#define TRIG_PIN 5     
#define ECHO_PIN 18    
#define LED_PIN 2      

long duration;
float distance;

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);

  Serial.println("===============================");
  Serial.println("   🚀 IoT Distance Dashboard   ");
  Serial.println("===============================");
  Serial.println("Student Name: Alaa Mohamed Hosny ");
  Serial.println("ID : 230105453");
  Serial.println("System Started ✅");
  Serial.println("Measuring distance...\n");
}

void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH);

  distance = duration * 0.034 / 2;

  bool ledState = (distance < 10.0);
  digitalWrite(LED_PIN, ledState ? HIGH : LOW);

  Serial.println("──────────────────────────────");
  Serial.print("📏 Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  Serial.print("💡 LED Status: ");
  Serial.println(ledState ? "ON 🔆 (Object Close)" : "OFF ⚫ (Object Far)");

  Serial.println("──────────────────────────────\n");
  delay(1000);
}