// Pin assignments for IR sensors and relay module
int irSensorEntry = 9;
int irSensorExit = 8;
int relayPin = 13;

// Variables to keep track of the number of people
int count = 0;
bool personInside = false;

void setup() {
  // Initialize IR sensor pins as input and relay pin as output
  pinMode(irSensorEntry, INPUT);
  pinMode(irSensorExit, INPUT);
  pinMode(relayPin, OUTPUT);
  
  // Turn off the lights to start
  digitalWrite(relayPin, LOW);
  
  // Initialize serial communication for debugging
  Serial.begin(9600);
}

void loop() {
  // Read the state of the IR sensors
  int entryState = digitalRead(irSensorEntry);
  int exitState = digitalRead(irSensorExit);
  
  // If someone enters, turn on the lights and increment the count
  if (entryState == HIGH && !personInside) {
    digitalWrite(relayPin, HIGH);
    count++;
    personInside = true;
    Serial.print("Person entered. Count = ");
    Serial.println(count);
  }
  
  // If someone exits, turn off the lights and update the personInside flag
  if (exitState == HIGH && personInside) {
    digitalWrite(relayPin, LOW);
    personInside = false;
    Serial.println("Person exited.");
  }
  
  // Wait a short amount of time to debounce the sensors
  delay(100);
}