const int trigPin = 8;
const int echoPin = 9;

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

void loop() {
  float distance = getUltrasonicDistance(trigPin, echoPin);
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(100);
}

float getUltrasonicDistance(int trigPin, int echoPin) {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  uint64_t duration = pulseIn(echoPin, HIGH);
  return duration * 0.0343 / 2.0;
}