Wind speed sensor is really similar to water speed sensor.
Vincenzo Emanuele Castellano's blog
To measure speed we will use an Aimar ST650 connected to an Arduino.
The Aimar ST650 has a paddleweel with four asymmetrical, hydrodynamic blades and hall-effect magnetic sensor for high-level pulse output.
Connecting ST650 to an Arduino Board:
- Bare cable to GND.
- Red cable to +5V.
- Green cable to pin A0.
This first basilar sketch will count paddlewheel’s complete rotations: