IR slotted switch sensor

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There is a type of detector known as a “slotted switch” that consists of a phototransistor/LED pair mounted on a solid frame with a small air gap between the two elements. A typical circuit might be:

               o +5v     o +5v                |         |                |         |                \         \     220 ohms   /         / 4.7K                \         \                /         /                |         |                |         +-------> Vout               _|_        /               \ /      |/              -----     |\ NPN                |         \                |          |                |          |                |          |               GND        GND                 | air gap |  

When the air gap is unobstructed, the transistor saturates, pulling Vout to ground; when the gap is blocked, the transistor cuts off and Vout is +5 volts.

Sources

  • Paul Hitchcock

Category:InfraRed

 

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