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/?).
==============================================
Mark,
m/s and hPa are often used, but not exclusively.
Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: [email protected]
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