Post by thread:[OT] Weather Stations and Meteorological Info Upda

I have received some private e-mail about meteorological calculations and other info so I updated my `pathetic' little web site with a variety of links which include: - Common Meteorological Calculations - The Weather Calculator - Calculate Weather On-Line - Federal Meteorological Handbook No. 1 - Surface Weather Observations and Reports - National Oceanic and Atmospheric Administration (NOAA) - National Weather Service (NWS) - American Meteorological Society (AMS) - World Meteorological Organization (WMO) - AccuWeather - Weather Forecasts, RADAR Data, and Satellite Imagery from Around the World - The Weather Underground - Forecasts, Maps, RADAR, Satellite, Weather Cams, and Software - UM Weather - Forecasts, Maps, RADAR, Satellite, Weather Cams, and Software - Davis Instruments Weather Stations - Peet Bros. Weather Stations - Fascinating Electronics Weather Stations and Kits - Build Dallas Semiconductor's Weather Station based on their 1-Wire Interface - Build a Weather Station using the PIC or BASIC Stamp. By Peter Anderson - Build The WeatherStamp Meteorological Station Kit - Build an Anemometer For more info: http://www.teleport.com/~thandley/Wilbure.htm - Tom ------------------------------------------------------------------------ Tom Handley New Age Communications Since '75 before "New Age" and no one around here is waiting for UFOs ;-)

ok, how the &Û%&Û% does it tell what direction the wind is comming from ? >From the rotation of the 'wind-wheel' it can only determine windspeed, not direction ?!? (north/west/south/east and so on) > - Build a Weather Station using the PIC or BASIC Stamp. By Peter Anderson > - Build The WeatherStamp Meteorological Station Kit > - Build an Anemometer > > For more info: > > http://www.teleport.com/~thandley/Wilbure.htm > > Tom Handley

Yes, you can. In real, the rotating sensor is made of 3 or 4 arms and cups. If the rotator generates one pulse per arm, and if one of the cups is bigger than the others, you can measure a small time difference between pulses, the time from certain pulse to another will be short, this happens when the bigger cup is being pushed by the wind. If you install another sensor (one pulse per revolution) in the rotator that identify a know position (home position), it would be easy to identify in percentage (from 0 to 100% of a complete rotor revolution), so the direction of the wind with great accuracy. The only problem is that the rotator would vibrate, as out of balance, extra adjustments with weights could be necessary. Patrick J wrote: > > ok, how the &Û%&Û% does it tell what direction the wind is comming from ? > >From the rotation of the 'wind-wheel' it can only determine windspeed, > not direction ?!? (north/west/south/east and so on)

Wagner Lipnharski wrote: > If you install another sensor (one pulse per revolution) in the > rotator that identify a know position (home position), No, you only need one sensor. The "chopper" blade is longer for one of the cups so the processor can figure out which cup is which. -- Cheers, Paul B.

Yup, you mean one slot aperture is wider, so the processor would know when the larger cup is crossing the sensor... works. The longer pulse means home position, the shorter period between pulses would say when the big cup is facing the wind. The angular position between them would tell the wind angle related to the sensor physical position. "Paul B. Webster VK2BZC" wrote: {Quote hidden}> > Wagner Lipnharski wrote: > > > If you install another sensor (one pulse per revolution) in the > > rotator that identify a know position (home position), > > No, you only need one sensor. The "chopper" blade is longer for one > of the cups so the processor can figure out which cup is which. > -- > Cheers, > Paul B.