Planning on building a small anemometer and open sourcing as much of it as possible. A small bering holding a rotator and a magnet with a reed switch is how im planning on measuring the rotations. Then it will be hard wired from there to a base station with an old raspberry pi that i have and a small display for recent data. Ill need to update the pi if i want wifi so i can stream data to a server constantly but this seems like a good start, upgrades can be made later.