ignore_zero_wind with a broken anemometer

[Emiliano]

Hi,

my anemometer is definitively broken due to too much wind in the current season and it is reporting wrong values,

but the wind direction still being reported correcty. So I've modified the weewx.conf:

[StdWXCalculate]
    ignore_zero_wind = False

[StdCalibrate]
    [[Corrections]]
        windSpeed = None

Unfortunately the windDir is always archived as 0, because the VecStats.vec_dir uses the speed to calculate the wind vector
What do you suggest to continue archiving the Direction without having the Speed?

This is a session with the Simulator Driver and a forced correction windDir = 90:

LOOP:   2018-11-24 18:34:04 CET (1543080844) ... usUnits: 1, windDir: 90, windGust: 2.47898288563e-08, windGustDir: 359.999999256, windSpeed: None
LOOP:   2018-11-24 18:34:09 CET (1543080849) ... usUnits: 1, windDir: 90, windGust: 2.23108460595e-07, windGustDir: 359.999993307, windSpeed: None
LOOP:   2018-11-24 18:34:14 CET (1543080854) ... usUnits: 1, windDir: 90, windGust: 6.19745716968e-07, windGustDir: 359.999981408, windSpeed: None
LOOP:   2018-11-24 18:34:19 CET (1543080859) ... usUnits: 1, windDir: 90, windGust: 1.21470158376e-06, windGustDir: 359.999963559, windSpeed: None
LOOP:   2018-11-24 18:34:24 CET (1543080864) ... usUnits: 1, windDir: 90, windGust: 2.0079760441e-06, windGustDir: 359.999939761, windSpeed: None
LOOP:   2018-11-24 18:34:29 CET (1543080869) ... usUnits: 1, windDir: 90, windGust: 2.99956906957e-06, windGustDir: 359.999910013, windSpeed: None
LOOP:   2018-11-24 18:34:34 CET (1543080874) ... usUnits: 1, windDir: 90, windGust: 4.1894806273e-06, windGustDir: 359.999874316, windSpeed: None
LOOP:   2018-11-24 18:34:39 CET (1543080879) ... usUnits: 1, windDir: 90, windGust: 5.57771067999e-06, windGustDir: 359.999832669, windSpeed: None
LOOP:   2018-11-24 18:34:44 CET (1543080884) ... usUnits: 1, windDir: 90, windGust: 7.16425917968e-06, windGustDir: 359.999785072, windSpeed: None
LOOP:   2018-11-24 18:34:49 CET (1543080889) ... usUnits: 1, windDir: 90, windGust: 8.94912607485e-06, windGustDir: 359.999731526, windSpeed: None
LOOP:   2018-11-24 18:34:54 CET (1543080894) ... usUnits: 1, windDir: 90, windGust: 1.0932311306e-05, windGustDir: 359.999672031, windSpeed: None
LOOP:   2018-11-24 18:34:59 CET (1543080899) ... usUnits: 1, windDir: 90, windGust: 1.31138148092e-05, windGustDir: 359.999606586, windSpeed: None
LOOP:   2018-11-24 18:35:04 CET (1543080904) ... usUnits: 1, windDir: 90, windGust: 1.54936365098e-05, windGustDir: 359.999535191, windSpeed: None
LOOP:   2018-11-24 18:35:09 CET (1543080909) ... usUnits: 1, windDir: 90, windGust: 1.80717763305e-05, windGustDir: 359.999457847, windSpeed: None
LOOP:   2018-11-24 18:35:14 CET (1543080914) ... usUnits: 1, windDir: 90, windGust: 2.08482341861e-05, windGustDir: 359.999374553, windSpeed: None
LOOP:   2018-11-24 18:35:19 CET (1543080919) ... usUnits: 1, windDir: 90, windGust: 2.38230099843e-05, windGustDir: 359.99928531, windSpeed: None
REC:    2018-11-24 18:35:00 CET (1543080900) ... usUnits: 1, windDir: 359.999606586, windGust: 1.31138148092e-05, windGustDir: 359.999606586, windrun: 0.333333333333, windSpeed: None

emiliano

[Thomas Keffer]

But, it's not archived with value 0. The value is 356.999606586, which, while quite close to zero, is not zero.

Give the simulator time. It starts with a north wind, then slowly clocks to NW.

To speed it up, set 

mode=generator

under section [Simulator].

-tk

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[Emiliano Parasassi]

Thank you Thomas,

with the generator mode the windDir value is calculated about 260 but I would expect near 90 !

e.

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[Thomas Keffer]

Yes, I see what you mean about vec_dir in the accumulators. It's there because the average wind direction of [359, 0, 1] is 0, not 180.

It is possible to change the behavior of the accumulators so they emit the last value (rather than the average), but it would take me some time to think about how to do it. Frankly, you're better off fixing your instrument. No amount of software can make up for a bad measurement!

-tk