Strange problem with SDS011 - Sensor stops working after some time

Configuration
1

I am having a strange issue, the sensor seems to work fine with the configuration below

  • platform: serial_pm
    serial_device: /dev/ttyUSB0
    scan_interval: 30
    name: Nova
    brand: novafitness,sds011

The problem is that it works fine for some time but then it stops updating the sensor values, even if I remove the sensor from my device. It still keeps showing the older values no matter what happens.

If I restart my device pi only then the values are updated correctly.

is there any solution to this problem. I am using raspberry pi 3

thanks,

2

Unfortunately SDS011 support in serial_pm platform is broken:

  • Home Assistant consumes data from sensor too slowly, so internal serial buffer grows and old measurements are read
  • there is no support for turning off laser between measurements resulting in short sensor life

I’ve created custom component for SDS011 addressing above issues: https://github.com/mrk-its/homeassistant-sds011

1 Like
3

I’ve changed my “configuration.yalm” file with the values it proposes. But still the readings, although they have decreased a lot, are still abnormally high.
Any suggestions for changes?
Thank you

4

hi mrk, do you know if the official support for this sensor has been improved or your custom component still is better than official? thanks.

5

Hi mrk, your custom component stopped working in 0.93. Any plans to update it?
Thanks.

6

@bezkod just fixed (directory layout of custom components changed in the meantime). Sorry it took so long.

7

hi mrk, thanks for updating the files.
However, I now face an issue:

Error while setting up platform sds011
Traceback (most recent call last):
  File "/home/pi/homeassistant/lib/python3.7/site-packages/homeassistant/helpers/entity_platform.py", line 150, in _async_setup_platform
    await asyncio.wait_for(asyncio.shield(task), SLOW_SETUP_MAX_WAIT)
  File "/usr/local/lib/python3.7/asyncio/tasks.py", line 416, in wait_for
    return fut.result()
  File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
    result = self.fn(*self.args, **self.kwargs)
  File "/mnt/hass/custom_components/sds011/sensor.py", line 42, in setup_platform
    config.get(CONF_NUMBER_OF_MEASUREMENTS, 5),
  File "/mnt/hass/custom_components/sds011/sensor.py", line 74, in __init__
    self._sensor = sds011.SDS011(device, use_query_mode=True)
AttributeError: module 'sds011' has no attribute 'SDS011'

Does it work for you now?

8

Yes, it works for me. Could you provide output of following command:

python3 -c "import sds011; print(sds011)"

Please use the same python interpreter you are using for hass. It seems it tries to import something different than sds011 module from requirements.