Re: Outside Relative Humidity on WH1080
Posted: Wed 11 Mar 2009 12:09 pm
Good 
thanks. good idea.
sombedy who has got WH1081 (model without ferrite rod aerial) can write about values from humdity sensor...?
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Support forum for Cumulus weather station software
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Outside Relative Humidity on WH1080
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Re: Outside Relative Humidity on WH1080
Posted: Wed 11 Mar 2009 12:15 pm
Re: Outside Relative Humidity on WH1080
Posted: 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.
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.
Re: Outside Relative Humidity on WH1080
Posted: Wed 11 Mar 2009 9:15 pm
I've just made the mod with the antena. Now I'm testing...
Re: Outside Relative Humidity on WH1080
Posted: Wed 11 Mar 2009 11:03 pm
Thanks for the feed-back Hans
Re: Outside Relative Humidity on WH1080
Posted: Thu 12 Mar 2009 5:53 am
after I've made this mod - I can NOT see any differences with humidity values... 
Re: Outside Relative Humidity on WH1080
Posted: Mon 23 Mar 2009 8:43 am
Mod on antenna done, now I'll see what happens 
Ciao.
Stefano
Ciao.
Stefano
Re: Outside Relative Humidity on WH1080
Posted: 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
Regards.
Stefano
Re: Outside Relative Humidity on WH1080
Posted: Sun 29 Mar 2009 7:00 pm
No way for high values of humidity 
; next step: additional potentiometer.
Bye.
Stefano
; next step: additional potentiometer.Bye.
Stefano
Re: Outside Relative Humidity on WH1080
Posted: Sun 05 Apr 2009 12:52 pm
My solution, on testing.
Bye
Bye
Re: Outside Relative Humidity on WH1080
Posted: Sun 05 Apr 2009 2:32 pm
Is that a linear or a logarithmic potentiometer?
What is the approximate position of the wiper?
Mark
What is the approximate position of the wiper?
Mark
Re: Outside Relative Humidity on WH1080
Posted: 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
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
Re: Outside Relative Humidity on WH1080
Posted: Mon 06 Apr 2009 3:47 pm
Can you take a photo and publish here? Thanks
Re: Outside Relative Humidity on WH1080
Posted: 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
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
Re: Outside Relative Humidity on WH1080
Posted: Mon 06 Apr 2009 10:28 pm
thin solder 
the thinner the better!
the thinner the better!