How can I make anemometers at home?

To make an anemometer at home, you will need four small cups, a straw, a pencil, a pin, and a ruler. Attach the cups to the ends of the straw, then insert the pin through the straw and into the eraser of the pencil. Place the pencil upright in a stable base. When the wind spins the cups, count the number of rotations in a set time to measure wind speed.