[time-nuts] Weather/units question for European members
arnold.tibus at gmx.de
Sat May 24 10:40:55 UTC 2014
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.
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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