#define IR_SENSOR 4
#define LED 13

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(IR_SENSOR, INPUT);
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);
}

void loop() {
  int a=digitalRead(IR_SENSOR);
  if(a==1){
    digitalWrite(LED, HIGH);
    Serial.println("Obstacle Detected");
    delay(500);
    digitalWrite(LED, LOW);
  } 
  delay(1000);
}