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What is a Photointerrupter?

Photointerrupter usage examples

Current flows to the LED, causing it to light up. This light enters the phototransistor, resulting in current flow.

Infrared LED - Current to light / Phototransistor - Light to current

Object detection is enabled by detecting the change in transistor current due to the presence/absence of a screen.

Current flow in the Phototransistor

Usage Example: Detecting Voltage Change at the Phototransistor Side

Usage Example
PhotointerrupterProduct Page