// sensor ultrasonic HC-SR04
const int trigPin = 9;
const int echoPin = 10;

// sensor cahaya LDR
const int ldrPin = A0;

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

void loop() {
  // Pembacaan Ultrasonik
  long duration;
  float distance;

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2; // kecepatan suara 0.034 cm/us, dibagi 2 karena pulang-pergi

  // Pembacaan LDR
  int ldrValue = analogRead(ldrPin);

  // Tampilkan ke Serial Monitor
  Serial.print("Jarak: ");
  Serial.print(distance);
  Serial.print(" cm\t");

  Serial.print("Cahaya (LDR): ");
  Serial.println(ldrValue);

  delay(500); // delay setengah detik
}