#define timeSeconds 10
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701
#define LDR_PIN 34

const int led = 26;
const int motionSensor = 27;
const int trigPin = 5;
const int echoPin = 18;

unsigned long now = millis();
unsigned long lastTrigger = 0;
boolean startTimer = false;
boolean motion = false;
long duration;
float distanceCm;
float distanceInch;

// PIR Motion Sensor
void IRAM_ATTR detectsMovement() {
  digitalWrite(led, HIGH);
  startTimer = true;
  lastTrigger = millis();
}

void setup() {
  Serial.begin(115200);

  // PIR Motion Sensor
  pinMode(motionSensor, INPUT_PULLUP);
  attachInterrupt(digitalPinToInterrupt(motionSensor), detectsMovement, RISING);

  pinMode(led, OUTPUT);
  digitalWrite(led, LOW);

  // HC-SR04 Ultrasonic Distance Sensor
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Photoresistor (LDR) Sensor
  pinMode(LDR_PIN, INPUT);
}

void loop() {
  // Photoresistor (LDR) sensor
  int lightIntensity = analogRead(LDR_PIN);

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

  // Logika LED berdasarkan intensitas cahaya
  if (lightIntensity > 30) {
    digitalWrite(led, HIGH);  // Nyalakan LED jika intensitas cahaya tinggi
  } else {
    digitalWrite(led, LOW);   // Matikan LED jika intensitas cahaya rendah
  }

  // HC-SR04 Ultrasonic Distance Sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);
  distanceCm = (duration * SOUND_SPEED) / 2;
  distanceInch = distanceCm * CM_TO_INCH;

  Serial.print("Distance (cm): ");
  Serial.println(distanceCm);
  Serial.print("Distance (inch): ");
  Serial.println(distanceInch);

  // PIR Motion Sensor menyalakan LED
  now = millis();
  if ((digitalRead(led) == HIGH) && !motion) {
    Serial.println("MOTION DETECTED!!!");
    motion = true;
  }

  if (startTimer && (now - lastTrigger > (timeSeconds * 1000))) {
    Serial.println("Motion stopped...");
    digitalWrite(led, LOW);
    startTimer = false;
    motion = false;
  }

  delay(1000); // this speeds up the simulation
}