[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

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

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

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

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 hol...@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

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

Hi Mark I have been running an older Davis VantagePro station for the last fifteen years. It gives either miles per hour or meters per second. Air pressure in either inches or millimeters of Mercury as well as hectoPascals One note - wind direction is opposite from what you might think. A

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

Beaufort scale Mark I think wind speed is also in Bueforts. Pretty sure thats misspelled. Regards ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to

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

I have a crappy Chinese-made handheld propeller anemometer. I'm not in Europe but FWIW the output can be selected as: m/s, km/h, ft/min, knots or mph. So, the first two of those seem to be likely metric choices. Your method sounds interesting. Would you be willing to share any details about

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

The project sounds like a fun hack -- I would be curious as to the resolution you achieve with these modules.--- The best description on the net about building a sonic anemometer is one by Hardy Lau:http://www.technik.dhbw-ravensburg.de/~lau/ultrasonic-anemometer.html I have also built one

Re: [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

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

On Saturday, May 24, 2014, David J Taylor david-tay...@blueyonder.co.uk wrote: 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/

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

On Sat, 24 May 2014 01:16:32 +, Mark Sims wrote: 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/?). Our weather

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

There is a great sonic anemometer in: An inexpensive sonic anemometer for eddy correlation G.S.Campbell and M.H.Unsworth, (1979), Journal of Applied Meteorology Vol 18, August 1979, Pp. 1072-1077. This unit uses 4000 CMOS, a LM301A and two cheap ultrasonic transducers. It operates a