Hello!
I was looking at my new Davis Vantage Pro2 console the other day and I suddenly realised that the barometer is shown as 1 decimal point on the console but Cumulus MX shows this as 2 decimal points. Does anyone know why the console only shows this as 1 and not 2 decimal points?
I was thinking if there was a way to change the barometer to 1 decimal point on Cumulus MX but then I'd loose accuracy.
Thanks,
William
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Latest Cumulus MX V3 release 3.28.6 (build 3283) - 21 March 2024
Cumulus MX V4 beta test release 4.0.0 (build 4017) - 17 March 2024
Legacy Cumulus 1 release v1.9.4 (build 1099) - 28 November 2014 (a patch is available for 1.9.4 build 1099 that extends the date range of drop-down menus to 2030)
Download the Software (Cumulus MX / Cumulus 1 and other related items) from the Wiki
Barometer On Davis Vantage Pro2 Console
- mcrossley
- Posts: 12686
- Joined: Thu 07 Jan 2010 9:44 pm
- Weather Station: Davis VP2/WLL
- Operating System: Bullseye Lite rPi
- Location: Wilmslow, Cheshire, UK
- Contact:
Re: Barometer On Davis Vantage Pro2 Console
The console uses 2dp for inHg which is sensible, and 1dp for hPa/mb which is also sensible. The data protocol uses 2dp so it can send inHg or hPa, but the hPa values are converted from inHg 2dp values, so not every second decimal place is not even available when using hPa, you will find it jumps between the available values.
Cumulus doesn't have any mechanism for convert Davis hPa values to 1dp, but I do myself and only display everything to 1dp on my website. Quoting hPa to 2dp is a nonsense, it equates to an elevation change of around 10 cm at sea level. If anyone can calibrate their barometer to that level of precision I'll buy them a beer! Plus the Davis applies a 'correction' to the readings to attempt to compensate for temperature and humidity variations.
Cumulus doesn't have any mechanism for convert Davis hPa values to 1dp, but I do myself and only display everything to 1dp on my website. Quoting hPa to 2dp is a nonsense, it equates to an elevation change of around 10 cm at sea level. If anyone can calibrate their barometer to that level of precision I'll buy them a beer! Plus the Davis applies a 'correction' to the readings to attempt to compensate for temperature and humidity variations.
-
- Posts: 240
- Joined: Tue 24 Nov 2015 9:07 am
- Weather Station: Davis Vantage Pro2
- Operating System: Windows 11 64-bit
- Location: Newton Poppleford, Devon, UK
- Contact:
Re: Barometer On Davis Vantage Pro2 Console
Ok, thanks Mark.
How did you manage to get everything to measure in 1 decimal point?
How did you manage to get everything to measure in 1 decimal point?
-
- Posts: 2433
- Joined: Wed 08 Jun 2011 11:19 am
- Weather Station: Davis Vantage Pro 2 + Ecowitt
- Operating System: GNU/Linux Ubuntu 22.04 LXC
- Location: Alcaston, Shropshire, UK
- Contact:
Re: Barometer On Davis Vantage Pro2 Console
Just walking round the room the console is in will affect the readings at 2dp precision, so noise will drown any true atmospheric signal!mcrossley wrote:Quoting hPa to 2dp is a nonsense, it equates to an elevation change of around 10 cm at sea level.
- steve
- Cumulus Author
- Posts: 26702
- Joined: Mon 02 Jun 2008 6:49 pm
- Weather Station: None
- Operating System: None
- Location: Vienne, France
- Contact:
Re: Barometer On Davis Vantage Pro2 Console
I increased the number of decimal places for Davis stations in Cumulus on the advice of Davis (to 2 for hPa/mb and 3 for inHg). Make of that what you will.
Eventually MX will allow the user complete control of the number of decimal places displayed and logged for each sensor, then people can do exactly as they like, in either direction.
Eventually MX will allow the user complete control of the number of decimal places displayed and logged for each sensor, then people can do exactly as they like, in either direction.
Steve
- steve
- Cumulus Author
- Posts: 26702
- Joined: Mon 02 Jun 2008 6:49 pm
- Weather Station: None
- Operating System: None
- Location: Vienne, France
- Contact:
Re: Barometer On Davis Vantage Pro2 Console
I'll add an ini-file switch to the next build of MX to turn off the increased pressure DPs for Davis stations.
Steve
-
- Posts: 240
- Joined: Tue 24 Nov 2015 9:07 am
- Weather Station: Davis Vantage Pro2
- Operating System: Windows 11 64-bit
- Location: Newton Poppleford, Devon, UK
- Contact:
Re: Barometer On Davis Vantage Pro2 Console
You're just amazing, Steve. You solve everything, thanks very much.