int IRSensor = 2; // connect ir sensor to arduino pin 2
void setup()
{
  pinMode (IRSensor, INPUT); // sensor pin INPUT
  Serial.begin(9600);
}
 
void loop()
{
  int statusSensor = digitalRead (IRSensor);
   
  if (statusSensor == 1){
    Serial.println("obstacle detected");
  }
   
  else
  {
    Serial.println(" No obstacle detected");
  }
   
}