float var;

void setup () {
  pinMode(9, INPUT);
  pinMode(13, OUTPUT);
  Serial.begin(9600);
}

void loop () {
  var = analogRead(A3);
  if(var<=1000)
  {
    digitalWrite(13,HIGH);
  }
    else
    digitalWrite(13,LOW);
    Serial.println(var);
    //delay(1000)
 
}