It can be connected to produce a varying frequency output, whose frequency 0 - 100Hz corresponds to windspeeds of 0 - 40m/s. The anemometer contains a reed switch with rotating magnets which produce two switch closures per revolution of the cup assembly. It uses an inexpensive cup anemometer from Biral (see photo, left) available here in the UK. This wind logger project was designed to help a friend who wants to log wind speed for one year.
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