// Constants
const int pirPin = 2; // PIR sensor output pin
const int ledPin = 13; // LED pin

// Variables
bool personDetected = false; // Flag to track person detection

void setup() {
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW); // Ensure LED is initially off
  Serial.begin(9600);
}

void loop() {
  if (digitalRead(pirPin) == HIGH) { // If person detected
    personDetected = true;
    digitalWrite(ledPin, HIGH); // Turn on LED
  } else {
    if (personDetected) { // If person was detected and now left
      personDetected = false;
      digitalWrite(ledPin, LOW); // Turn off LED
    }
  }
  delay(100); // Adjust delay time based on sensor sensitivity and application requirements
}