/*

    8/7/17 The Soldering Station
    8/7/17 Adafruit Huzzah ESP8266 Weather Station With Sensiron SHT31-D Temperature & Humidity Sensor Posting To Dweet
    8/9 - Added battery check
    8/13 - Adding posting to Weather Underground  https://www.wunderground.com/personal-weather-station/dashboard?ID=KNCRALEI304
    8/20 Finally got Wunderground working.
    8/23 Added dewpoint
*/

#include <ESP8266WiFi.h>
#include <Arduino.h>
#include <Wire.h>
#include "Adafruit_SHT31.h"
#include <WiFiClientSecure.h>
#include <ESP8266HTTPClient.h>

Adafruit_SHT31 sht31 = Adafruit_SHT31();

// WiFi Login
const char* ssid     = “xxxxxx”;
const char* password = “xxxxxx”;

// Wunderground Login
char ID [] = “xxxxxxx”;
char PASSWORD [] = “xxxxxx”;

const char* host = "dweet.io";
const int httpsPort = 443;
const char* host2 = "rtupdate.wunderground.com";


const int sleepTimeS = 360; // 10 = 10 seconds 180 = 3 minutes 360 = 6 minutes
float t = 0.0;
float h = 0.0;
float f = 0.0;
int value = 0;
int tem = 0;
int hum = 0;
int level = 0;
int dewptf = 0;
int dew = 0;

void setup() {
  Serial.begin(115200);
  delay(100);
  Serial.println(F("Feather ESP8266 Wifi Weather Station Vs 7"));

  Serial.println();
  Serial.print(F("Connecting to "));
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println(F("WiFi connected"));
  Serial.println(F("IP address: "));
  Serial.println(WiFi.localIP());

  if (! sht31.begin(0x44)) {
    Serial.println(F("Couldn't find SHT31"));
    while (1) delay(1);
  }

}

void loop() {

  getWeather();
  dewptf = (dewpointCalc(f, h));
  dew = dewptf;
  battery_level();
  postData();
  delay(90);

  // uncomment line below to send data to Wunderground
  //senddataWU();

  // data posted - reset variables
  t = 0.0;
  f = 0.0;
  h = 0.0;
  level = 0;
  sleepTime();
}

void sleepTime() {
  Serial.println(F("ESP8266 in sleep mode"));
  ESP.deepSleep(sleepTimeS * 1000000);
}

void getWeather() {
  for (int i = 0; i < 3; i++) { // get avg of 3 readings
    t = t + sht31.readTemperature();
    h = h + sht31.readHumidity();
    delay(5);
  }
  t = t / 3;
  h = h / 3;
  Serial.println(F(""));
  if (! isnan(t)) {  // check if 'is not a number'
    Serial.print(F("Temp *C = "));
    Serial.println(t);
  } else {
    Serial.println(F("Failed to read temperature"));
  }
  f = (t * 1.8) + 32;
  Serial.print(F("Temp F = "));
  Serial.println(f);

  if (! isnan(h)) {  // check if 'is not a number'
    Serial.print(F("Hum. % = "));
    Serial.println(h);
  } else {
    Serial.println(F("Failed to read humidity"));
  }
  Serial.println(F(""));
  tem = (int)f;
  hum = (int)h;

}

void postData() {

  Serial.print("Connecting to ");
  Serial.println(host);

  WiFiClientSecure client;
  //const int httpPort = 80;
  if (!client.connect(host, httpsPort)) {
    Serial.println(F("Connection failed"));
    return;
  }

  HTTPClient http;
  char temp[500];
  snprintf (temp, 500, "{\"Temperature\":%02d,\"Humidity\":%02d,\"Dewpoint\":%02d,\"Battery\":%2d}", tem, hum, dew, level);
  Serial.print(F("Posting data..."));
  Serial.println(temp);
  http.begin("http://dweet.io/dweet/for/xxxxxx?”);
  http.addHeader("Content-Type", "application/json");

  int  httpCode = http.POST(temp);

  if (httpCode == 204 || httpCode == 200 || httpCode == -11)
    Serial.println(F("Successful posting of data"));
  else
    Serial.println (httpCode);

  http.end();
  Serial.println(F(""));
  Serial.println(F("-----------------------------"));
  Serial.println(F(""));

}

void battery_level() {

  for (int i = 0; i < 3; i++) { // get avg of 3 readings
    level = level + analogRead(A0);
    delay(2);
  }
  level = level / 3;

  // convert battery level to percent
  level = map(level, 580, 758, 0, 100);

  // bit of a kludge  fully charged battery shows up as 75-76%
  // Add 21 to to get ~ real battery level
  level = level + 21;
  if (level >= 100)
    level = 100;
}

void senddataWU()
{

  Serial.print(F("Connecting to "));
  Serial.println(host2);
  Serial.println(F("Sending data."));

  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(host2, httpPort)) {
    Serial.println(F("connection failed"));
    //  startwifi();
    return;
  }

  String url = "/weatherstation/updateweatherstation.php?ID=";
  url += ID;
  url += "&PASSWORD=";
  url += PASSWORD;
  url += "&dateutc=now";
  url += "&tempf=";
  url += tem;
  url += "&humidity=";
  url += hum;
  url += "&dewptf=";
  url += dewptf;
  url += "&softwaretype=Arduino-ESP8266&action=updateraw&realtime=1&rtfreq=2.5";

  Serial.print(F("Requesting URL: "));
  Serial.println(url);

  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" +
               "Connection: close\r\n\r\n");
  delay(10);

  while (client.available()) {
    String line = client.readStringUntil('\r');
    Serial.print(line);
    delay(10);
  }
  Serial.println();
  Serial.println(F("Closing connection"));
}


int dewpointCalc(int tempf, int humidity) {

return (tem - (.36 * (100 - hum)));


}