[time-nuts] Weather/units question for European members
Tom Miller
tmiller11147 at verizon.net
Fri May 23 21:30:17 EDT 2014
For civilian use, Miles/hour and inches Hg. Aviation and marine would be
knots and inches Hg.
Tom
----- 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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