Sinric Pro Motion Sensor. Tutorial: https://help.sinric.pro/pages/tutorials/motion-sensors/HC-SR501-HC-SR505-AM312-HC-SR312.html

sinricpro-motion-sensor.ino

// Uncomment the following line to enable serial debug output
//#define ENABLE_DEBUG

#ifdef ENABLE_DEBUG
  #define DEBUG_ESP_PORT Serial
  #define NODEBUG_WEBSOCKETS
  #define NDEBUG
#endif 

#include <Arduino.h>
#if defined(ESP8266)
  #include <ESP8266WiFi.h>
#elif defined(ESP32) || defined(ARDUINO_ARCH_RP2040)
  #include <WiFi.h>
#endif

#include "SinricPro.h"
#include "SinricProMotionsensor.h" 

#define WIFI_SSID         ""   // Your WiFI SSID name 
#define WIFI_PASS         ""   // Your WiFi Password.
#define APP_KEY           ""   // Should look like "de0bxxxx-1x3x-4x3x-ax2x-5dabxxxxxxxx" (Get it from Portal -> Secrets)
#define APP_SECRET        ""   // Should look like "5f36xxxx-x3x7-4x3x-xexe-e86724a9xxxx-4c4axxxx-3x3x-x5xe-x9x3-333d65xxxxxx" (Get it from Portal -> Secrets)
#define MOTION_SENSOR_ID  ""   // Should look like "5dc1564130xxxxxxxxxxxxxx" (Get it from Portal -> Devices)
#define BAUD_RATE         115200              // Change baudrate to your need (used for serial monitor)
 
#if defined(ESP8266)
  #define SENSOR_PIN        D1
#elif defined(ESP32) 
  #define SENSOR_PIN        26
#elif (ARDUINO_ARCH_RP2040)
  #define SENSOR_PIN        5
#endif 

int newState;
int oldState;

void handleMotionSensor() {
  newState = digitalRead(SENSOR_PIN); // read current state

  if(oldState != newState) {
    if (newState == HIGH) {
      Serial.println("Movement detected!");
    } else {
      Serial.println("Movement not detected!");
    }

    // newState == true (HIGH) : if motion has been detected 
    // newState == false (LOW): if no motion has been detected

    SinricProMotionsensor &myMotionsensor = SinricPro[MOTION_SENSOR_ID]; // get motion sensor device
    myMotionsensor.sendMotionEvent(newState);

    oldState = newState;
  }
}


// setup function for WiFi connection
void setupWiFi() {
  Serial.printf("\r\n[Wifi]: Connecting");

  #if defined(ESP8266)
    WiFi.setSleepMode(WIFI_NONE_SLEEP); 
    WiFi.setAutoReconnect(true);
  #elif defined(ESP32)
    WiFi.setSleep(false); 
    WiFi.setAutoReconnect(true);
  #endif

  WiFi.begin(WIFI_SSID, WIFI_PASS); 

  while (WiFi.status() != WL_CONNECTED) {
    Serial.printf(".");
    delay(250);
  }
  IPAddress localIP = WiFi.localIP();
  Serial.printf("connected!\r\n[WiFi]: IP-Address is %d.%d.%d.%d\r\n", localIP[0], localIP[1], localIP[2], localIP[3]);
}
 
// setup function for SinricPro
void setupSinricPro() {
  // add device to SinricPro
  SinricProMotionsensor &mySensor = SinricPro[MOTION_SENSOR_ID];
   
  // setup SinricPro
  SinricPro.onConnected([](){ Serial.printf("Connected to SinricPro\r\n"); }); 
  SinricPro.onDisconnected([](){ Serial.printf("Disconnected from SinricPro\r\n"); });
  //SinricPro.restoreDeviceStates(true); // Uncomment to restore the last known state from the server.
  SinricPro.begin(APP_KEY, APP_SECRET);  
}

void setupMotionSensor() {
  pinMode(SENSOR_PIN, INPUT);
  Serial.printf("Wait 10 secs for the PIR sensor to calibrate properly\r\n");
  delay(1000 * 10);  
}

// main setup function
void setup() {
  Serial.begin(BAUD_RATE); Serial.printf("\r\n\r\n");
  
  setupMotionSensor();
  setupWiFi();
  setupSinricPro();
}

void loop() {
  SinricPro.handle();
  handleMotionSensor();
}