Oops..sorry just saw that you already did the firmware update. I would try Aercus support and troubleshoot the receiver for power/disappearing/random changing settings.
On Monday, November 11, 2024 at 12:59:18 PM UTC-5 Ashley Hinton wrote: > Thanks for your reply. > > The station is a weathersleuth professional, apologies I should have been > clearer. When I bought it I figured because of weewx I didn't need, or > want, an indoor screen. > > https://www.aercusinstruments.com/aercus-instruments-weathersleuth-professional-ip-weather-station-with-direct-real-time-internet-monitoring/ > > Setting the station: > Absolute pressure offset = 0 > Relative pressure offset = 0 > > The LCD screen in the barometer transmitter is showing the same value as > both absolute & relative pressure on the live data webpage. > > If I stop weewx and listen for the data on the relevant tcp/ip port this > is what the station sends: > > sudo nc -l 7890 > > GET > /weatherstation/updateweatherstation.php?ID=***&PASSWORD=***&tempf=53.6&humidity=76&dewptf=46.2&windchillf=53.6&winddir=31&windspeedmph=0.00&windgustmph=0.00&rainin=0.00&dailyrainin=0.00&weeklyrainin=0.00&monthlyrainin=0.00&yearlyrainin=29.46&solarradiation=110.48&UV=0&indoortempf=67.3&indoorhumidity=61 > *&baromin=30.59*&dateutc=now&softwaretype=WH2600%20V2.2.8&action=updateraw&realtime=1&rtfreq=5 > > HTTP/1.0 > > The *baromin* value is the relative pressure. It doesn't send any other > pressure values. > > If I offset in hardware it works and weewx reports barometer correctly > compared to local reliable sources but it doesn't (always!) survive a power > outage. Whats worse is the relative offset doesn't even stay defaulted to 0 > - give it a few minutes and it does its own thing, literally a random minus > value based on no other setting I can find, unless I manually change the > offset value again but it only stays until it loses power. > > My thoughts were to map *baromin *(relative pressure) from the station to > *pressure > *in weewx, leave the station relative pressure offset at zero and let > weewx calculate barometer as you suggest, of course double checking the > altitude value in weewx.conf is correct. Now I know it won't work after a > power cut, and I suspect even if I manually set zero offset and kill the > power it will initially return with zero and then change to a random value. > > Station firmware is up to date - v2.2.8 is the last available. > > However I'm starting to think I could get the pressure reading from > elsewhere. I'm running an Arduino in the greenhouse which is providing some > extra sensor data picked up by weewx using the Weewx MQTT Subscribe > extension. > > Adding a barometric sensor to the Arduino should be pretty easy, mapping > its output to *pressure *in weewx. > > Either that or read the station live data webpage into weewx but it seems > a lot of hassle compared to a buying a relatively cheap sensor. The one > I've just looked at claims an accuracy of 0.01mbar. > > Maybe that's the solution - map an incoming MQTT topic > "greenhouse/absolutepressure" to pressure in weewx. > > [[[greenhouse/absolutepressure]]] #mqtt topic sent from Arduino > > name = pressure #weewx database table > > > .. and under > > [[Calculations]] > > > Change *prefer_hardware* in the following entries to: > > pressure = hardware > > altimeter = software > > barometer = software > > Which I think would ignore the station relative pressure (barometer) and > since its not sending absolute pressure anyway I need not worry about a > conflict between the station and what the Arduino would be sending. > > Also apologies again, I should have mentioned in my original post: > > Weewx v5.1.0 (installed via pip/venv) > Raspberry Pi 4 > Raspian (Debian) v12 Bookworm (arm64) > Aercus Instruments Weathersleuth Professional station. > > > On Friday 25 October 2024 at 12:03:49 UTC+1 gszla...@gmail.com wrote: > > --Hmm..if Absolute pressure and relative pressure = 0 (zero) your > barometer was not set up correctly and not calibrated correctly. II > absolute pressure = 0, you would be living in a vacuum! Or are you > referring to both offsets = 0? > > Your station is the weathersleuth IP? If so, you have an outside array, a > Wi-Fi gateway and a separate LCD indoor sensor with a barometer sensor: > Thermo-hygrometer-barometer transmitter (temperature/humidity/pressure). > > If your barometer is working, it should be reading the current atmospheric > pressure at your elevation (the elevation of your barometer). In your > calibration screen, you should see an absolute pressure offset and a > relative pressure offset. These fields are used to adjust your absolute > pressure and relative pressure, respectively. > > It is best to start over from scratch. Set both offsets back to zero in > the calibration screen. Verify that the pressure showing on the LCD screen > of the external Thermo-hygrometer-barometer transmitter is equal to the > absolute pressure on your console. Maybe it's under the Live data tab? > > You will have to calculate your relative pressure offset which depends on > your elevation. > Your weather station appears to be similar to an Ecowitt or Ambient > weather station therefore calibration procedures should be the same. Read > the barometer wiki to set your elevation and calibrate your barometer: > > http://meshka.eu/Ecowitt/dokuwiki/doku.php?id=barometer#calibration_wi-fi_gateways > > Your other question relates to WeeWX. You definitely do not want to pass > on your weather station's REL to WeeWX. Your weather station uses a single > fixed offset amount to do an estimate of sea level pressure. It can be a > reasonably close approximation but your readings will drift at times. You > would be far better off relying on WeeWX "barometer" pressure reading > because it uses an actual algorithm to calculate sea level pressure much > more accurately. To obtain the WeewX "barometer" reading you do not need to > configure anything. WeeWX will automatically calculate "barometer" from > your absolute pressure. BTW, the WeeWX "barometer" reading refers to SLP > (sea level pressure) that you might see on meteorological isobar > charts/surface analysis maps. If you follow the wiki's tutorials, your REL > (relative pressure) on your station's console should be an approximation of > the Altimeter setting. > > On Tuesday, October 22, 2024 at 4:43:24 AM UTC-4 Ashley Hinton wrote: > > Hi Michael > > Thanks for your reply. > > I did indeed read it which made me realise the issue is what WeeWx is > receiving (in relation to what its displaying on the webpage) & that it > needs to be calibrated somewhere. > I will first calibrate the hardware & then check what value from the > hardware is being displayed on the webpage. I'm pretty certain at the > moment Relative Pressure from hardware = Barometer on the webpage but will > double check so I know in future. > > Thanks again, > > On Monday 21 October 2024 at 04:56:31 UTC+1 michael.k...@gmx.at wrote: > > Hello, as a first step, did you read the following: > https://weewx.com/docs/5.1/usersguide/troubleshooting/meteo/ > > After that, do you know the pressure mappings console <=> weewx? Then, > which of the values (pressure, altimeter, barometer) is displayed on the > webpage? If you know all these things, calibrate your hardware according to > the manual and choose your desired obs_type to be displayed on the webpage. > > > Ashley Hinton schrieb am Sonntag, 20. Oktober 2024 um 22:08:57 UTC+2: > > Hello > > I've noticed my Barometer reading is different from other local sources: > the airfield just up the road from me, the local weather report, my phone > weather app - you name it, my readings did not agree. WeeWx was reporting > too high. > > I'm using an Aercus IP weather station and WeeWx is using the Interceptor > driver. > The weather station itself has its own calibration settings page, it has > two fields for calibrating pressure: > > Absolute Pressure (was, and is, set to 0) > Relative Pressure (was set to 30.00hpa which I'm sure was arbitrary, now > set to 0) > > If I change the Relative Pressure offset the Barometer value reported on > the resulting WeeWx-generated webpage changes, so I'm confident that > Relative Pressure is what's sent to WeeWx. > > My question is what to do - calculate and set the calibration in hardware, > or in WeeWx? What is generally preferred or considered the best option? > > Thanks! > > -- 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 weewx-user+unsubscr...@googlegroups.com. 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