Patent ID: 8618465

Claim:
A seed sensor assembly for detecting the passage of a seed through a seed tube, the seed tube having front and rear walls spaced apart in a travel direction and spaced side walls extending between the front and rear walls, the sensor assembly comprising: a first radiation emitter on one side wall of the seed tube; a first array of radiation detecting elements along the opposite side wall from the radiation emitter and extending from the front wall to the rear wall of the seed tube to determine a position of a seed passing the first array relative to the seed tube in the travel direction; a second radiation emitter on one side wall of the seed tube spaced from the first radiation emitter in a direction of seed travel through the tube; and a second array of radiation detecting elements along the opposite side wall from the second radiation emitter and extending from the front wall to the rear wall of the seed tube and spaced from the first array of radiation detecting elements in the direction of seed travel through the tube to determine a position of a seed passing the second array relative to the seed tube in the travel direction.