Hi Mark:
The key benefit of an ultrasonic wind speed/direction sensor is that it can
detect very slow wind speeds.
My Peet Bros. system does not start telling me anything until the speed is a
few MPH.
http://www.prc68.com/I/UltimeterWeatherStation.shtml
But all the weather stations I've seen don't tell you if the wind is backing or
veering and how fast that's going on.
This is critical for forecasting.
It would be possible to have a graphical display the would be like looking down on a smoke stack with the smoke trail
showing the history of wind direction.
See the Sager Weather Caster book for more on that.
http://www.prc68.com/I/Weather.shtml
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Mark Sims wrote:
I am building a weather sensor that includes a ultrasonic anemometer to measure
wind speed, direction, and air temperature. It uses 4 cheap ($1 each) HC-SR04
ultrasonic rangefinder modules that output a pulse width proportional to the
time of flight of the sound signal (topic is time nut related since it
simultaneously measures the speed of sound in 4 directions to a pretty good
accuracy/resolution using a cheap-ass microprocessor - ATMEGA328 (like and
Arduino)... and does so without using any counter-timer channels).
Now the question... I would like it to be able to output data in imperial or
metric units. In what units is the typical wind speed reported (meters/sec,
km/hour, ?). Also air pressure (millibars/hectopascals/pascals/?).
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