A mostly 3D printed wind vane is printed with the base attached to a ball bearing and magnet so that the four hall sensors positioned in a “plus” configuration at the base can detect direction.

A wind vane is actually an example of a good sensor giving ‘noisy’ readings: not that the sensor itself is noisy, but that wind is inherently gusty and is constantly changing direction.

By adopting a sensor that uses ultrasonic waves, an additional module for the 'Netatmo Weather Station ' anemometer, which can measure wind speed and direction continuously and without maintenance ...

The original Vaavud was a wind meter that required no power and plugged into your smartphone's 3.5mm stereo input jack, but that actually transmitted information to the device via high-frequency ...