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

paul swed paulswedb at gmail.com
Fri May 23 21:36:58 EDT 2014


Mark
I think wind speed is also in Bueforts. Pretty sure thats misspelled.
Regards


On Fri, May 23, 2014 at 9:16 PM, Mark Sims <holrum at hotmail.com> 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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