Outside readings from the Inside
 

My virtually antique temperature reader with wire probe leading to the
ouside, (takes 2x AA's) that I have mounted on the wall of my living room,
has certainly seen nearly the best part of 30years. I bought it from the
sales shop at the London Weather Centre in the glory days of Jack Scott i
think when you could see the duty forecaster read out the weather at 5.55pm
from High Holborn. Anyone Remember that!
So i'm looking for something similar (these days we have radio control units
mounted outside) I don't want anything really sophisticated like everything
wind speed et al I noticed this -- anyone have any comments to make?
http://www.weather-station-products....ail/WS8035.jpg
DaveR west London

Outside readings from the Inside
 

"Dave R." wrote in message
...
My virtually antique temperature reader with wire probe leading to the
ouside, (takes 2x AA's) that I have mounted on the wall of my living room,
has certainly seen nearly the best part of 30years. I bought it from the
sales shop at the London Weather Centre in the glory days of Jack Scott i
think when you could see the duty forecaster read out the weather at
5.55pm from High Holborn. Anyone Remember that!
So i'm looking for something similar (these days we have radio control
units mounted outside) I don't want anything really sophisticated like
everything wind speed et al I noticed this -- anyone have any comments to
make?
http://www.weather-station-products....ail/WS8035.jpg
DaveR west London
---------------------
I've found most of the radio sensor ones to be pretty good and very cheap
now. If you only want temp and humidity Maplin's usually have one and the
Lidl's (Silvercrest) one is top notch when it's in.
Dave

Outside readings from the Inside
 

"Dave Cornwell" wrote in message
...
snip I've found most of the radio sensor ones to be pretty good and very
cheap
now. If you only want temp and humidity Maplin's usually have one and the
Lidl's (Silvercrest) one is top notch when it's in.
Dave

Just as a matter of interest, can someone explain to me how these humidity
sensors work? My LaCrosse one packed up some time ago, and I took it to
bits, but apart from the wireless gubbins there didn't seem to be much going
on inside.

Steve P

Outside readings from the Inside
 

On Mon, 12 Jan 2009 at 12:52:12, Steve Pardoe
wrote in uk.sci.weather :

"Dave Cornwell" wrote in message
...
snip I've found most of the radio sensor ones to be pretty good and very
cheap
now. If you only want temp and humidity Maplin's usually have one and the
Lidl's (Silvercrest) one is top notch when it's in.
Dave

Just as a matter of interest, can someone explain to me how these humidity
sensors work? My LaCrosse one packed up some time ago, and I took it to
bits, but apart from the wireless gubbins there didn't seem to be much going
on inside.

I don't know about that, but I've found them often to be inaccurate,
especially during high humidity situations.
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)

Outside readings from the Inside
 

On Mon, 12 Jan 2009 12:52:12 -0000, Steve Pardoe wrote:

Just as a matter of interest, can someone explain to me how these
humidity sensors work?

Googling about they appear to be capacitive, the capacitance of the device
varies with humidty in a known manner. Build an oscilator with the humidty
sensitive device in the control loop and the frequency of the oscilator
will vary in relation to the humidty. Then simply measure the frequency of
your oscilator to get the humidty reading.

http://www.directindustry.com/prod/e...ensor-for-mass
-applications-smd-component-13965-44881.html

http://www.rapidonline.com/Electroni...idity-Sensors/
Humidity-sensor/80511/kw/61-0984

http://www.rapidonline.com/Electroni...idity-Sensors/
Humidity-sensor/30168/kw/61-0960

--
Cheers
Dave.