HUmidity sensor

I would like to design a datalogger with a temp & humidity sensor. I
would like to make the whole thing compact and self contained but never
the less accurate. Any pointers ? 

Thanks
G

Giorgis wrote:
> I would like to design a datalogger with a temp & humidity sensor. I
> would like to make the whole thing compact and self contained but never
> the less accurate. Any pointers ? 

That depends on what you want in terms of accuracy, response time,
etc.

The classic approach to doing this is "chilled mirror".

You can also pick up some capacitance-based sensors though I
don't think you will get the same sort of accuracy.  And,
there's some tricky math involved converting to the various
different types of "moisture" measurements (you didn't say
*what* measure of humidity you are interested in)

Don wrote:

> You can also pick up some capacitance-based sensors though I
> don't think you will get the same sort of accuracy.  And,

Are there not sensors based on "biabsorptive strips"? (At least, I
don't know what else to call them). They are two strips of some fibrous
material glued together and wound in a spiral, just like a bimetallic
strip only sensitive to humidity rather than temperature.

Google for "Sensirion"

Regards
Ulrich Bangert

"Giorgis" <giorgis.3erolas@gmail.com> schrieb im Newsbeitrag
news:1160431399.532373.104050@e3g2000cwe.googlegroups.com...
> I would like to design a datalogger with a temp & humidity sensor. I
> would like to make the whole thing compact and self contained but never
> the less accurate. Any pointers ?
>
> Thanks
> G
>

> "Giorgis" <giorgis.3erolas@gmail.com> schrieb im Newsbeitrag
> news:1160431399.532373.104050@e3g2000cwe.googlegroups.com...
> 
>>I would like to design a datalogger with a temp & humidity sensor. I
>>would like to make the whole thing compact and self contained but never
>>the less accurate. Any pointers ?
>>
>>Thanks
>>G
>>
Ulrich Bangert wrote:
> Google for "Sensirion"
> 
> Regards
> Ulrich Bangert

Another vote for Sensirion <http://www.sensirion.com/>.

The things are small and give direct digital
output. It needs some calculations, though.

The interface is nearly I2C but not exactly.

I'm using SHT-11's.

-- 

Tauno Voipio
tauno voipio (at) iki fi

"Giorgis" <giorgis.3erolas@gmail.com> wrote in message 
news:1160431399.532373.104050@e3g2000cwe.googlegroups.com...
>I would like to design a datalogger with a temp & humidity sensor. I
> would like to make the whole thing compact and self contained but 
> never
> the less accurate. Any pointers ?
>
> Thanks
> G

Place an egg cup on your window sill. If the egg cup is wet then it is 
raining. For additional accuracy draw horizontal lines on the egg cup.

HTH 

"Tom Lucas" <news@REMOVE_auto_THIS_flame_TO_REPLY.clara.co.uk> wrote in
message news:1160470546.76361.0@iris.uk.clara.net...
> Place an egg cup on your window sill. If the egg cup is wet then it is
> raining. For additional accuracy draw horizontal lines on the egg cup.


Mmm.... a humidity sensor with built-in integration...

Meindert

<snipp>
 > Place an egg cup on your window sill. If the egg cup is wet then it
is
> > raining. For additional accuracy draw horizontal lines on the egg cup.
>
> Mmm.... a humidity sensor with built-in integration...
>
> Meindert


Do I need to include the window sill in my embeded device ?

Thanks guys, 
Good pointers ... a googling I shall go ...

G