const int irSensorPin = 2;
int count = 0;
int lastState = HIGH;  
void setup() {
  pinMode(irSensorPin, INPUT);
  Serial.begin(9600);
  Serial.print("People Count: ");
  Serial.println(count);
}

void loop() {
  int currentState = digitalRead(irSensorPin);
  if (currentState == LOW && lastState == HIGH) {
    count++;
    Serial.print("People Count: ");
    Serial.println(count);
    delay(500);
  }
  lastState = currentState;
  delay(50);
}