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