Windmeter for Android

thingiverse

Here is my Android Windmeter in action. It relies on two small magnets connected to the anemometer axis and spinning above the smartphone's magnetometer. This produces a minimal fluctuation of the magnetic field, which can be converted into rotation speed using a fast Fourier transform. The App enables you to calibrate this speed with GPS data and display it on a gauge. Take a look at how it works: https://www.youtube.com/watch?v=jA16slSEuuM