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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 .

Step 1: Materials


for this inscrutable you will need :
-computer fan
-230v cable (without grounding)
-multimeter

Step 2: Changes on the 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 of the cable the computer fan's red wire to the blue one and the black one to the brown.

Step 3: Calibration

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 ) hold the multimeter.
when you reach the 10km/h ask he/she  what is the multimeter shows. here is my result:
10=1v
20=2v
30=3v
40=4v

but its deepens on the fan so check it!

Step 4: Placing

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 on the multimeter. you can replace the multimeter  whit an led  or anything the choose is yours.



bye!!
This is actually a really good idea! I might need to try this...
add a trimmer in series with the fan to limit the voltage for calliberation

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