const int TRIGPIN = 8;
const int ECHOPIN = 9;
long timer;
int jarak;

void setup(){
  Serial.begin(9600);
  pinMode(ECHOPIN, INPUT);
  pinMode(TRIGPIN, OUTPUT);
}

void loop(){
  digitalWrite(TRIGPIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGPIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGPIN, LOW);

  timer = pulseIn(ECHOPIN,HIGH);
  jarak = timer/58;
  delay(1000);

  Serial.print("jarak = ");
  Serial.print(jarak);
  Serial.print(" cm");
  Serial.println();
}