#define IR_PIN D0 // Define pin D0 for the infrared sensor

void setup() {
  Serial.begin(9600);  // Initialize serial communication
  pinMode(IR_PIN, INPUT); // Configure pin D0 as input
}

void loop() {
  int irValue = digitalRead(IR_PIN);  // Read IR sensor value
  
  if (irValue == LOW) {
    Serial.println(1);  // Print 1 on serial port if obstacle detected
  } else {
    Serial.println(0);  // Print 0 on serial port if no obstacle is detected
  }
  
  delay(500);  // Wait 500 ms before next reading
}