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Calibrating extra sensor and adding a display

Discussion of version 3 of Cumulus, which runs on Windows, Linux, and OS X. All Cumulus MX queries in here, please.
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Jonathan Jefferies
Posts: 25
Joined: Fri 22 Apr 2016 5:38 pm
Weather Station: Instromet
Operating System: Raspberry pi
Location: Northamptonshire

Calibrating extra sensor and adding a display

Post by Jonathan Jefferies » Tue 21 Nov 2017 1:44 pm

Hi.
I run Cumulus mx with a raspberry pi.

Ive ticked the box to add an extra sensor which is measuring grass temperature. This is reading 2c lower than the normal displayed air temperature. How can i adjust the calibration offset to bring the grass temperature in line with the displayed air temperature.

Also i would like to display grass temperature on my website/cumulus page like the other parameters measured, how could i do this. At the moment i cant seem to record the lows of grass temperature without looking back every hour to find the lowest temperature as it is not recorded.

Hope all makes sense..

Many thanks

Jonathan Jefferies
Check out raundsweather.co.uk my weather website

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steve
Cumulus Author
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Re: Calibrating extra sensor and adding a display

Post by steve » Tue 21 Nov 2017 2:48 pm

Wouldn’t grass temp normally be lower than air temp anyway, or is that not the case?

There is no calibration setting for extra sensors in Cumulus, and it doesn’t record highs and lows for extra sensors. You could record the values in a database and extract highs and lows from that. There are web tags for extra sensors, which you could use in a web page processed by Cumulus - see the web site section of the wiki.
Steve

Jonathan Jefferies
Posts: 25
Joined: Fri 22 Apr 2016 5:38 pm
Weather Station: Instromet
Operating System: Raspberry pi
Location: Northamptonshire

Re: Calibrating extra sensor and adding a display

Post by Jonathan Jefferies » Tue 21 Nov 2017 4:09 pm

Steve

Thank you for the reply.

Im putting the grass temperature sensor in my Stevenson screen to calibrate it against the air temperature sensor so i know it reads the same, then i can put the sensor above the grass knowing its reading correctly.

Ok i will have a go at producing a database.

Thank you.
Check out raundsweather.co.uk my weather website

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steve
Cumulus Author
Posts: 26714
Joined: Mon 02 Jun 2008 6:49 pm
Weather Station: None
Operating System: None
Location: Vienne, France
Contact:

Re: Calibrating extra sensor and adding a display

Post by steve » Tue 21 Nov 2017 5:03 pm

If you need any help with the database settings in MX, just ask and someone should be able to help. There may well be information in the wiki.
Steve

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