const int pinTrigger = 7;
const int pinEcho = 8;

long waktu;
int distance;

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

void loop() {
  digitalWrite(pinTrigger, LOW);
  delayMicroseconds(2);
  digitalWrite(pinTrigger, HIGH);
  delayMicroseconds(10);
  digitalWrite(pinTrigger, LOW);
  waktu = pulseIn(pinEcho, HIGH);
  distance = waktu * 0.0344 / 2;
  Serial.println(distance);
  delay(100);
}