long bacajarak (int triggerPin, int echoPin){
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin,INPUT);
  digitalWrite(triggerPin, LOW);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  return pulseIn(echoPin,HIGH);
}
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
int cm = 0;
cm = (0.03446 * bacajarak(2,3))/2;
Serial.print(cm);
Serial.println("cm");
delay(100);
}