const int IR_SENSOR_PIN =A2;   // IR sensor output connected to GPIO 2
const int LED_PIN = D4;         // LED anode connected to GPIO 3 through resistor

void setup() {
  pinMode(IR_SENSOR_PIN, INPUT);  // IR sensor is input
  pinMode(LED_PIN, OUTPUT);       // LED is output
  Serial.begin(115200);           // Serial monitor (optional)
}

void loop() {
  int irValue = digitalRead(IR_SENSOR_PIN);

  Serial.print("IR Sensor: ");
  Serial.println(irValue);

  if (irValue == 0) {
    // Object detected (many IR sensors pull LOW when triggered)
    digitalWrite(LED_PIN, HIGH);  // Turn LED ON
  } else {
    digitalWrite(LED_PIN, LOW);   // Turn LED OFF
  }

  delay(100);  // Debounce delay
}