const int ledPin = 9; 
const int potPin = A0; 

void setup() {
  pinMode(ledPin, OUTPUT); 
  pinMode(potPin, INPUT);  
}

void loop() {
  int potValue = analogRead(potPin);
  int blinkDelay = map(potValue, 0, 1023, 100, 1000); 
  
  digitalWrite(ledPin, HIGH); 
  delay(blinkDelay);          
  digitalWrite(ledPin, LOW);
  delay(blinkDelay);          
}