Ultrasonic techniques replace mechanics and calibration.

This PIC-based wind speed meter (anemometer) is intended for use in a variety of sports-type activities, such as track events, sailing, hang-gliding, kite and model aircraft flying, to name but a few. It can even be used to monitor the conditions in your garden.

A probe is pointed in the direction from which the wind is blowing and a screen displays the rate at which the wind is moving between two ultrasonic sensors. The readout is shown on an alphanumeric liquid crystal display (LCD), with readings in meters per second, feet per second, kilometers per hour and miles per hour. The resolution is to the nearest tenth of a meter per second, from zero up to around 50mph, and possibly higher.