#define TRIG_PIN 9
#define ECHO_PIN 10
#define LED1 3
#define LED2 5
#define LED3 6

void setup() {
  pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);
      pinMode(LED1, OUTPUT);
        pinMode(LED2, OUTPUT);
          pinMode(LED3, OUTPUT);
            Serial.begin(9600);
            }

            void loop() {
              long duration, distance;

                // Mengatur Trigger
                  digitalWrite(TRIG_PIN, LOW);
                    delayMicroseconds(2);
                      digitalWrite(TRIG_PIN, HIGH);
                        delayMicroseconds(10);
                          digitalWrite(TRIG_PIN, LOW);

                            // Membaca Echo
                              duration = pulseIn(ECHO_PIN, HIGH);
                                distance = (duration * 0.0344) / 2;  // Menghitung jarak dalam cm

                                  // Menyalakan LED sesuai jarak yang terdeteksi
                                    if (distance >= 1 && distance <= 10) {
                                        digitalWrite(LED1, HIGH);
                                            digitalWrite(LED2, LOW);
                                                digitalWrite(LED3, LOW);
                                                  } else if (distance >= 11 && distance <= 20) {
                                                      digitalWrite(LED1, LOW);
                                                          digitalWrite(LED2, HIGH);
                                                              digitalWrite(LED3, LOW);
                                                                } else if (distance >= 21 && distance <= 30) {
                                                                    digitalWrite(LED1, LOW);
                                                                        digitalWrite(LED2, LOW);
                                                                            digitalWrite(LED3, HIGH);
                                                                              } else {
                                                                                  // Mematikan semua LED jika jarak lebih dari 30 cm
                                                                                      digitalWrite(LED1, LOW);
                                                                                          digitalWrite(LED2, LOW);
                                                                                              digitalWrite(LED3, LOW);
                                                                                                }

                                                                                                  // Menampilkan jarak di Serial Monitor
                                                                                                    Serial.print("Distance: ");
                                                                                                      Serial.println(distance);
                                                                                                        delay(500);  // Delay untuk menghindari pembacaan terlalu cepat
                                                                                                        }