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 .

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Step 1: Materials

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

Step 2: Changes on the multimeter

Picture of 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:

but its deepens on the fan so check it!
tylervitale3 years ago
This is actually a really good idea! I might need to try this...
yaly3 years ago
add a trimmer in series with the fan to limit the voltage for calliberation
erenjay3 years ago
Awesome :)