That would work, other than having the station console reading uncorrected pressure.
Or, the OP could just move to some place at sea level. :) -Les > On 16 Feb 2020, at 21:38, Andrew Milner <[email protected]> wrote: > > well if it is hard coded for pressure then the station adjustment made by the > OP should be to set his station to a known sea level pressure and subtract a > correction for altitude (2.6 for 2300 ft I think) and all should then be ok > > On Monday, 17 February 2020 07:09:35 UTC+2, ln77 wrote: > Setting those that way won’t fix the problem. Those settings are hints to > weewx about what to use when the weather station hardware provides multiple > values. The WS28XX driver is hard-coded to interpret the data from the > station as weewx “pressure,” and that is the only pressure-related datum sent > by the WS28XX stations. > > -Les > > > >> On 16 Feb 2020, at 17:09, Dan Blanchard <[email protected] <>> wrote: >> >> Andrew, I've set barometer = hardware and altimeter = software and pressure >> = software. I've restarted weewx, but nothing has changed in the Loop. >> >> On Friday, February 14, 2020 at 9:30:06 PM UTC-8, Andrew Milner wrote: >> if indeed, and i now tend to agree, the station displays and outputs a >> manually adjusted barometer which is set to a sea level reading from local >> weather stations and not pressure then barometer should be set to hardware >> and pressure and altimeter set to software, and not as i previously >> suggested. >> >> On Saturday, 15 February 2020 06:22:07 UTC+2, ln77 wrote: >> OK… The “pressure” that your station is displaying is what it should be >> displaying: the ambient air pressure, correct for your altitude. In weewx, >> this is called “barometer” because that is what weather stations report for >> barometric pressure. “Altimeter” is basically the same thing; there are >> differences in exactly how it is corrected, but those differences are minor >> and can be ignored for now. The distinction between what weewx calls >> “barometer” and “pressure” is important, though, for anyone more than a few >> hundred feet above sea level. >> >> From the manual, it appears that the WS-2813 uses a simple method for >> correcting to sea level, by allowing the user to adjust a correction factor >> that is applied to the actual measured pressure until the reading matches >> some local reference barometric pressure report. This automatically also >> corrects for any errors in the pressure sensor itself, a handy bonus. >> There’s not reference in the manual to any other kind of pressure being >> reported, so it only makes sense that what it transmits via the USB >> interface is also this corrected pressure, i.e., “barometer.” But the >> WS28XX driver documentation, and as far as I can tell the code also, assume >> that the pressure reading fro the hardware is what weewx calls “pressure,” >> that is, the actual ambient pressure before correction for altitude. As far >> as I can tell, all of the WS28XX LaCrosse stations work the same way as >> yours and actually send the corrected barometer reading. Maybe because the >> LaCrosse documentation calls it “pressure,” it was mistakenly interpreted as >> raw pressure reading in the driver. >> >> The bottom line is, I’m pretty sure the issue is that the driver is wrong. >> I’m not familiar enough with that part of the weewx code to offer a fix, but >> it should be pretty simple for someone who is familiar with that code. >> >> -Les >> >> >> >>> On 14 Feb 2020, at 19:44, Dan Blanchard <[email protected] <>> wrote: >>> >>> It is likely that I am mis-using the terms altimeter, barometer, and >>> pressure. I'll clarify what I mean here. >>> >>> What I previously defined as 'correct' pressure is that the pressure >>> reported by my station (LaCrosse WS-2813U-IT) matches the National Weather >>> Service barometer reading >>> (https://forecast.weather.gov/MapClick.php?lat=47.715130000000045&lon=-116.94667999999996#.XkdkXDFKiUk >>> >>> <https://forecast.weather.gov/MapClick.php?lat=47.715130000000045&lon=-116.94667999999996#.XkdkXDFKiUk>). >>> For example, right now my station is reading 30.06 pressure and the NWS >>> site is reporting 30.0 barometer. Ultimately I just want my WS-2813 >>> pressure reading to match the WU pressure reading >>> (https://www.wunderground.com/dashboard/pws/KIDPOSTF43 >>> <https://www.wunderground.com/dashboard/pws/KIDPOSTF43>). Right now it >>> appears that WU is reading the weewx barometer reading. Is there a way to >>> have weewx report the pressure reading to WU? >>> >>> My WS-2813 outputs the manually adjusted pressure in the Loop records (see >>> attachment). I don't see a way to change that. Here is a link to the >>> manual >>> (https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf >>> >>> <https://www.lacrossetechnology.com/media/catalog/product/w/s/ws-2813u-it.pdf>). >>> >>> On Friday, February 14, 2020 at 9:22:17 AM UTC-8, Andrew Milner wrote: >>> I would expect you to be reporting barometer = sea level pressure which is >>> pressure adjusted for temperature and altitude because weather stations >>> always report sea level pressures. >>> >>> Is what you call 'correct' pressure the raw pressure of the instrument or a >>> pressure which you have set. Does the station output the raw pressure or >>> the manually adjusted pressure in the loop records? >>> >>> >>> >>> On Friday, 14 February 2020 18:07:15 UTC+2, Dan Blanchard wrote: >>> Andrew, that's a good questions; let me clarify. >>> >>> This issue started when Weather Underground (WU) stopped showing my station >>> on the maps. I found out that was because I was reporting an incorrect >>> barometric 'pressure.' As I dug into the details I found that my station >>> was displaying the correct pressure (29.xx) but by the time it got to WU, >>> it was displaying the barometer reading (32.xx) from weewx. This can also >>> be demonstrated by looking at the data displayed at >>> /var/www/html/weewx/index.html (see attachment) so I assume that weewx is >>> taking the pressure from my station and somehow converting it or exchanging >>> it for barometric pressure before it gets uploaded to WU. I just want the >>> pressure from my unit to be what is reported to WU. >>> >>> Side note: I've been running this station for many years on a Windows based >>> system and it has been working fine. So I know the hardware side is >>> working; just something different about how weewx reports pressure (or >>> barometer, or altimiter). >>> >>> Does that help clarify my issue? >>> >>> On Friday, February 14, 2020 at 2:24:31 AM UTC-8, Andrew Milner wrote: >>> I am not sure I understand what you think is wrong with the readings of >>> Pressure 29.89 >>> Barometer 32.609 >>> Altimeter 32.40 >>> and why you believe something is wrong >>> >>> >>> On Friday, 14 February 2020 05:57:36 UTC+2, Dan Blanchard wrote: >>> Altitude is 2,320 ft. and the values are in the screen shot on the previous >>> post. Did you see that? >>> >>> On Thursday, February 13, 2020 at 7:16:11 PM UTC-8, Andrew Milner wrote: >>> I give up - looks correct to me. >>> >>> have you run from the command line and seen the LOOP and REC data weewx is >>> receiving? >>> >>> what altitude is your station, and what values are you currently getting >>> for pressure, barometer and altimeter? >>> >>> On Thursday, 13 February 2020 22:10:08 UTC+2, Dan Blanchard wrote: >>> I don't know, but that makes sense so I did it. I'm still not getting >>> desired results though. >>> >>> On Thursday, February 13, 2020 at 9:38:55 AM UTC-8, Kevin Davis wrote: >>> Do you need a space between your minus sign and the adjustment value? >>> >>> On Thu, Feb 13, 2020 at 9:32 AM Dan Blanchard <[email protected] <>> wrote: >>> Hey Andrew, will you please look at the attached screen shots and let me >>> know if this looks correct? >>> >>> Do I need to restart (sudo /etc/init.d/weewx restart) after I make these >>> changes? I have and the changes don't seem to be taking effect. Is there >>> something else I need to do? >>> >>> With regard to the barometer and altimeter having the same settings; I have >>> probably misled. They are not exactly the same but they were relatively >>> close to each other compared to the pressure value. Here are the current >>> readings as of now when I run sudo weewxd /etc/weewx/weewx.conf. >>> >>> pressure: 29.98 >>> altimeter: 32.57 >>> barometer: 32.74 >>> >>> >>> >>> On Thursday, February 13, 2020 at 12:07:50 AM UTC-8, Andrew Milner wrote: >>> If you have a LaCrosse WS28xx station then according to the hardware guide >>> the station outputs PRESSURE in weewx terminology - regardless of what >>> LaCrosse call it - and weewx should calculate barometer and altimeter >>> settings. >>> >>> If pressure is incorrect then it can be adjusted as you specified - by >>> adjusting pressure (not barometer or altimeter) >>> >>> Make sure pressure is set to use hardware and barometer and altimeter are >>> set to use software. >>> >>> I am surprised barometer and altimeter are the same values - have you set >>> the station's altitude in weewx.conf, and have you specified software >>> generation for the values? >>> >>> >>> >>> On Thursday, 13 February 2020 09:23:27 UTC+2, Dan Blanchard wrote: >>> Andrew, are you suggesting that I make a 'correction' entry under >>> [StdCalibrate] such as barometer = barometer -2.8 assuming that I am >>> getting a pressure reading of 30.13 and Barometer and ALtitude readings of >>> 32.93? >>> >>> (see attached screenshot) >>> >>> On Wednesday, February 12, 2020 at 7:42:08 PM UTC-8, Andrew Milner wrote: >>> 1. use stdcalibrate section of weewx.conf >>> http://weewx.com/docs/usersguide.htm#StdCalibrate >>> <http://weewx.com/docs/usersguide.htm#StdCalibrate>2. FO station = Fine >>> Offset weather station >>> >>> >>> >>> On Wednesday, 12 February 2020 22:15:48 UTC+2, Dan Blanchard wrote: >>> Andrew, how do I calibrate the pressure in weewx? Also, what's a FO station? >>> >>> On Tuesday, February 11, 2020 at 8:01:08 PM UTC-8, Andrew Milner wrote: >>> check that the absolute pressure is correct - I have had a FO station which >>> had a dodgy pressure sensor before now. Calibrating pressure in weewx >>> solved it. >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "weewx-user" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected] <>. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/weewx-user/08c79655-b1af-4134-9a2b-82a4f52f051f%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/weewx-user/08c79655-b1af-4134-9a2b-82a4f52f051f%40googlegroups.com?utm_medium=email&utm_source=footer>. >>> >>> -- >>> You received this message because you are subscribed to the Google Groups >>> "weewx-user" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected] <>. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/weewx-user/a24bec68-9459-43f4-8765-933c0c1f2490%40googlegroups.com >>> >>> <https://groups.google.com/d/msgid/weewx-user/a24bec68-9459-43f4-8765-933c0c1f2490%40googlegroups.com?utm_medium=email&utm_source=footer>. >>> >> >> >> -- >> You received this message because you are subscribed to the Google Groups >> "weewx-user" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to [email protected] <>. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/weewx-user/4674c533-01b2-48fa-bb3f-707a6e24dd29%40googlegroups.com >> >> <https://groups.google.com/d/msgid/weewx-user/4674c533-01b2-48fa-bb3f-707a6e24dd29%40googlegroups.com?utm_medium=email&utm_source=footer>. >> > > > -- > You received this message because you are subscribed to the Google Groups > "weewx-user" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected] > <mailto:[email protected]>. > To view this discussion on the web visit > https://groups.google.com/d/msgid/weewx-user/099b88fb-5eb5-4ad5-8d2a-fe32c19bc2c7%40googlegroups.com > > <https://groups.google.com/d/msgid/weewx-user/099b88fb-5eb5-4ad5-8d2a-fe32c19bc2c7%40googlegroups.com?utm_medium=email&utm_source=footer>. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. 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