Anemometer

An anemometer measures wind speed. The wind moves the cups on the anemometer which rotates an enclosed magnet. The magnet closes a reed switch on each rotation which is reflected on the output. You can measure this on the two inner conductors of the RJ11 connector (pins 2 and 3) using a digital counter or interrupt pins on your microcontroller. To convert this into a functional wind speed use the conversion of 1.492 mph = 1 switch closure/second. For those in metric land this is 2.4 km/h.This is the same anemometer that is used with the Weather Meter Kit.