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this inscrutable show how to make an wind speed meter. it's really easy so its won't need more than 5 minutes to make it .
for this inscrutable you will need : -computer fan -230v cable (without grounding) -multimeter
pull out the cables from the multimeter and insert the brown one to the "COM" and the blue one to the "V ohm mA". at the other end ...
ask someone to help whit the calibrating. put the fan on your bike and start riding whit 10 km/h the other people (in my case my sister ) ...
when you calibrate it put it into the window like on the picture . when the wind is blowing the fan will rotates and produce electricity that show ...
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