// Pin Definitions
const int irSensorPin = 2;     // IR sensor output connected to digital pin 2
const int ledPin = 13;         // LED connected to digital pin 13

void setup() {
  pinMode(irSensorPin, INPUT); // Set IR sensor pin as input
  pinMode(ledPin, OUTPUT);     // Set LED pin as output
}

void loop() {
  int irValue = digitalRead(irSensorPin); // Read value from IR sensor

  if (irValue == LOW) {
    // Obstacle detected (typically LOW when something is in front of sensor)
    digitalWrite(ledPin, HIGH); // Turn on LED
  } else {
    // No obstacle
    digitalWrite(ledPin, LOW);  // Turn off LED
  }
}