RE: [misterhouse-users] Re: Snow Detector

[Gray, T. <Tim...@ca...>]

the only problem with a weight sensor is that wind will change it's
readings.  Snow is very very light, or very heavy depending on it's moisture
content. and a plate large enough to weigh it without spending lots of money
on the sensor will increase the overall effect that the wind will have on
it.

If you can shield it from the wind, (a box around it) this will help.

as for the heated plate, I just simply have the software compare the outside
temperature with what it is detecting.  If the temp is <32F (0C) then it is
detecting snow or ice <30F -1C it is snow without a doubt.

I am interested in seeing how a weighing plate will work though.

-----Original Message-----
From: bazyle butcher [mailto:baz...@nt...]
Sent: Monday, February 03, 2003 7:28 PM
To: mis...@li...
Subject: [misterhouse-users] Re: Snow Detector


Thanks for the ideas. I think the heated platten, as used by some commercial
devices, is better suited to places where it's snow or nothing as it also
triggers on dew or fine rain which is normal here.  However a heated rain
guage, compared perhaps to a non heated one, is  a possibility.
The best option seems to be Scott's weighing machine with rain permeable
mesh collector which can be enlarged until it is sensitive enough, perhaps
with an option of subsequently heating and diverting the water into a rain
guage. I will look into strain/pressure sensors but probably the simplest is
a gravity balance and proportional optical sensor of some sort  feeding my
analogue Weeder.
Baz



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