int val_pot;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(7, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  val_pot = analogRead(A0);
  Serial.print("The digital value is: ");
  //print out the value you read on the serial monitor
  Serial.println(val_pot);
  if(val_pot > 300) {
    digitalWrite(7, HIGH);
  } else {
    digitalWrite(7, LOW);
  }
  //Wait 10 ms for the next reading.
  delay(100);
}