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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