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

Tom Miller tmiller11147 at verizon.net
Sat May 24 01:30:17 UTC 2014

For civilian use, Miles/hour and inches Hg. Aviation and marine would be 
knots and inches Hg.


----- Original Message ----- 
From: "Mark Sims" <holrum at hotmail.com>
To: <time-nuts at febo.com>
Sent: Friday, May 23, 2014 9:16 PM
Subject: [time-nuts] Weather/units question for European members

>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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