For civilian use, Miles/hour and inches Hg. Aviation and marine would be
knots and inches Hg.
Tom
----- Original Message -----
From: "Mark Sims" <hol...@hotmail.com>
To: <time-nuts@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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