Last Updated: 01/12/2021

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Photointerrupter HY301

Components >> Photointerrupter HY301

Photointerrupter HY301

Photointerrupters pass an IR beam across a slot to a receiver. When the path is blocked the receiver output value (analogue) changes.

They are extrememly accurate so very useful for using as an indexing point for a stepper motor,

This is one of the components that I am using for my model railway DCC turntable project.

This tutorial will be based on the HY301 Photointerrupter although the code should work with models.

Components HY301 Photointerrupter
2 x 330 ohm resistors
Arduino Uno

Connections:

Pin 1 (H) Connect to pin A0 on Arduino and connect to Arduino Gnd through a 330OHM resistor
Pin 2 (Y) Connect to Arduino 5v
Pin 3 Connect to Arduino 5v through a 330ohm resistor
Pin 4 Connects to Arduino GND

As shown in photos below

 

Example 1: PhotoInterrupterHY301_21_test.ino

Click to Download code: PhotoInterrupterHY301_21_test.ino

NOTE: If the slot is blocked by a solid item, something like metal, the reading will drop to to Zero, however if the material is slightly opaque such as certain plastics the value may not drop totally to Zero as some light passes through the plastic.

Also in use try to block the whole slot at once so keep the material as square to the slot as possible for the best results.

 

 
/*  01/12/2021
   PhotoInterrupterHY301_21_test
    Simple Sketch to show the photointerupter is working
*/


//Variable that will hold the analog reading from Arduino pin A0
int photointerrupterState;



void setup() {
  Serial.begin(9600);
  Serial.print("PhotoInterrupterHY301_21_test");

}
void loop() {
  photointerrupterState = analogRead(A0);
  Serial.println(photointerrupterState);
  delay(500);
}

Additional Resource Links

Functions 3 : analoglRead() Reading an Analog pin, converting to Voltage 03/09/2021

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