int trigger = 4;
int echo = 5;

void setup() {
  Serial.begin(115200);
  pinMode(trigger, OUTPUT);
  pinMode(echo, INPUT);
}

int finding_distance() {
  digitalWrite(trigger, LOW);
  delayMicroseconds(2);

  digitalWrite(trigger, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigger, LOW);

  long duration = pulseIn(echo, HIGH);
  int distance = duration * 0.034 / 2;

  return distance;
}

void loop() {
  int distance = finding_distance();
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(500);
}