variable

Using Arduino Project Guidance
6

am i on the right line?
i did noticed the LED starts LOW not HIGH?

const int ledPin =  13;      // the number of the LED pin
long sensorPin = A0;    // select the input pin for the potentiometer
long sensorValue = 0;  // variable to store the value coming from the sensor
// Variables will change:
int ledState = LOW;             // ledState used to set the LED
long previousMillis = 0;        // will store last time LED was updated


void setup() {
  // set the digital pin as output:
  pinMode(ledPin, OUTPUT);      
}

void loop()
{

  long sensorValue = analogRead(sensorPin);
  long sensor = map(sensorValue, 0, 1023, 30000UL, 1500000UL); 
  unsigned long currentMillis = millis();

  if(currentMillis - previousMillis > sensor) {

    previousMillis = currentMillis;   

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW)
      ledState = HIGH;
    else
      ledState = LOW;

    // set the LED with the ledState of the variable:
    digitalWrite(ledPin, ledState);
  }
}