const int SENSOR_PIN = A0;
const int LED_PINS[] = {12, 11, 10, 9, 8, 7, 6, 5, 4, 3};

int oldSenseValue = -1; // always be different on startup

void setup() {
  Serial.begin(115200);
  for (int i = 0; i < 10; i++)  {
    pinMode(LED_PINS[i], OUTPUT);
  }
}

void loop() {
  int senseValue = map(analogRead(SENSOR_PIN), 0, 1023, 0, 10); // off + 10, 11 steps
  if (senseValue != oldSenseValue)  {
    oldSenseValue = senseValue;
    Serial.print("Mapped potentiometer value: ");
    Serial.println(senseValue);
  }
  // turn all LEDs off
  for (int i = 0; i < 10; i++)  {
    digitalWrite(LED_PINS[i], LOW);
  }
  // turn on LEDs based on senseValue
  for (int pin = 1; pin <= senseValue; pin++)  {
    digitalWrite(LED_PINS[pin - 1], HIGH);
  }
}