[time-nuts] Weather/units question for European members

David J Taylor david-taylor at blueyonder.co.uk
Sat May 24 00:21:45 EDT 2014


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: david-taylor at blueyonder.co.uk 




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