int led1 = 8;
int led2 = 9;
int led4 = 10;
int led8 = 11;
int potPin = A1;
int vrednost;
int rezultat;

void setup () {
  pinMode (led1, OUTPUT);
  pinMode (led2, OUTPUT);
  pinMode (led4, OUTPUT);
  pinMode (led8, OUTPUT);
  pinMode (potPin, INPUT);
  Serial.begin (9600);
}

void loop () {
  vrednost = analogRead (potPin);
  rezultat = (15./1023.)*vrednost;
  Serial.println (rezultat);
  if (rezultat == 0) {
    digitalWrite (led1, LOW);
    digitalWrite (led2, LOW);
    digitalWrite (led4, LOW);
    digitalWrite (led8, LOW);
  }
  if (rezultat == 1) {
    digitalWrite (led1, HIGH);
    digitalWrite (led2, LOW);
    digitalWrite (led4, LOW);
    digitalWrite (led8, LOW);
  }
  if (rezultat == 2) {
    digitalWrite (led1, LOW);
    digitalWrite (led2, HIGH);
    digitalWrite (led4, LOW);
    digitalWrite (led8, LOW);
  }
  if (rezultat == 3) {
    digitalWrite (led1, HIGH);
    digitalWrite (led2, HIGH);
    digitalWrite (led4, LOW);
    digitalWrite (led8, LOW);
  }
  


  if (rezultat == 4) {
    digitalWrite (led1, LOW);
    digitalWrite (led2, LOW);
    digitalWrite (led4, HIGH);
    digitalWrite (led8, LOW);
  }
  if (rezultat == 5) {
    digitalWrite (led1, HIGH);
    digitalWrite (led2, LOW);
    digitalWrite (led4, HIGH);
    digitalWrite (led8, LOW);
  }
  if (rezultat == 6) {
    digitalWrite (led1, LOW);
    digitalWrite (led2, HIGH);
    digitalWrite (led4, HIGH);
    digitalWrite (led8, LOW);
  }
  if (rezultat == 7) {
    digitalWrite (led1, HIGH);
    digitalWrite (led2, HIGH);
    digitalWrite (led4, HIGH);
    digitalWrite (led8, LOW);
  }
  if (rezultat == 8) {
    digitalWrite (led1, LOW);
    digitalWrite (led2, LOW);
    digitalWrite (led4, LOW);
    digitalWrite (led8, HIGH);
  }
  if (rezultat == 9) {
    digitalWrite (led1, HIGH);
    digitalWrite (led2, LOW);
    digitalWrite (led4, LOW);
    digitalWrite (led8, HIGH);
  }
  if (rezultat == 10) {
    digitalWrite (led1, LOW);
    digitalWrite (led2, HIGH);
    digitalWrite (led4, LOW);
    digitalWrite (led8, HIGH);
  }
  if (rezultat == 11) {
    digitalWrite (led1, HIGH);
    digitalWrite (led2, HIGH);
    digitalWrite (led4, LOW);
    digitalWrite (led8, HIGH);
  }
  if (rezultat == 12) {
    digitalWrite (led1, LOW);
    digitalWrite (led2, LOW);
    digitalWrite (led4, HIGH);
    digitalWrite (led8, HIGH);
  }
  if (rezultat == 13) {
    digitalWrite (led1, HIGH);
    digitalWrite (led2, LOW);
    digitalWrite (led4, HIGH);
    digitalWrite (led8, HIGH);
  }
  if (rezultat == 14) {
    digitalWrite (led1, LOW);
    digitalWrite (led2, HIGH);
    digitalWrite (led4, HIGH);
    digitalWrite (led8, HIGH);
  }
  if (rezultat == 15) {
    digitalWrite (led1, HIGH);
    digitalWrite (led2, HIGH);
    digitalWrite (led4, HIGH);
    digitalWrite (led8, HIGH);
  }
}