Anemometer

You will also need:

• 2x 604 ZZ bearings,
• M4 x 40 bolt,
• 2x M4 x 0.7 nuts

So far I tried to measure rotations with optical sensor but did not turn out well. I will try with reed switch in the future.

Note: I printed with supports (one of my first prints) but I think it could be printed without.