int echoPin = 22;
int trigPin = 23;

void setup() {
  Serial.begin(115200);
  pinMode(echoPin, INPUT);
  pinMode(trigPin, OUTPUT);
}

void loop() {
  delay(100);

  digitalWrite(trigPin, HIGH);
  digitalWrite(trigPin, LOW);

  Serial.println(pulseIn(echoPin, HIGH) * 0.017002 + 0.01);
}