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

Javier Herrero jherrero at hvsistemas.es
Sat May 24 12:01:53 UTC 2014


Wind speed usually in meters/sec (when used for scientific data) or km/h 
(used in the news, so the people can compare with car speed ;) )
Pressure in millibars. Meteorologist also usually refers to 
hectopascals, but it is more for representing something at a given 
altitude (for example, winds at 700hPa) than for managing pressure data.
Temperature in ºC
Precipitation in liters/squared meter or millimeters (it is a 1:1 

Best regards,


On 24/05/2014 3:16, Mark Sims wrote:
> 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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