New User: First Problem

[Alan Salmon]

Hello everyone.

I installed weewx for the first time today on a Raspberry Pi Zero 2W, using a Fine Offset 3081 station that I used for about 10 years until the local cockatoos decided it would be fun to dismantle it!

It came up on the second attempt after a few minor adjustments to the config file, paths, etc. (I used the pip install method on Debian 11).

The hardware console is operating correctly as expected, but weewx is giving me the following error:

Feb  6 22:26:01 bigfish-08 weewxd[1909]: WARNING weewx.qc: 2024-02-06 22:26:02 AEDT (1707218762) LOOP value 'pressure' 0.0 outside limits (24.0, 34.5)

As the value displayed on the console (roughly) agrees with a BME680 I have running, can anyone suggest where I should start trying to solve this?

Note that I am configured for metric with barometric pressure in hectopascals (hPa) which is currently just over 1010hPa, so I am at a bit of a loss as to why it is showing '0.0' and where the range "24.0 to 34.5' comes from.

The error has been consistent for the 9 hours it has been running.

Thanks for any advice you can offer.

[michael.k...@gmx.at]

The warning tells you: WeeWX is receiving 0.0 for "pressure". You say, "The hardware console is operating correctly as expected", so the problem is somewhere in between the hardware and the LOOP. It may be, that your hardware/driver combination doesn't supply a valid value for "pressure" (it should return "None" instead of "0.0" in this case), did you try "barometer" or "altimeter" instead? You can also check in your database, if there are values for these types. If so, take a look into this article, to make sure, you really use the correct type for your needs. Having only one out of the three "pressure", "altimeter" and "barometer", it should be possible to calculate the others, when you have the altitude, the temperature and humidity (or even something in addition to that).

[Tom Keffer]

Good suggestions from Michael. All I can add is to be sure and read the wiki article Barometer, pressure, altimeter on the differences between the three.

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[gszla...@gmail.com]

I'll take a wild guess..maybe it's a unit mismatch of some sort. Try switching your console to inHg instead of hPa (temporarily) and see if that works.

[gjr80]

This is unlikely to be a units problem, rather it is likely to be one of incorrect (or a lack of) data from the station. FineOffset stations provide the WeeWX field pressure and WeeWX will then calculate fields barometer and altimeter if possible. The log entry provided indicates that WeeWX has ended up with a pressure value of zero which is outside the (default) QC limits set in [StdQC] [[MinMax]] in weewx.conf. You need to be looking at what data is being emitted by the station/driver; with the fousb driver you should be able to use weectl device to interrogate the station and, among other things, display live data from the station. The result may well give you an indication of where the problem is.

As an aside the units used within the [StdQC] [[MinMax]] stanza and the display units in reports (or on a station hardware display) bear no direct relationship. [[MinMax]] settings default to the units used in the WeeWX database; however, units can be specified. As it happens the default [[MinMax]] settings have US customary units specified. You may find it beneficial to read through the [StdQC] reference.

Gary