#define ECHO_PIN 2 //menginisiasikan pin di ultrasonik di arduino uno
#define TRIG_PIN 3 //menginisiasikan pin di ultrasonik di arduino uno

void setup(){
  Serial.begin(115200); //buat nampilin serial number ardunio nya
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT); //menentukan output dan input
  pinMode(ECHO_PIN, INPUT);  //menentukan output dan input
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);  
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);//11-19 = kondisi
  return duration * 0.034 / 2;
}

void loop(){
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;

  Serial.print("Jarak: ");
  Serial.println(distance);

  delay(100);  //21-34semua di ulang terus menerus jeda 1 detik
}