IR slotted switch sensor

Published:2012/11/9 0:32:00 Author:muriel | Keyword: IR slotted switch, sensor | From:SeekIC

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.



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