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Sensors / Detectors: Position Detectors
Last Updated on:  Thursday, May 15, 2008 08:25 AM
Circuits Designed by Dave Johnson, P.E. :
  • OPTICAL INTERRUPTER DRAWS MICROAMPS
    This circuit is great for battery-powered systems that use slotted type optical interrupters. It draws only 10uA from a 3v battery that should allow up to 5 years of operation from a lithium battery.

  • HONEYBEE COUNTER
    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.

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Autozero a position sensing detector:  03/18/99 EDN-Design Ideas / (added 8/03)

Biasing Corrects Position Sensing Photodiode:  07/04/94 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) An integrator powers the light source in Fig 1's position-sensing circuit, eliminating errors arising from variations in the source's intensity. This circuit's accuracy is essentially that of the sensor itself, beating designs that use a more complex analog divider....  

Digital Position Encoder Does Away with ADC:  05/08/97 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)

Park Aid:  3-LEDs signal bumper-barrier distance Infrared operation, indoor use (Circuit added 9/04)

Position detectors provide motor control logic:  05/24/01 EDN-Design Ideas / (added 8/03)

Rotary Controller Positions Stepping Motor:  08/03/95 EDN-Design Ideas / (Electronic Circuit diagram added 03/03)  

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