int dt=500;
int led1=6;
int potpin=A0;
int potval;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(potpin,INPUT);
pinMode(led1,OUTPUT);
}

void loop() { 
  // put your main code here, to run repeatedly:
potval=analogRead(potpin);
Serial.println(potval);
delay(dt);

while (potval>1000) {
digitalWrite(led1, HIGH);
potval=analogRead(potpin);
Serial.println(potval);
delay(dt);
}
digitalWrite(led1, LOW);
}