Where am I so far?

I am working on to making the EMF radiation detector but I am finding it difficult to make the LED bar graph to work :S

However, I have managed to find a link that actually shows me how to light it up so I am still working on it. 

But I managed to make the programming work on the Arduino app > 

const int ledPin =  1;      // the number of the LED pin

int ledState = LOW;             // ledState used to set the LED

long previousMillis = 0;        // will store last time LED was updated

long interval = 1000;           // interval at which to blink (milliseconds)

void setup() {

  

  pinMode(ledPin, OUTPUT);      

}

void loop()

{

  unsigned long currentMillis = millis();

  if(currentMillis - previousMillis > interval) {

    

    previousMillis = currentMillis;   

    

    if (ledState == LOW)

      ledState = HIGH;

    else

      ledState = LOW;

    digitalWrite(ledPin, ledState);

  }

}