const int trigPin = 12;
const int echoPin = 13;
long vrijeme;
int distanca;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  vrijeme = pulseIn(echoPin, HIGH);
  distanca = vrijeme*0.034/2;

  Serial.print("Distanca: ");
  Serial.println(distanca);
}