This is a different take where the author uses IR sensors to figure out wind speed.
http://www.instructables.com/id/DIY-Anemometer-and-Windvane-for-Standalone-Weather/?ALLSTEPS
This is a different take where the author uses IR sensors to figure out wind speed.
http://www.instructables.com/id/DIY-Anemometer-and-Windvane-for-Standalone-Weather/?ALLSTEPS