int pot = A1;
int led = 2;
int dt = 500;
int potval;


void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(pot, INPUT);
pinMode(led, OUTPUT);

}

void loop() {
  // put your main code here, to run repeatedly:
potval = analogRead(pot);
while(potval>=1000) {
digitalWrite(led,HIGH);
Serial.println(potval);
}
if(potval<=999) {
  Serial.println(potval);
  digitalWrite(led, LOW);
}
  delay(dt);  
}