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Forum Index : Electronics : Interesting wind meter circuit
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Chris Senior Member  Joined: 12/09/2005 Location: AustraliaPosts: 146 |
Well i was on discover circuits and stumbled across this... Uses two transistors to measure wind speed... http://www3.telus.net/chemelec/Projects/Anemometer/Schematic .png Heres the parent page... its quite interesting. http://www3.telus.net/chemelec/Projects/Anemometer/Anemomete r.htm |
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| KiwiJohn Guru  Joined: 01/12/2005 Location: New ZealandPosts: 691 |
I think a similar system is used in some cars to measure the air flow into the manifold. Maybe the sensors could be obtainable from junk yards? |
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| Chris Senior Member Joined: 12/09/2005 Location: AustraliaPosts: 146 |
I know some cars use a hot wire system, so as more air passes over a piece of wire, it cools it changing the resistance... Or something along these lines. But surely with a semiconductor it should be a bit more accurate i think... Might try build one later on. Anyone else got thoughts on this circuit? |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5012 |
I played around with hot wire sensors years ago. They work very well, if you pass a current through a wire so it starts to glow red, then blow on it, the current goes up! So by using a constant current source to keep the wire red hot, wind speed over the wire is proportional to the voltage needed to keep it hot. The down side is they need a few watts to run. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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makourain Senior Member Joined: 19/04/2006 Location: Posts: 111 |
chemelec is what got me in to windmills, but his wind speed meter cant read wind faster than 2 or 3 miles per hour. |
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| nando Newbie  Joined: 16/07/2006 Location: United StatesPosts: 3 |
What I have done with very low power was to use small 12 volts 100,000 hours lamps using two of them, one of them the glass is removed and the other is kept as it is . Two equal constant sources, feeding each lamp, then one measures the voltages differentially to get the wind velocity. Quite effective and as well, low power, some of those lamps needed around 20 to 30 milliamps, if I ever find my data, it is in storage, I will present it, though it was done in the middles 1960's. Nando |
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