The KY-010 Photo Interrupter module is a switch that will trigger a signal when the light between the sensor’s gap is blocked.

This module is suitable for various electronic platforms like Arduino, Raspberry Pi, ESP32, and others.

Specifications:

This module consists of an optical emitter/detector and 3 male header pins on the front. On the back, there are two resistors of 10kΩ and 33Ω.

The sensor uses a beam of light between the emitter and detector to check if the path between both is being blocked by an opaque object.

Connection Diagram

Connect the power line (middle) and ground (left) to +5V and GND respectively. Connect signal (S) to pin 3 on the Arduino.