//program sensor jarak HC_SR04
#define ECHO_PIN 2
#define TRIG_PIN 3
int durasi;
float jarak;


void setup() {
  Serial.begin(9500);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

}

void loop() {
  //menghitung jarak 
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN,HIGH);//MENGIRIM SINYAL
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  durasi = pulseIn(ECHO_PIN,HIGH);// menerima sinyal kemudian dihitung durasinya
  jarak = durasi * 0.034 / 2; //menghitung jarak berdasarkan rumus
  //menanmpilkan jarak diserial monitor
  Serial.print("jarak: "); // menampilkan tulisan jarak
  Serial.println(jarak); //menampilkan isi variable jarak
  delay(200);

}