const int trigPin = 9;
const int echoPin = 10;

long duration;
float distance;

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

      void loop() {
        // Reset trig
          digitalWrite(trigPin, LOW);
            delayMicroseconds(2);

              // Kirim pulsa
                digitalWrite(trigPin, HIGH);
                  delayMicroseconds(10);
                    digitalWrite(trigPin, LOW);

                      // Baca pantulan
                        duration = pulseIn(echoPin, HIGH);

                          // Hitung jarak
                            distance = duration * 0.0343 / 2;

                              // Output ke serial
                                Serial.print("Jarak: ");
                                  Serial.print(distance);
                                    Serial.println(" cm");

                                      delay(300);
                                      
}