const int trigPin = 2;  // Trig pin of the ultrasonic sensor
const int echoPin = 3;  // Echo pin of the ultrasonic sensor
const int ledPin = 13;  // LED pin for feedback

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

void loop() {
  long duration, distance;
  
  // Trigger the ultrasonic sensor
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  // Measure the echo duration
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance in centimeters
  distance = duration * 0.034 / 2;
  
  // Print the distance to the serial monitor
  Serial.print("Distance: ");
  Serial.println(distance);

  // Check if the toilet is occupied or vacant based on the distance
  if (distance < 10) {
    // Toilet is occupied
    digitalWrite(ledPin, HIGH);
    Serial.println("Toilet Occupied");
  } else {
    // Toilet is vacant
    digitalWrite(ledPin, LOW);
    Serial.println("Toilet Vacant");
  }

  delay(1000);  // Delay for readability and to avoid rapid changes
}