Dimmable Switch with RobotDyn AC Light Dimmer Module. https://help.sinric.pro/pages/tutorials/tutorials/dimmable-switch/robotdyn-ac-light-dimmer.html

sinricpro-Dimmable-Switch-with-RobotDyn.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 <RBDdimmer.h> //https://github.com/RobotDynOfficial/RBDDimmer

#include "SinricPro.h"
#include "SinricProDimSwitch.h"

#define WIFI_SSID         ""    
#define WIFI_PASS         ""
#define APP_KEY           ""   // Should look like "de0bxxxx-1x3x-4x3x-ax2x-5dabxxxxxxxx"
#define APP_SECRET        ""   // Should look like "5f36xxxx-x3x7-4x3x-xexe-e86724a9xxxx-4c4axxxx-3x3x-x5xe-x9x3-333d65xxxxxx"
#define DIMSWITCH_ID      ""   // Should look like "5dc1564130xxxxxxxxxxxxxx"
#define BAUD_RATE         115200                // Change baudrate to your need

const int ZC_PIN  = 4;
const int PWM_PIN  = 2;
const int MIN_POWER  = 0;
const int MAX_POWER  = 80;
int power  = 0;

dimmerLamp acd(PWM_PIN, ZC_PIN);

// we use a struct to store all states and values for our dimmable switch
struct {
  bool powerState = false;
  int powerLevel = 0;
} device_state;

void setPWM(int powerLevel) {
   int power = map(powerLevel, 0, 100, MIN_POWER, MAX_POWER); // Map power level from 0 to 100, to a value between 0 to 80
   acd.setPower(power);     
   delay(30);
} 

bool onPowerState(const String &deviceId, bool &state) {
  Serial.printf("Device %s power turned %s \r\n", deviceId.c_str(), state?"on":"off");
  device_state.powerState = state;  
  setPWM(state ? 100: 0);
  return true; // request handled properly
}

bool onPowerLevel(const String &deviceId, int &powerLevel) {
  device_state.powerLevel = powerLevel; 
  setPWM(powerLevel);
  Serial.printf("Device %s power level changed to %d\r\n", deviceId.c_str(), device_state.powerLevel);
  return true;
}

bool onAdjustPowerLevel(const String &deviceId, int &levelDelta) {
  device_state.powerLevel += levelDelta;
  Serial.printf("Device %s power level changed about %i to %d\r\n", deviceId.c_str(), levelDelta, device_state.powerLevel);
  levelDelta = device_state.powerLevel;
  setPWM(levelDelta);
  return true;
}

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]);
}

void setupSinricPro() {
  SinricProDimSwitch &myDimSwitch = SinricPro[DIMSWITCH_ID];

  // set callback function to device
  myDimSwitch.onPowerState(onPowerState);
  myDimSwitch.onPowerLevel(onPowerLevel);
  myDimSwitch.onAdjustPowerLevel(onAdjustPowerLevel);

  // setup SinricPro
  SinricPro.onConnected([](){ Serial.printf("Connected to SinricPro\r\n"); }); 
  SinricPro.onDisconnected([](){ Serial.printf("Disconnected from SinricPro\r\n"); });
  SinricPro.begin(APP_KEY, APP_SECRET);
}

void setupRBDdimmer(){
   acd.begin(NORMAL_MODE, ON);
} 

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

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