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Author Topic: Homemade Night Sky Cloud detector  (Read 969 times)

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Offline Zalmor

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Homemade Night Sky Cloud detector
« on: July 11, 2017, 01:31:23 PM »
Under Setup > Advanced > Boltwood tab;

Does that section still work?  I have '0.7' for Overcast and '1.8' for Clear sky which worked a long time ago, it was cloudy/overcast most of the night and my setup was still saying Clear night.  Just curious if anyone still uses that section.
Michael A

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Offline Weather Display

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Re: Homemade Night Sky Cloud detector
« Reply #1 on: August 12, 2017, 05:24:36 AM »
which version/build?

Offline Zalmor

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Re: Homemade Night Sky Cloud detector
« Reply #2 on: August 12, 2017, 10:54:18 AM »
I'm currently using WD 10.37S55, I recently changed the jar the sensor is in and the sensor.  Went to a slightly bigger jar, but still using the same type of sensor.  Real time graphs shows a large gap during the daytime hours between the temp in a jar and the outdoor temps.  Thinking it might be a seal problem on the jar if that section works for others at night time.
Michael A

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Offline Weather Display

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Re: Homemade Night Sky Cloud detector
« Reply #3 on: August 12, 2017, 10:17:24 PM »
do you actually have a boltwood sensor though?
(as otherwise you should be using the night time cloud sensor (home made) )

Offline Zalmor

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Re: Homemade Night Sky Cloud detector
« Reply #4 on: August 12, 2017, 11:15:04 PM »
do you actually have a boltwood sensor though?
(as otherwise you should be using the night time cloud sensor (home made) )
I don't have the Boltwood, I'm using the night time cloud sensor which is the home made one.
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Re: Homemade Night Sky Cloud detector
« Reply #5 on: August 13, 2017, 10:47:38 PM »
if you could zip and email me your settings I will investigate as spare time permits

Offline Budgie

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Re: Homemade Night Sky Cloud detector
« Reply #6 on: August 13, 2017, 11:52:08 PM »
If it's any help, I've set up a home made night cloud sensor using a Davis temp sensor in a jar today.
 
It's on test overnight to see what readings I get from it but I've initially set it up at 0.1 for overcast and 2.1 for clear sky. As it got dark this evening it went from "Overcast Night", "Mostly Cloudy Night" to "Cloudy Night" and then back to "Overcast Night". So the description is working on my version of WD, which is 10.37S Build 53.

This is a learning curve for me while I figure it out, so I'm not sure what's correct yet.
At the time of typing, the outside air temp is 10.3C and the cloud sensor is 10.6C and WD is reporting overcast, which it is.  :D
I've got the cloud sensor on station #8 at the moment but will move it to station #2 or 3 tomorrow for a faster update of the data.

Offline Zalmor

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Re: Homemade Night Sky Cloud detector
« Reply #7 on: August 14, 2017, 08:46:47 PM »
if you could zip and email me your settings I will investigate as spare time permits

Sent my settings a few minutes ago, should be there shortly to your 'info' email address.
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Offline Zalmor

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Re: Homemade Night Sky Cloud detector
« Reply #8 on: August 14, 2017, 08:54:47 PM »
If it's any help, I've set up a home made night cloud sensor using a Davis temp sensor in a jar today.
 
It's on test overnight to see what readings I get from it but I've initially set it up at 0.1 for overcast and 2.1 for clear sky. As it got dark this evening it went from "Overcast Night", "Mostly Cloudy Night" to "Cloudy Night" and then back to "Overcast Night". So the description is working on my version of WD, which is 10.37S Build 53.

This is a learning curve for me while I figure it out, so I'm not sure what's correct yet.
At the time of typing, the outside air temp is 10.3C and the cloud sensor is 10.6C and WD is reporting overcast, which it is.  :D
I've got the cloud sensor on station #8 at the moment but will move it to station #2 or 3 tomorrow for a faster update of the data.

I'll give this a try this weekend as I work 3rd shift (not home weekday nights), I might need to do my numbers over again since going to a larger jar.
Real time graphs for outdoor temp and temp in a jar were consistent with what I had once before.  I convert from F to C for the Clear (higher number) and Overcast (lower number) temperature settings.
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Offline Budgie

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Re: Homemade Night Sky Cloud detector
« Reply #9 on: August 14, 2017, 09:44:04 PM »
You probably will have to re-do the numbers with a larger jar as there's more volume, so the temp range will be different.

I'm starting with those numbers to see what I get and to wait for a clear night so I can see the actual difference between the cloud sensor & the outside temp. That'll give me the basic range to start from.  :wink:

Offline Weather Display

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Re: Homemade Night Sky Cloud detector
« Reply #10 on: August 15, 2017, 12:31:28 AM »
I have tested here with Zalmor settings and its working OK
(i.e I made it for testing where I could set the extra temperature 4 setting (and connected to my Davis station) and set the local time to night time

setting that extra temp sensor to close to the current outdoor temperature, the overcast icon showed OK
setting it to a value this is lower, and less than the threshold difference set to for clear sky , the clear sky icon was show ok

note that there is an average reading in use so it take a little while (minute) for the change

you can set to show debug info (in the misc setup) and then under view, debug info, the 2 values are shown (outdoor temperature and the extra temp sensor value)

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Re: Homemade Night Sky Cloud detector
« Reply #11 on: August 15, 2017, 06:06:01 AM »
Budgie, i found it easier to calibrate the night cloud temp sensor to the outside temp and then go from there. Zalmor, Budgie is correct, it will need calibrating again for the larger housing, when ever you change something on the night cloud or solar in a jar for that matter, you must always calibrate it again.

Offline Zalmor

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Re: Homemade Night Sky Cloud detector
« Reply #12 on: August 20, 2017, 02:33:53 AM »
you can set to show debug info (in the misc setup) and then under view, debug info, the 2 values are shown (outdoor temperature and the extra temp sensor value)
Where about do I set to show this info,( Misc > Program ) is it in the title bar/windows title bar your talking about?

Its Overcast outside tonight even though the local airport metar is showing clear skies.  I have the WD screen and logs using Fahrenheit.

Currently I have the following from the real-time screen
64.2 F Outside temp = 17.9 C
62    F Temp in jar    = 16.7 C

       above difference is 1.2 C, I enter in 1.5 C in the Overcast section portion and 3.9 C in for Clear skies. Waited a 3-5 minutes and its still showing up as 'Clear night'
Michael A

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Re: Homemade Night Sky Cloud detector
« Reply #13 on: August 20, 2017, 04:20:18 AM »
setup, advanced/misc
tick , log the raw data
I would set the lower threshold as less
i,e start at 1.1

Offline Zalmor

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Re: Homemade Night Sky Cloud detector
« Reply #14 on: August 20, 2017, 10:55:54 AM »
setup, advanced/misc
tick , log the raw data
I would set the lower threshold as less
i,e start at 1.1

OK, got that working.  The home cloud compare shows 13.7 - 31.7

WD Out side temp   56.7 F = 13.8 C
WD Temp in Jar      53.9 F = 12.2 C
WeatherLink shows 54 F on station #4 locally at that time

Not sure where WD is getting the 31.7 though?  :-k
« Last Edit: August 27, 2017, 02:05:24 PM by Zalmor »
Michael A

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