const int potPin = A0;
const int ledPin = 8;
void setup() {
  pinMode(ledPin, OUTPUT);
}
void loop() {
  int potValue = analogRead(potPin);
  int delayTime = map(potValue, 0, 1023, 100, 1000); 

  digitalWrite(ledPin, HIGH);  
  delay(delayTime);
  digitalWrite(ledPin, LOW);
  delay(delayTime);  
}