Ultrasonic wind sensor
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Hey there!
The following wind sensor caught my attention: http://www.aliexpress.com/item/200khz-high-precision-ultrasonic-wind-sensor-full-set-nu200e28tr-1-free-shipping/1647272580.html
I'm not familiar with the measurent principle for wind measurement and the seller's description isn't very helpful...
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Hmmm....
Seems more like a distance sensor. Anyone who has experience, using it for measuring wind speeds?
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Cool. The professional versions of this seems to be able to determine wind direction as well.
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Seems like someone has used a bad google translate thing to describe their product on alixpress
Googled teh nu200e28tr-1, and came up with this site http://www.nusensor.com/showgoods/841.html
It's actually a distance sensor, and not a wind sensor
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actually pretty cool method..
There is a report posted on arduino forum http://forum.arduino.cc/index.php/topic,53569.0.html, that describes the principles behind the measurements (There is a link to a zip file, which has a PDF file enclosed, with all the mathematics etc).
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I work since a few years with french based LCJ Ultrasonic anemometers which works quite well.
Output is NMEA based and i access them with the TinyGPSplus library. But not as MySensor node, because the update rate is 2Hz.
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It looks like it's just an ultrasonic transducer.
With multiple ultrasonic transducers one could create a wind speed and direction sensor. (If you measure N/S wind speed and E/W wind speed you can get total wind speed and direction).
The typical cheap distance measuring modules use very cheap 40KHz transducers; these operate at 200 KHz.
Wind speed can be measured by timing a pulse between two transducers. The pulse will arrive slightly sooner if the wind is blowing towards the receiver, slightly later if it's blowing the other way, but the differences are small so you have to compensate for other factors like temperature, perhaps air pressure and humidity.
With 4 transducers at over $200 even before all your analog circuitry to generate the high voltage drive and sensitive receiver, this is not going to be super cheap!
