const int trigPin = 7;   // Pin trigger sensor jarak
const int echoPin = 6;   // Pin echo sensor jarak
const int ldrPin = A0;   // Pin sensor cahaya LDR
const int ledPin = 8;    // Pin LED

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

void loop() {
  // Pengukuran jarak menggunakan sensor jarak
  float distance = measureDistance();

  // Pembacaan intensitas cahaya menggunakan LDR
  int lightIntensity = analogRead(ldrPin);

  // Jika jarak lebih pendek dari ambang batas dan intensitas cahaya rendah
  if (distance < 50 && lightIntensity < 300) {
    digitalWrite(ledPin, HIGH); // Nyalakan LED
  } else {
    digitalWrite(ledPin, LOW);  // Matikan LED
  }
  Serial.print("Jarak: ");
  Serial.print(distance);
  Serial.println(" cm");

  Serial.print("Intensitas Cahaya: ");
  Serial.println(lightIntensity);

  delay(1000);
}

float measureDistance() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  float distance_cm = duration * 0.034 / 2.0;

  return distance_cm;
}