const int irSensorPin = 3; // IR sensor output connected to digital pin 3

void setup() {
  pinMode(irSensorPin, INPUT);     // Set pin 3 as input
  Serial.begin(9600);              // Start Serial Monitor
}

void loop() {
  int sensorState = digitalRead(irSensorPin); // Read sensor output

  if (sensorState == LOW) {
    Serial.println("Obstacle Detected");
  } else {
    Serial.println("Clear");
  }

  delay(500); // Wait half a second before next reading
}