const int pintriger = 2, pinecho = 3;
long waktu;
int jarak;

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


void loop() 
{
  digitalWrite(pintriger, LOW);
  delayMicroseconds(2);
  digitalWrite(pintriger, HIGH);
  delayMicroseconds(10);
  digitalWrite(pintriger, LOW);
  waktu = pulseIn(pinecho, HIGH);
  jarak = waktu*0.034/2;
  Serial.print("Jarak: ");
  Serial.println(jarak);
}