This photo interrupter module Arduino compatible can be used to build a simple circuit that produces a photo-interrupter warning lamp. It is composed of an infrared emitter on one upright and a shielded infrared detector on the other. By emitting a beam of infrared light from one upright to the other, the sensor can detect when an object passes between the uprights, breaking the beam.

This Arduino compatible photo interrupter module is used for many applications including optical limit switches, general object detection, etc.

Test Code

int Led = 13; // define LED Interface
int buttonpin = 3; // define the photo interrupter sensor interface
int val; // define numeric variables val

void setup () {
pinMode(Led, OUTPUT); // define LED as output interface
pinMode(buttonpin, INPUT); // define the photo interrupter sensor output interface
}

void loop () {
// digital interface will be assigned a value of 3 to read val
val = digitalRead(buttonpin);

// When the light sensor detects a signal is interrupted, LED flashes
if (val == HIGH) {
digitalWrite(Led, HIGH);
}
else {
digitalWrite(Led, LOW);
}
}