DIY数字风速计
If you are a sailor, fly a kite or model aeroplane, or just like knowing the weather around you, this anemometer project is for you. The design would also be very useful in the geography or science departments of a school. For those who don’t know, an anemometer is simply a device that measures wind speed. Our battery-operated anemometer has a digital screen that shows wind speeds up to 99 km/h (higher if you wish to spend a little more), can display wind speed in either km/h or mph, has an in-built service indicator, and is very durable. But the most amazing thing is that building the complete anemometer should cost well under AUD$35!
The Design
The design uses a cup-type spinning assembly that is rotated by the wind. A magnet positioned on one of the four cup arms triggers a reed switch as it passes, with the output of the reed switch monitored by a combined LCD display/processor unit. The LCD/processor unit is available for incredibly little – you just buy a digital bicycle speedo. These can now be picked up for under $10!
While that’s the electronics out of the way in one fell swoop, the mechanical design is very important if the anemometer is to be both durable and reliable. A lot of effort was put into devising a rotor that would last a long time while being exposed full-time to the elements. Our final design uses stainless steel cups, polypropylene arms, and a dual ball bearing axle.
Sounds expensive and difficult to source? Not really – the axle assembly is the front hub of a bicycle, the stainless steel cups are soup ladles, and the polypropylene is a plastic kitchen chopping board!
Building It
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