I have a crappy Chinese-made handheld propeller anemometer. I'm not in
Europe but FWIW the output can be selected as: m/s, km/h, ft/min, knots
or mph. So, the first two of those seem to be likely metric choices.
Your method sounds interesting. Would you be willing to share any
details about how you are using the ultrasonic modules? Do they just
point out into open space or is there something more involved? Was
there a reference that got you started on this idea?
On 5/23/2014 6:16 PM, 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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