Aerometer - Windmesser - Sensor
thingiverse
You need to print the wings 3x but be carefull the top of the round sphere are a little bit tricky everything can then be mountet on a 8 or 10 mm rod the ball-bearing you need is a standart 20*37*9mm for the mesurement you need a normal hall sensor (with digital output) and a magnet that fits in the hole (d=10mm h=2mm)
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