#define trig 13
#define echo 12

long waktu;
double jarak;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT );

}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite (trig,HIGH);
  delayMicroseconds(10);
  digitalWrite (trig,LOW );
  delayMicroseconds(0);

  waktu = pulseIn (echo,HIGH );
  jarak = waktu/117;
  Serial.print(jarak );
  Serial.print("cm");
  delay(1000);
}