int potValue, oldPotValue, potPin = A0;

void setup() {
  Serial.begin(115200);
  Serial.println("Center potentiometer around 512.");
  while (analogRead(potPin) < 500 || analogRead(potPin) > 524); // deadband start
}

void loop() {
  potValue = analogRead(potPin); // read current pot value
  if (oldPotValue != potValue) { // compare to stored pot value
    if (oldPotValue > potValue) { // if old value is greater than new value
      Serial.print(potValue);
      Serial.println (" <-- CCW"); // pot was turned "left"
    } else { // but if old value is less than new value
      Serial.print("CW --> "); // pot was turned "right"
      Serial.println(potValue);
    }
    oldPotValue = potValue; // store current pot value
  }
}