Infrared proximity testing using arduino

Infrared proximity testing using arduino 

void setup() {

  pinMode(A3,OUTPUT);

  pinMode(A5,INPUT_PULLUP);

  pinMode(13,OUTPUT);

  pinMode(A4,OUTPUT);

  digitalWrite(A3,HIGH);

  digitalWrite(A4,LOW);

  digitalWrite(13,LOW);

  delay(1000);

}

void loop() {

  if(digitalRead(A5)==HIGH)

  {

    digitalWrite(13,LOW);

    

  }

  else

  {

    digitalWrite(13,HIGH);

    delay(1000);

  }

}