Luftdaten Air Quality

I should have said DHT22 9I’m looking at the SHT series for something else
Alan

I don’t know what you mean by BME280 - is this sensor used with the SDS011? I have one connected nearby and could correct the PM values but would need to know the correction algorithm. Maybe the sensor needs just a little heating?

High RH is rare here but we have had a couple of fine rain or foggy days recently with the RH sitting in the very high 90’s. I have not seen the extreme particulate values that previous posts have suggested. My sensor is a PM-5003 connected wirelessly to a linux PC. There is some elevation of particulate values but I would expect that with the concurrent stagnant air conditions here at the end of the valley which trap woodfire smoke and other pollution.

I think it is the SDS011 that is mainly affected. In answer to Mihec the BME280 is an alternative T/H (and pressure) sensor. On opensensemap a lot of the humidity readings are stuck at 99.90% which is what my previous DHT22 t/h sensor always showed. If you use the T/H option I would recommend the BME sensor.
My site is at the far south western tip of the UK with very few pollution sources between me and the North Atlantic. With a west wind of about 10 knots currently I would expect quite low particle counts but actually they are all over the place so I strongly suspect the present fine particle fog we have. You can see what I mean on the Luftdaten map site. If the wind is in the right quarter (and light) I can pretty well tell when my neighbours light their woodburners. The SDS011 may not be the most accurate but is affordable and simple enough to allow a lot of users to participate so it is enough to show general pollution trends over a wide area.
Regards
Alan

In the last half hour it has started raining and cleared to fog - reading now more normal - does rather confirm the fog affect. You can also see what I mean on my site www.greatbosullow.net
Alan

That’s very interesting, on my sensor I don’t believe I have ever seen such a huge difference between PM 10 and the others 8O

Strangely a couple stations in the far west of France and another UK station to the NW of me sometimes show high readings with a west wind - with the proximity to the Atlantic I wonder if the humidity can contain dissolved salt.
Alan

I used to live on the pacific coast and the fog there certainly had salt content.

After few days observation I think the fan is not rotating. Is there any diagnostics (apart from my ear) to tell if it

I think the fan only runs when it is taking readings but I can’t really check as my sensors are quite high up a wall.
And Brian - I would like to use the luftdaten temperature and humidity but the wmr300 produces the indoor values so I guess I need the override. Looking at airquality2.txt the values for TH are there with the sensor described as BME280 as attached.
Best wishes
for 2019
Alan


airquality2.txt (469 Bytes)

Copied from luftdaten FAQ.

Der von uns verwendete Sensor SDS011 hat laut Datenblatt eine Lebensdauer im Dauerbetrieb von ca. 8.000 Stunden. [b]Unsere Firmware schaltet deshalb den Sensor nur f

What firmware are you guys at.
I have set to update automatically.
I think I got a new one last week, had to pull the powerplug to get it going again.

Firmware-version: NRZ-2018-123B

Hi - Yes the firmware is the same NRZ-2018-123B. I have had occasional re-starts - not sure why but I’ve only had to pull the plug once and that was to get the sensor back on the network.
Alan

And Brian - I would like to use the luftdaten temperature and humidity but the wmr300 produces the indoor values so I guess I need the override. Looking at airquality2.txt the values for TH are there with the sensor described as BME280 as attached. Best wishes for 2019 Alan

there should be a airquality3.txt file?
I will need to add override for wmr300 data

[quote author=Weerstation link=topic=67338.msg541485#msg541485 date=1546096434]
Copied from luftdaten FAQ.

Der von uns verwendete Sensor SDS011 hat laut Datenblatt eine Lebensdauer im Dauerbetrieb von ca. 8.000 Stunden. [b]Unsere Firmware schaltet deshalb den Sensor nur f

Thanks Brian
The only files I see in wdisplay are airqualityaqi.inf and airquality2.txt
Alan

you would need to be using the latest
cronairquality.exe version
1.5
modified create/time on that file should be 26 Nov
yes?

Thanks Brian - The cronairquality.exe is dated 26/11/2018 but the version says 1.0.0.0
It was in weatherdisplaytest.zip which I didn’t download until 19/12/2018 I’ll check if there is a later one.
Alan

Hi Brian I downloaded the zip file in Suggestions (26/11/2018) again and still get just airquality2.txt and the cronairquality.exe is also 1.0.0.0
Alan

the version number is shown when you actually open the program (i.e make it visible from the icon from the system tray) but you would need to be fast
anyway, use this test version
backup your current version
and see if it shows a message when its run
http://www.weather-display.com/downloadfiles/cronairquality.zip