hand-held anemometer

20 elektor electronics october 1985 Anemometers are in steady demand by yachtsmen, wind surfers, glider pilots, and amateur meteorologists, to name but a few. The digital anemometer presented here can be built for about half the price of commercially available mechanical versions. An anemometer is a device for measuring the velocity of, among others, air move- ment, i.e., wind. Its transducer (also called sensor), i.e., the device that converts the wind speed into electrical signals, is usually driven by a small windmill, or a set of cups. The latter is used in the pres- ent design - Fig. 8. The sensor, at the left in Fig. 1, generates sixteen pulses for every rotation of the set of cups. These pulses, taken over a time hand-held anemometer by M Huch determined by the control, are added in a counter. At the end of each counting period, the counter reading is applied to an EPROM; the output data of the EPROM are stored in a display driver. For every counter position, the EPROM ha...