Step 1: Things You Need

  • Arduino UNO
  • Photo Interrupter Module
  • Breadboard
  • Connecting Wires

Step 2: Schematics

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

KY-010 - Arduino
- (left) - GND
middle - +5V
S (right) - Pin 3

Step 3: Code

Please copy the following code and upload it to your arduino Board :

int Led = 13; // define LED pin
int buttonpin = 3; // define photo interrupter signal pin
int val; //define a numeric variable

void setup()
pinMode(Led, OUTPUT); // LED pin as output
pinMode(buttonpin, INPUT); //photo interrupter pin as input

void loop()
val=digitalRead(buttonpin); //read the value of the sensor
if(val == HIGH) // turn on LED when sensor is blocked

Step 4: Testing Photo Interrupter Module

The arduino will light up the LED (pin 13) on the Arduino when there's an object blocking the beam of light between the sensor's gap.