Category Archives: Algemeen


For the first time in a long time we have snow. For one day – it will melt around noon – and only one to two centimetres, but nonetheless it is always breathtaking to see the world change overnight if you are not really accustomed to snow.

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Air Quality sensors on the Raspberry Pi

On the 7th of April 2020 I wrote about the Website Generator of CumulusUtils. That appeared to be somewhat bigger than I expected, simply because it was about a full blown website with users interacting. And interaction generates comments. All has now stabilised and CumulusUtils works fine. 

Meanwhile, on the background I had been working on a project to get going with air quality sensors like the PMS1003 ($14,20 at AliExpress) or similar cheap serial devices. In the back of my head always has been the creation of a multi sensor ‘sniffing’-centre to get a complete overview of the local airquality. Something worthwhile: I grew up in the neighbourhood of Rotterdam/Pernis an area known for its bad air and now I live south of Delfzijl, a small harbour in the North  of the Netherlands with relative big industry area. 30 km North from there there are two large coal power plants and smog condition occur several times per year, though not often.

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Change of release post on Cumulus Support forum

Since 21 april 2020 CumulusUtils has its own subforum on the Cumulus Support forum. That makes things clearer and creates better oversight. However, many links in the blogs before that date contain a link to the old release topic. I did change some recent ones but left the older topics untouched. If you encounter such link, remember to go here and not there.

Sites which carry the Fire Weather Index pwsFWI

This blog message contains a list of sites, which carry the pwsFWI Fire Weather Index. Please look here for more information, or look here for it’s distribution location on the Cumulus support forum. Look here for its scientific background. Check out the map as well for stations carrying CumulusUtils. 

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PWS – Calibrations: UT330C

For amateur meteorologists it is not always easy to calibrate their equipment, unless you yourself are working at a meteorological service or know people who do, it can be difficult to get the readouts correct within the limits of error of the weather station. I described this already a short time ago.

The UT330C

So now I have this new UT330C. I bought it in China and it arrived pretty fast (11 days). It measures temperature, humidity and pressure within reasonable error limits: Continue reading

Weerstation – De Wilgen

Nadat ik in 2013 mijn weerstation door omstandigheden had afgebroken, kwam ik pas in augustus 2018 op een plek waar ik het weer op kon bouwen en dat gebeurde uiteindelijk pas eind voorjaar 2019. Op 11 juni had ik de hele technische sequentie op orde en was het station live: om 15u38 ‘s middags verscheen de eerste meting in de logfile. De website volgde op 13 juni en op 24 juni startte ik dit blog.

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