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Author Topic: Temperature and Dew Point Offset with 10.37S60  (Read 197 times)

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Offline MtnFlyer

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Temperature and Dew Point Offset with 10.37S60
« on: December 05, 2017, 04:50:25 AM »
- WD version 10.37S60
- Davis WM II w Rain Gage
- Dell XPS9100 running Win10 Pro, 64-bit, Intel i7 2.8Ghz, 8GB RAM
- Windows Defender Security Center for AV, with CCleaner monitoring

Back on 12/2 at sunrise an offset showed up briefly (for about 20 mins) in temperature and dewpoint (first figure). Tonight (12/4) at sunset, the problem reappeared, but now seems persistent. Coincidence that it appears at sunrise/sunset? I don't know. But another interesting thing is that the desktop WM II console shows the correct temp/DP, which is about 20F lower than WD is indicating.

Offline Weather Display

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Re: Temperature and Dew Point Offset with 10.37S60
« Reply #1 on: December 05, 2017, 06:52:31 AM »
I did fix a problem with the temperature reading from a Davis WMII
so try build 61?

Offline MtnFlyer

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Re: Temperature and Dew Point Offset with 10.37S60
« Reply #2 on: December 05, 2017, 01:50:18 PM »
I installed Build 61, but the offset in temp and DP (+20F) is still there.

Offline MtnFlyer

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Re: Temperature and Dew Point Offset with 10.37S60
« Reply #3 on: December 06, 2017, 04:59:14 AM »
Behaved most of today then, around 18:20, had a hiccup and is now offset +25F for temp and DP (image).

Offline MtnFlyer

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Re: Temperature and Dew Point Offset with 10.37S60
« Reply #4 on: December 07, 2017, 03:07:07 AM »
I captured some raw data coming into the computer, and I believe the correct data is coming in:

Example Packet:
06 01 97 02 AF 00 07 46 01 1D 5D 13 30 5F 21 00 00 AD 88

I don't have the 'key', but I spent some time trying to decode it. I believe the outdoor temperature is represented by the digits in positions 5 and 6: "AF 00". Which, since LSB is first, is 0x00AF = 175, or 17.5F. This is what my console reads. But WD shows 43.1F. So I'm not positive, but I think the station is sending correct data to the computer.

[EDIT] The offset is 25.6F or 256 in the stream, which is exactly 2^8. Interesting!
« Last Edit: December 07, 2017, 03:47:07 AM by MtnFlyer »

Offline Weather Display

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Re: Temperature and Dew Point Offset with 10.37S60
« Reply #5 on: December 07, 2017, 03:45:32 AM »
what I will need to do is capture the raw data in the format that WD uses
and so  I can see what is going on

Offline MtnFlyer

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Re: Temperature and Dew Point Offset with 10.37S60
« Reply #6 on: December 07, 2017, 03:49:14 AM »
Is that something I can do for you?

Offline Weather Display

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Re: Temperature and Dew Point Offset with 10.37S60
« Reply #7 on: December 07, 2017, 04:02:16 AM »
yes
if you tick
log the raw data
under setup, advanced/misc
then when the problem is occuring
email me the file
rawultimeterdata.txt
from where WD is installed
and what the temperature should be

Offline MtnFlyer

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Re: Temperature and Dew Point Offset with 10.37S60
« Reply #8 on: December 08, 2017, 04:09:04 AM »
Fixed! (Thanks, Brian)

 

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