const int TRIG_OUT = 13;
const int ECHO_IN = 12;
int distance = 0;
void setup() {
  // put your setup code here, to run once:
  pinMode(TRIG_OUT, OUTPUT);
  pinMode(ECHO_IN, INPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(TRIG_OUT, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_OUT, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_OUT, LOW);
  distance = pulseIn(ECHO_IN, HIGH) / 58.0;
  Serial.print(distance);
  Serial.println("cm");
}