int ledPin = 10;
int potMeter = A0;
float newScale = (5000 - 100)/(1023 - 0);
int offset = 100;

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT);
  pinMode(potMeter, INPUT);
}

void loop() {
  int potValue = analogRead(potMeter);
  Serial.print(potValue);
  int mappedValue = potValue * newScale + offset;

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