[quote author=trevor link=topic=5565.msg95477#msg95477 date=1132685269]
Seems sensible except it doesn’t appear to work correctly with high humidity without adding heaters to the leaf sensor.
Hi meteofrog,
don’t you have a picture of your implementation of wetleave sensor heater.
Thanks.
Hi Clarence,
at the moment I dont have a picture for that, but it is a very simple modification:
a 12V heating foliage is put on a small metal plate (because the leaf wetness sensor is smaller than the foliage). Between the backside of the sensor and the other side of the metal plate you apply sparingly a thermally conductive paste for better thermal transmisson. Put all together with a little bit of silicone or screws. Thats it.
For transforming from 220V electricity to 12V a small transformer is in use.
By the time I will shoot a picture, but it will last a small time.
Note, that I am using a DAVIS leaf wetness sensor !
fixed with 10.30t
thanks
thanks for that good news!
meteofrog, did you mount you sensor flat (level with ground) or on an angle ?
i’ve got it flat, and after some drizzle and with the heater on, the sensor stays wet (15)
Cheers
Hi cyclone, mounting flat with ground level ist not a good idea!
I have it mounted on an angle (I think its about 45
ok, its on an angle now.
Now deciding if i should turn it off during the day, because it appears that the sensor is quite hot, and sometimes light drizzle is not detected, the one minute update from DAVIS does not help
try calibrating it better with adjusting the heater (I have installled a transformer which allows changing the voltage from 6 to 24 V)
by the way, my sensor is also a bit warm about 30-40
I love it it !!!
picks up drizzle upto 3 mins before VP says .2mm
http://www.gorgecreekorchards.com.au/flash.html
Very fine - that was my idea for that solution and it is also workign great for me.
only snowfall in kombination with wind is a bit difficult and in accurate, because the snowflakes are blown over the sensor.
I have to create a “windring” around the sensor in spring.
I’m just wondering :?
in “use leaf wetness from Davis VP to set icon”
should it be
x Leaf wetness to set moderate drizzle
x Leaf wetness to set light rain
what does everyone think ?
hi cyclone,
what do you mean exactely?
i’ve got the following
1 Leaf wetness to set light rain
15 Leaf wetness to set moderate rain
i think the words drizzle should be used for the first setting.
have a look here http://www.bom.gov.au/info/wwords/
there was some drizzle this morning but nothing on the rain guage have a look here in aqua
Hi cyclone,
I dont think that there would be a chance making a difference between drizzle and light rain.
Dont forget: the sensor is reacting, if there are poor waterdrops on the plate. that could be some raindrops or drizzle.
But if you do have a heating of that sensor you may only register light rain or some rain drops, drizzle would evaporate before registrated.
I don’t understand what you are trying to say
Its to my understanding it drizzles before it rains, oh well
Maybe my drizzle is different to your drizzle 8O 8O 8O
Drizzle this afternoon here - http://www.gorgecreekorchards.com.au/vprealtimegraph.gif nothing on the rain guage.
so for clearing my mind - there must be drizzle before having light rain? Is it that what you mean?
Actually this isn’t true. The sole difference between rain and drizzle is droplet size. Drizzle are droplets less than 500 microns and rain droplets are anything greater than that number.
Correct…but
we are talking about the use of the leaf wetness sensor, to predict precipitation.
During a thunderstorm, the leaf wetness sensor is useless because the rain gauge will tip almost immediately.
But during very light precipitation, the leaf wetness sensor acts as a drizzle sensor
yesterday, there was 10 instances of precipitation (drizzle) the leaf wetness sensor only went to 3 or 4 (out of 15) but the rain gauge measured 0 mm.
I dont think it is a basic problem (it doesnt matter if there is called drizzle or light rain in the settings page) unless you can change the name for rain thresholds in the settings by yourself.