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Counting device

  • US 4,054,779 A
  • Filed: 07/19/1976
  • Issued: 10/18/1977
  • Est. Priority Date: 07/19/1976
  • Status: Expired due to Term
First Claim
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1. A seed montior for a multiple station planter including a light source adjacent the seed path for each planter station, a pair of spaced light responsive devices in alignment with each light source,means for causing operation of each light source, a pair of pulse generating means, each pulse generating means being connected to one of each pair of light responsive devices for providing a constant width pulse in response to an interruption in light received from the light source, and logic circuit means connected to each pulse generating means, said logic circuit means providing an output signal whenever either pulse generating means provides a pulse at its input.

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