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

Arnold Tibus arnold.tibus at gmx.de
Sat May 24 06:40:55 EDT 2014


Hi Mark,

I second Paul Henning,
here in Europe we use officially the SI standard, does mean m/s and hPa!

Privately used other units are another thing like km/h or units Beaufort
and mb (millibar),
but not official. If possible use always the international SI units and
as personal choice km/h,
hPa and millibar are anyway same numbers.
Regards
Arnold

Am 24.05.2014 03:16, schrieb Mark Sims:
> 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 wbbithout 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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