Homekit Occupancy Presence Sensor LD2410 Code

#include "HomeSpan.h"

#define LD2410_PIN 4  // GPIO pin connected to the sensor's OUT pin

////////////////////////////////////////////
// Occupancy Sensor Service Definition
////////////////////////////////////////////

struct OccupancySensor : Service::OccupancySensor {

  SpanCharacteristic *occupancy; // 0 = Not Occupied, 1 = Occupied

  // Constructor
  OccupancySensor() : Service::OccupancySensor() {
    occupancy = new Characteristic::OccupancyDetected(0);
    pinMode(LD2410_PIN, INPUT); // or INPUT_PULLUP if needed
  }

  // Continuously called by HomeSpan
  void loop() {
    bool isPresent = digitalRead(LD2410_PIN);
    occupancy->setVal(isPresent ? 1 : 0);
  }
};

////////////////////////////////////////////
// Setup and Main Loop
////////////////////////////////////////////

void setup() {
  Serial.begin(115200);

  // Initialize HomeSpan
  homeSpan.begin(Category::Sensors, "LD2410 Occupancy Sensor");

  // Create an Accessory with Identify + Occupancy
  new SpanAccessory();
    new Service::AccessoryInformation();
      new Characteristic::Identify();
    new OccupancySensor();  // Attach our custom OccupancySensor
}

void loop() {
  homeSpan.poll();
}