Nice!Burngate wrote:You could always try for a non-mechanical one - ultrasonic transmitter and three receivers, measure the delays to work out wind speed and direction
Sonic anemometers are not a new technology (several decades). Many companies make them including the company I work for. http://www.metone.com/Burngate wrote:That's the one!VENTS wrote:Hi,
You can see that ultrasonic anemometer :
Actually it was a long time ago that I saw an article about it, so LCJ Capteurs may have commercialised it in the mean time.
Solid state, no moving parts, brilliant.
Ooh, that's rather clever … a cheaper variant on the hot wire anemometer.pumpkinpi wrote:Has anybody tried interfacing this anemometer to the Pi?
Not had that much experience with ADC on the Raspberry Pi. Something like the Microchip MCP3424 might do, as used in the ADC Pi board. I don't know if you can configure it for differential inputs. You'll need a separate power supply for the sensor than the Raspberry Pi.pumpkinpi wrote:Not having used an analog to digital converter, what would work with the Pi?
Maybe my comment came across as dismissive; I'm sorry if it did. My experience is in anemometry for wind power in northern climates: if it can crack, freeze, get struck by lightning, shot at, get gummed up with bird poop/nesting bees, invaded by ants or generally go south in amusing and expensive-to-replace ways, I've seen it happen. I guess if you enclosed it carefully (potted it?) and recalibrated it regularly, it would work well. Its non-linear output and upper limit of ~19 m/s are the main issues for me. You'd likely never see 19 m/s in a domestic location, but old habits die hard.The technology is well known. I have been buying this type of instrument for 15+ years for use in industrial plants to measure air flow. Why do you feel it would not last long outside? It just needs an appropriately designed enclosure. My feeling is that one with moving parts is more likely to fail.
Hmm, not bad. Mil-spec connector means it's probably for boating. 0.4 to 2 V output looks suspiciously like it's a 4–20 mA current loop device internally, dropped through a 100 Ω resistor. I ♥ current loop devices, but they use lots of power …pumpkinpi wrote:This is one option:
Looks good on screen.
One option for the wind speed indicatorsquarepie wrote:I'm building a raspberry pi weather station. Does anyone know how to make an anemometer? The only premade ones I can find online are handheld ones which are pretty useless for my project. Also I am interfacing it through i2c and Dallas 1 wire.
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