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Outside Relative Humidity on WH1080

Discussion specific to Fine Offset and similar rebadged weather stations
taddeus
Posts: 38
Joined: Mon 19 Jan 2009 7:31 pm
Weather Station: PCE FWS20 (Fine Offset WH 1080)
Location: San Martino Siccomario - Italy

Re: Outside Relative Humidity on WH1080

Post by taddeus » Wed 11 Mar 2009 12:09 pm

Good :)

sdsi
Posts: 9
Joined: Tue 10 Mar 2009 11:05 am

Re: Outside Relative Humidity on WH1080

Post by sdsi » Wed 11 Mar 2009 12:15 pm

thanks. good idea.

sombedy who has got WH1081 (model without ferrite rod aerial) can write about values from humdity sensor...?

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hans
Posts: 171
Joined: Sun 18 Jan 2009 9:27 pm
Weather Station: wh1080 /ws4000(alecto) XP-sp2
Operating System: Windows XP SP3
Location: leiden,Netherlands
Contact:

Re: Outside Relative Humidity on WH1080

Post by hans » Wed 11 Mar 2009 8:25 pm

i have done the mod with the ferriet antenna.(did have a good reception though)
at first i only wanted to drill some extra holes in the outside housing.(also on the top for better airflow).
for my RH didn,t got above 89%
i didn't wanted to drill in the pcb,which is very likely so i decided to open the unit.
this was also an opportunity to do the antenna mod.
mine was shuffed underneith the pcb in a weird angle,which could have influenced the humidity sensor,or even caused a shortcut,which is very possible when its damp.
now it gets to 98%,and cumulus is set to read 98 as 100%.
very simple double mod,only takes about 15 minutes and gave big improvement.
i do have to mention that over the original stevenson screen i placed a homebuild one with a ventilator in it.
that also made an improvement.

sdsi
Posts: 9
Joined: Tue 10 Mar 2009 11:05 am

Re: Outside Relative Humidity on WH1080

Post by sdsi » Wed 11 Mar 2009 9:15 pm

I've just made the mod with the antena. Now I'm testing... :)

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beteljuice
Posts: 2516
Joined: Tue 09 Dec 2008 1:37 pm
Weather Station: None !
Operating System: XP SP3 - honest
Location: Dudley, West Midlands, UK

Re: Outside Relative Humidity on WH1080

Post by beteljuice » Wed 11 Mar 2009 11:03 pm

Thanks for the feed-back Hans :)
Image
......................Imagine, what you will KNOW tomorrow !

sdsi
Posts: 9
Joined: Tue 10 Mar 2009 11:05 am

Re: Outside Relative Humidity on WH1080

Post by sdsi » Thu 12 Mar 2009 5:53 am

after I've made this mod - I can NOT see any differences with humidity values... :(

taddeus
Posts: 38
Joined: Mon 19 Jan 2009 7:31 pm
Weather Station: PCE FWS20 (Fine Offset WH 1080)
Location: San Martino Siccomario - Italy

Re: Outside Relative Humidity on WH1080

Post by taddeus » Mon 23 Mar 2009 8:43 am

Mod on antenna done, now I'll see what happens ;)

Ciao.

Stefano

taddeus
Posts: 38
Joined: Mon 19 Jan 2009 7:31 pm
Weather Station: PCE FWS20 (Fine Offset WH 1080)
Location: San Martino Siccomario - Italy

Re: Outside Relative Humidity on WH1080

Post by taddeus » Thu 26 Mar 2009 9:27 am

At the moment the observations seem to be reliable, but the problem occurred predominantly with high values of humidity, currently low.

Regards.

Stefano

taddeus
Posts: 38
Joined: Mon 19 Jan 2009 7:31 pm
Weather Station: PCE FWS20 (Fine Offset WH 1080)
Location: San Martino Siccomario - Italy

Re: Outside Relative Humidity on WH1080

Post by taddeus » Sun 29 Mar 2009 7:00 pm

No way for high values of humidity :evil: ; next step: additional potentiometer.
Bye.

Stefano

taddeus
Posts: 38
Joined: Mon 19 Jan 2009 7:31 pm
Weather Station: PCE FWS20 (Fine Offset WH 1080)
Location: San Martino Siccomario - Italy

Re: Outside Relative Humidity on WH1080

Post by taddeus » Sun 05 Apr 2009 12:52 pm

My solution, on testing.

Bye
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MarkB
Posts: 68
Joined: Tue 13 Jan 2009 4:03 pm
Weather Station: Elecsa 6975 (Fine Offset)
Contact:

Re: Outside Relative Humidity on WH1080

Post by MarkB » Sun 05 Apr 2009 2:32 pm

Is that a linear or a logarithmic potentiometer?
What is the approximate position of the wiper?

Mark
Image

taddeus
Posts: 38
Joined: Mon 19 Jan 2009 7:31 pm
Weather Station: PCE FWS20 (Fine Offset WH 1080)
Location: San Martino Siccomario - Italy

Re: Outside Relative Humidity on WH1080

Post by taddeus » Sun 05 Apr 2009 2:53 pm

Is a linear potentiometer, (with a 5.8 MOhm resistor the correction was too strong, so I've tried a greater resistance across the sensor pins).
With the ohmmeter, the resistance of the potentiomenter is about 8MOhm, so,the total resistance is about 14MOhm.
Now I'm testing.

Have a nice sunday.

Stefano

sdsi
Posts: 9
Joined: Tue 10 Mar 2009 11:05 am

Re: Outside Relative Humidity on WH1080

Post by sdsi » Mon 06 Apr 2009 3:47 pm

Can you take a photo and publish here? Thanks :)

taddeus
Posts: 38
Joined: Mon 19 Jan 2009 7:31 pm
Weather Station: PCE FWS20 (Fine Offset WH 1080)
Location: San Martino Siccomario - Italy

Re: Outside Relative Humidity on WH1080

Post by taddeus » Mon 06 Apr 2009 9:18 pm

At the moment I haven't photos.
Care...my solder is too warm for that printed circuit, resulting in little damages (printed circuit damaged where the sensor is soldered). In the first stage I've soldered two thin wires over the printed circuit , the resistor with the potentiometer (flying) and the two wires from the pcb to the potentiometer and the resistor.

Enjoy :D

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MarkB
Posts: 68
Joined: Tue 13 Jan 2009 4:03 pm
Weather Station: Elecsa 6975 (Fine Offset)
Contact:

Re: Outside Relative Humidity on WH1080

Post by MarkB » Mon 06 Apr 2009 10:28 pm

thin solder :!:
the thinner the better!
:D
Image

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