DHT11 and DHT22 Temperature and Humidity Sensor with ESP32 or ESP8266 for Alexa and Google Home

#include "DHT.h" // https://github.com/markruys/arduino-DHT  Support for DHT11 and DHT22, AM2302, RHT03
 
#if defined(ESP8266)
  #define DHT_PIN    D1
#elif defined(ESP32)
  #define DHT_PIN    16
#endif

float temperature;
float humidity;

DHT dht;
 
void setup() {
  Serial.begin(115200);
  delay(10);

  dht.setup(DHT_PIN);
}
 
void loop() {
    delay(dht.getMinimumSamplingPeriod());

    temperature = dht.getTemperature();
    humidity = dht.getHumidity();

    if (isnan(temperature) || isnan(humidity)) {
      Serial.printf("DHT reading failed!\r\n");
      return;
    } else {
      Serial.printf("Temperature: %2.1f Celsius\tHumidity: %2.1f%%\r\n", temperature, humidity);
    }     
}

// 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 "SinricProTemperaturesensor.h"
#include "DHT.h" // https://github.com/markruys/arduino-DHT

#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 TEMP_SENSOR_ID    ""   // Should look like "5dc1564130xxxxxxxxxxxxxx" (Get it from Portal -> Devices)
#define BAUD_RATE         115200              // Change baudrate to your need (used for serial monitor)
#define EVENT_WAIT_TIME   60000               // send event every 60 seconds

#if defined(ESP8266)
  #define DHT_PIN    D1
#elif defined(ESP32)
  #define DHT_PIN    16
#endif

DHT dht;                                      // DHT sensor

float temperature;                            // actual temperature
float humidity;                               // actual humidity
float lastTemperature;                        // last known temperature (for compare)
float lastHumidity;                           // last known humidity (for compare)
   
void handleTemperaturesensor() {
  if (SinricPro.isConnected() == false) {
    Serial.printf("Not connected to Sinric Pro...!\r\n");
    return; 
  }

  static unsigned long last_millis;
  unsigned long        current_millis = millis();
  if (last_millis && current_millis - last_millis < EVENT_WAIT_TIME) return;
  last_millis = current_millis;
  
  temperature = dht.getTemperature();          // get actual temperature in °C
//  temperature = dht.getTemperature() * 1.8f + 32;  // get actual temperature in °F
  humidity = dht.getHumidity();                // get actual humidity

  if (isnan(temperature) || isnan(humidity)) { // reading failed... 
    Serial.printf("DHT reading failed!\r\n");  // print error message
    return;                                    // try again next time
  } 

  Serial.printf("Temperature: %2.1f Celsius\tHumidity: %2.1f%%\r\n", temperature, humidity);

  if (temperature == lastTemperature && humidity == lastHumidity) {
    Serial.printf("Temperature did not changed. do nothing...!\r\n");
    return; 
  }

  SinricProTemperaturesensor &mySensor = SinricPro[TEMP_SENSOR_ID];  // get temperaturesensor device
  bool success = mySensor.sendTemperatureEvent(temperature, humidity); // send event
  if (success) {  
    Serial.printf("Sent!\r\n");
  } else {
    Serial.printf("Something went wrong...could not send Event to server!\r\n"); // Enable ENABLE_DEBUG to see why
  }

  lastTemperature = temperature;  // save actual temperature for next compare
  lastHumidity = humidity;        // save actual humidity for next compare 
}


// 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]);
}

bool onPowerState(const String &deviceId, bool &state) {
  return true; // request handled properly
}

// setup function for SinricPro
void setupSinricPro() {
  // add device to SinricPro
  SinricProTemperaturesensor &mySensor = SinricPro[TEMP_SENSOR_ID];
  mySensor.onPowerState(onPowerState);
  
  // 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);  
}

// main setup function
void setup() {
  Serial.begin(BAUD_RATE); Serial.printf("\r\n\r\n");
  dht.setup(DHT_PIN);

  setupWiFi();
  setupSinricPro();
}

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