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[wxsig] wxsig Digest, Vol 46, Issue 1

John Bennett jabennett at insightbb.com
Sat Jan 24 17:02:49 UTC 2009

Hi Bob,

Thanks for the note. The first significant amount of frozen precip may
come this next week. We did have about an inch of snow recently, but due
to a temperature variance once it falls below freezing the results were
not conclusive. I have some ideas on how to sort this out. I just need
the time - which I do not really have right now. I am the Chief Engineer
of a local television station and am pretty covered up between the
digital transition, the Sprint-Nextel 2GHz relocation project and the
fact we have to move to a new location by year's end. The manufacturer,
will soon have a new transducer that would be better suited for snow
measurement, so that is another consideration.

Your garage project sounds interesting. Using the MaxBotix EZ1 (same
sensor I am using in the snow depth sensor) and a comparator on the
analog output you could probably come up with a solution in an hour or

Thanks for the info. I will take a look.



On Sun, 2009-01-18 at 09:37 -0600, Bob Stricklin wrote:
> John,
> Have a look at http://www.edpcompany.com/sonaindex.html.
> This company makes ultrasonic sensors and is probably after
> automotive related applications mostly.
> Tanners is an electronic surplus dealer in Farmers Branch, the Dallas 
> area. They had some of the sensors like the one shown at the url given. 
> I purchased one of them and had planed to use it to monitor the water 
> level in a cattle watering tub. Still on my ToDo list though. I also 
> thought I may be able to get a different signal when the water freezes. 
> When ice forms I could turn on a heater. Cows drink about 40 gallons of 
> water per day each so I have to keep an avilable water source.
> As I recall the cost was about $12 to $20. The range is stated to be 6 
> to 10 inches but other models are available. Tanners does not do mail 
> order. However if you are interested I could try to get one for you and 
> mail it to you. Tanners typically has a limited inventory of items like 
> this and when they are gone there gone. I purchased the one I have about 
> a year ago. You may also want to talk with the manufacture.
> Another application I have wanted to tackel is to place one of these on 
> my garage wall and turn on an LED when my car was at the ideal park 
> location.
> I think your application is a good one and interesting. You may be able 
> to get different signatures of sound for different types of snow. You 
> may also be able to see it snowing with ultrasonics. The resolution of 
> the ultrasonic system design will drive the capabilty to do these things.
> 73, Bob N5BRG
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