int ledpin = 8;
int potMeter = A1;

void setup() {
  pinMode(ledpin, OUTPUT);
  pinMode(potMeter, INPUT);

}

void loop() {
  
  int scale = (5000-100)/(1023);
  int offset = 100;
  int time = analogRead(potMeter) * scale + offset;

  digitalWrite(ledpin, HIGH);
  delay(time);
  digitalWrite(ledpin, LOW);
  delay(time);
  }