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<code>
#include <ESP8266WiFi.h>
#include "DHT.h"
#define DHTPIN          2   //Pin to attach the DHT
#define DHTTYPE DHT11       //type of DTH
const char* ssid     = "Your SSID";
const char* password = "Your password";
const int sleepTimeS = 600; //18000 for Half hour, 300 for 5 minutes etc.

///////////////Weather////////////////////////
char server [] = "weatherstation.wunderground.com";
char WEBPAGE [] = "GET /weatherstation/updateweatherstation.php?";
char ID [] = "YourWeatherID";
char PASSWORD [] = "YourPasswordOfWunderground";

/////////////IFTTT///////////////////////
const char* host = "maker.ifttt.com";//dont change
const String IFTTT_Event = "YourEventName";
const int puertoHost = 80;
const String Maker_Key = "YourMakerKey";
String conexionIF = "POST /trigger/"+IFTTT_Event+"/with/key/"+Maker_Key +" HTTP/1.1\r\n" +
                    "Host: " + host + "\r\n" +
                    "Content-Type: application/x-www-form-urlencoded\r\n\r\n";
//////////////////////////////////////////
DHT dht(DHTPIN, DHTTYPE);

void setup()
{
  Serial.begin(115200);
  dht.begin();
  delay(1000);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void loop(){
  //Check battery
  int level = analogRead(A0);
  level = map(level, 0, 1024, 0, 100);
  if(level<50)
  {
   mandarNot(); //Send IFTT
   Serial.println("Low batter");
   delay(500);
  }
  //Get sensor data
  float tempc = dht.readTemperature();
  float tempf =  (tempc * 9.0)/ 5.0 + 32.0;
  float humidity = dht.readHumidity();
  float dewptf = (dewPoint(tempf, dht.readHumidity()));
  //check sensor data
  Serial.println("+++++++++++++++++++++++++");
  Serial.print("tempF= ");
  Serial.print(tempf);
  Serial.println(" *F");
  Serial.print("tempC= ");
  Serial.print(tempc);
  Serial.println(" *C");
  Serial.print("dew point= ");
  Serial.println(dewptf);
  Serial.print("humidity= ");
  Serial.println(humidity);

//Send data to Weather Underground
  Serial.print("connecting to ");
  Serial.println(server);
  WiFiClient client;
  if (!client.connect(server, 80)) {
    Serial.println("Conection Fail");
    return;
  }
    client.print(WEBPAGE);
    client.print("ID=");
    client.print(ID);
    client.print("&PASSWORD=");
    client.print(PASSWORD);
    client.print("&dateutc=");
    client.print("now");
    client.print("&tempf=");
    client.print(tempf);
    client.print("&dewptf=");
    client.print(dewptf);
    client.print("&humidity=");
    client.print(humidity);
    client.print("&softwaretype=ESP%208266O%20version1&action=updateraw&realtime=1&rtfreq=2.5");
    client.println();
    delay(2500);
    sleepMode();

}

double dewPoint(double tempf, double humidity) //Calculate dew Point
{
  double A0= 373.15/(273.15 + tempf);
  double SUM = -7.90298 * (A0-1);
  SUM += 5.02808 * log10(A0);
  SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
  SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
  SUM += log10(1013.246);
  double VP = pow(10, SUM-3) * humidity;
  double T = log(VP/0.61078);
  return (241.88 * T) / (17.558-T);
}

void mandarNot(){
  WiFiClient client;
  if (!client.connect(host, puertoHost)) //Check connection
  {
    Serial.println("Failed connection");
    return;
  }
  client.print(conexionIF);//Send information
  delay(10);
  while(client.available())
  {
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }
}

void sleepMode(){
  Serial.print(F("Sleeping..."));
  ESP.deepSleep(sleepTimeS * 1000000);
}

</code>

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