Wind direction sensor

The utility model discloses a wind direction sensor, it includes shell, wind vane, wind direction axle, wind direction code wheel device and wind direction circuit arrangement, the outer wall mask ofshell has along a zero scale line of vertical orientation extension. The wind vane includes the wind direction gauge rod. The axipetal axis of wind is perpendicular with the axis of wind direction gauge rod. Wind direction code wheel device is fixed in the center of gray code wheel including the gray code wheel that has light transmissive portion and shading part, the axipetal second of wind end,and the gray code wheel has a zero -base directrix, and the axis of wind direction gauge rod is parallel with zero -base directrix. Wind direction circuit arrangement includes circuit board, a plurality of parallelly connected infrared light emitting diode and a plurality of parallelly connected infrared reception diode. When the instruction orientation of wind direction indicateing arm was the zero degree, the zero -base