Development of Hall sensor propeller anemometer for measuring wind speed using embedded controller

An Anemometer is a device for measuring wind speed. Propeller type anemometer measures wind speed by generating an a.c signal. In the development of new anemometer, we use Hall Effect sensor to generate digital signal. The voltage levels of the digital signal depends on the input voltage applied to the Hall sensor, its input voltage may be from 2.5V - 27V. The Timer/Counter is a register in the Microcontroller, whose value keeps increasing or decreasing for rising edge or falling edge of the internal or external clock source by a constant rate without the help of CPU. The external clock to the counter is the digital signal from the Hall sensor. Thus the rate of rotations made by the propeller is counted using counter in the PIC 18F series Microcontroller. The spinning rate of the propeller is proportional to the wind speed. Therefore, we can determine the wind speed from the measurement of spinning rate of the propeller using embedded controller and the radius of propeller. The performance of our system is compared with existing system and our designed anemometer is also inexpensive.