# pip3 install git+https://github.com/avaldebe/PyPMS.git
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting git+https://github.com/avaldebe/PyPMS.git
  Cloning https://github.com/avaldebe/PyPMS.git to /tmp/pip-req-build-o2p__fbo
  Installing build dependencies ... done
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/usr/lib/python3.7/tokenize.py", line 447, in open
        buffer = _builtin_open(filename, 'rb')
    FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pip-req-build-o2p__fbo/setup.py'
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-req-build-o2p__fbo/
root@raspberrypi:/home/pi# python3 -m pip install pypms
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Requirement already satisfied: pypms in /usr/local/lib/python3.7/dist-packages (0.6.1)
Requirement already satisfied: typing-extensions>=3.10; python_version >= "3.6" and python_version < "3.8" in /usr/local/lib/python3.7/dist-packages (from pypms) (3.10.0.2)
Requirement already satisfied: importlib-metadata>=3.6; python_version >= "3.6" and python_version < "3.10" in /usr/local/lib/python3.7/dist-packages (from pypms) (4.8.1)
Requirement already satisfied: pyserial>=3.0 in /usr/local/lib/python3.7/dist-packages (from pypms) (3.5)
Requirement already satisfied: typer>=0.3 in /usr/local/lib/python3.7/dist-packages (from pypms) (0.4.0)
Requirement already satisfied: zipp>=0.5 in /usr/local/lib/python3.7/dist-packages (from importlib-metadata>=3.6; python_version >= "3.6" and python_version < "3.10"->pypms) (3.5.0)
Requirement already satisfied: click<9.0.0,>=7.1.1 in /usr/local/lib/python3.7/dist-packages (from typer>=0.3->pypms) (8.0.1)
root@raspberrypi:/home/pi# pms -m SPS30 -n 1 -i 1 -s /dev/ttyAMA0 serial -f pm
Traceback (most recent call last):
  File "/usr/local/bin/pms", line 10, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.7/dist-packages/typer/main.py", line 214, in __call__
    return get_command(self)(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1137, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1062, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1668, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 1404, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.7/dist-packages/click/core.py", line 763, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.7/dist-packages/typer/main.py", line 500, in wrapper
    return callback(**use_params)  # type: ignore
  File "/usr/local/lib/python3.7/dist-packages/pms/cli.py", line 84, in serial
    with reader:
  File "/usr/local/lib/python3.7/dist-packages/pms/core/reader.py", line 124, in __enter__
    if not self.sensor.check(buffer, "passive_mode"):  # pragma: no cover
  File "/usr/local/lib/python3.7/dist-packages/pms/core/sensor.py", line 81, in check
    self.Message.decode(buffer, self.command(command))
  File "/usr/local/lib/python3.7/dist-packages/pms/sensors/base.py", line 59, in decode
    return cls.unpack(message, header, length)[cls.data_records]  # type: ignore[call-overload]
  File "/usr/local/lib/python3.7/dist-packages/pms/sensors/sensirion/sps30.py", line 43, in unpack
    raise SensorWarmingUp("short message: no data")
pms.SensorWarmingUp: short message: no data
root@raspberrypi:/home/pi# pms -m SPS30 -n 1 -i 1 -s /dev/ttyAMA0 serial -f pm
b'~\x00\x00C\x00\xbc~~\x00\x03\x00(@\xb1\x1e\x13A!\x87\xf1AXx}Acu_A\xdc\xcduB\x1c\x0f\xf4B/\x97}B3l\xffB3\xfc:?j\x98}D~'
b'~\x00\x00C\x00\xbc~~\x00\x03\x00(@\xb1\x1e\x13A!\x87\xf1AXx}Acu_A\xdc\xcduB\x1c\x0f\xf4B/\x97}B3l\xffB3\xfc:?j\x98}D~'
b'~\x00\x03\x00(@\xb1\x1e\x13A!\x87\xf1AXx}Acu_A\xdc\xcduB\x1c\x0f\xf4B/\x97}B3l\xffB3\xfc:?j\x98}D~'
b'~\x00\x03\x00(@\xab\x14\xe6A\x1b\xb2\xd3AP\x80(A[\x0f\x9eA\xd5\xb3\x9dB\x16\xd7iB)\x9c\xfbB-L_B-\xd6\x14?j\x96X\x82~'
b'~\x00\x03\x00(@\xab\x14\xe6A\x1b\xb2\xd3AP\x80(A[\x0f\x9eA\xd5\xb3\x9dB\x16\xd7iB)\x9c\xfbB-L_B-\xd6\x14?j\x96X\x82~'
2021-09-01 08:56:44: PM1 5.3, PM2.5 9.7, PM4 13.0, PM10 13.7 μg/m3

[avaldebe]

It looks like pip did not install the version from github, most likely because it has the same version number that the one I asked to install earlier.

I hope this command works.

pip install --force-reinstall git+https://github.com/avaldebe/PyPMS.git@54f5fe4

PS: sorry for the inconvenience

[oylern]

No worries at all! Thank you for working on the fix. :)

I ran into the same problem as before initially, uninstalled pypms, but then still couldn't install it again. Turns out I needed to upgrade pip to a newer version than what was shipped with Raspbian (pip3 install --upgrade pip). Once I did that, I could install pypms from git successfully. Now it works perfectly. Thanks again!

root@raspberrypi:/home/pi# pms -m SPS30 -n 1 -i 1 -s /dev/ttyAMA0 serial -f pm
2021-09-02 09:25:42: PM1 23.8, PM2.5 26.2, PM4 27.0, PM10 27.2 μg/m3