int pot_value = 27;   // select the input pin for the potentiometer
int ledPin = 19;      // select the pin for the LED
int sensorValue = 0;  // variable to store the value coming from the sensor

void setup() {
  Serial.begin(9600);
  pinMode(ledPin, OUTPUT); // declare the ledPin as an OUTPUT
  pinMode(pot_value, INPUT); //declare the pot_value as an INPUT
}

void loop() {
// read the value from the potentiometer:
sensorValue = analogRead(pot_value);

  //led blinking 
  //turn led on
  digitalWrite(ledPin, HIGH);
  // stop the program for  milliseconds:
  delay(sensorValue);
  //turn led off
  digitalWrite(ledPin, LOW);
  // stop the program for  milliseconds:
  delay(sensorValue);
 }