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Last Updated on: Tuesday, June 01, 2021 03:06 PM

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Light Detectors or Optical Sensors



I designed a circuit similar to this one a long time ago to help a beekeeper count the number of bees going into or out of a hive. The low power circuit uses a slotted opto-sensor to detect the passing bees. The circuit advances an electronic counting module whenever a honeybee passes through the sensor. The device only counts the number of bees going through the sensor. A different circuit would be needed to count the number of bees only going out or only coming into the hive.

Click on Circuit Below to view PDF of Schematic

Honeybee Hive Traffic Counter , Circuit designed by David A. Johnson, P.E. (July 8, 2000)

More  Bistable Multivibrator or Flip/Flop Circuits    Light Detectors or Optical Sensors

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