I have two identical Davis Vantage Pro systems both running CumulusMX on their own Pi, one uses Davis data logger cable, the other a straight serial to USB cable with no logging. In both cases the Console display shows Daily Rain (in mm) 1.27 times larger than shown in the Cumulus display. I can correct Cumulus by changing the rain calibration factor from 1 to 1.27 but why should this be necessary?
Running CumulusMX b3173
John
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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 4019) - 03 April 2024
Legacy Cumulus 1 release 1.9.4 (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
Rain calibration
Moderator: mcrossley
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- Posts: 19
- Joined: Mon 17 Apr 2017 7:48 pm
- Weather Station: Davis VP
- Operating System: Pi Zero 2 W bullseye
Re: Rain calibration
Have answered my own question, console sees each seesaw click as 0.01" but Cumulusmx sees each click as 0.2mm instead of 0.254mm hence needs factor of 1.27 to correct.
- mcrossley
- Posts: 12765
- Joined: Thu 07 Jan 2010 9:44 pm
- Weather Station: Davis VP2/WLL
- Operating System: Bullseye Lite rPi
- Location: Wilmslow, Cheshire, UK
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Re: Rain calibration
Rather than setting a calibration factor, you should set the tipper size to 0.01" under the Davis advanced settings. If you do not set this, CMX infers the default tip size from your units, using the metric tipper size of 0.2mm if you use rainfall in mm, and the imperial 0.001" if you use inches.