#include 
#include 
#include 
#include 
#include //修改WIFI名稱以及密碼
const char* ssid = "**";//WIFI名稱
const char* password = "**";//WIFI密碼
String openWeatherMapApiKey = "***";//Open weather app ID
double time_utc=0;
double lat=34;// 默認緯度
double lon=113;//默認經(jīng)度
//設置獲取信息的間隔時間，以下用于測試所以設置為10秒
//您應當根據(jù)你需要獲取數(shù)據(jù)的網(wǎng)站，規(guī)定時間內(nèi)訪問數(shù)據(jù)的次數(shù)上限來限制訪問時間的最小間隔
unsigned long lastTime = 0;
//設置每10分鐘獲得一次天氣數(shù)據(jù)
//unsigned long timerDelay = 600000;
//設置每10秒獲得一次天氣數(shù)據(jù)
unsigned long timerDelay = 10000;

LiquidCrystal_PCF8574 lcd(0x27); // set the LCD address to 0x27 for a 16 chars and 2 line display

String jsonBuffer;
String lineData="";
int show = -1;
String comdata="";
void setup()
{
  
  
  int error;

  Serial.begin(115200);
  Serial.println("LCD...");
  Serial1.begin(115200,SERIAL_8N1,/*rx =*/20,/*Tx =*/21);  

  // wait on Serial to be available on Leonardo
  while (!Serial&&!Serial1)
    ;
  
  WiFi.begin(ssid, password);
  Serial.println("Connecting WIFI...");
  //判斷WIFI是否連接
  while(WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());
  Serial.println("Timer set to 10 seconds (timerDelay variable), it will take 10 seconds before publishing the first reading.");


  Serial.println("Dose: check for LCD");

  Wire.begin();
  Wire.beginTransmission(0x27);
  error = Wire.endTransmission();
  Serial.print("Error: ");
  Serial.print(error);

  if (error == 0) {
    Serial.println(": LCD found.");
    show = 0;
    lcd.begin(16, 2); // initialize the lcd

  } else {
    Serial.println(": LCD not found.");
  } // if
  //lcd.print("WIFI&I2C&SERIAL OK");
  lcd.setBacklight(0);
  delay(400);
  lcd.setBacklight(255);
  lcd.home();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("WIFI&SCREEN&GNSS");
  lcd.setCursor(0, 1);
  lcd.print("IS READY!");
  lcd.noBlink();
  lcd.noCursor();
  delay(1000);

} // setup()

void loop()
{
  while(Serial1.available()>0)
  {
    lineData=char(Serial1.read());
    comdata+=lineData;
    delay(2);
  }
  if (comdata.length()>0)
  {
    Serial.println(comdata);
    int ic=comdata.indexOf('*');
    
    String tmp=comdata.substring(1,ic);
    if(tmp.substring(0,5)==("GNGGA"))
    {
      lcd.home();
      lcd.clear();
      lcd.setCursor(0, 0);

      time_utc=tmp.substring(6,16).toDouble()+80000;
      if (time_utc>240000)
        time_utc-=240000;
      Serial.println("T="+String(time_utc));  
      lcd.print("T="+String(time_utc)); 
      
      lat=tmp.substring(17,19).toDouble()+tmp.substring(19,27).toDouble()/60;
      lon=tmp.substring(30,33).toDouble()+tmp.substring(33,41).toDouble()/60;
      
      Serial.println("Lat="+String(lat));
      Serial.println("Lon="+String(lon));
      
      lcd.setCursor(0, 1);
      lcd.print("B="+String(lat).substring(0,6)+" L="+String(lon).substring(0,7));
      //Serial.println("$GNGGA detected..");
    }
      
    
    comdata="";
  }
   //發(fā)送HTTP獲取請求
  if ((millis() - lastTime) > timerDelay) {
    //檢測WIFI是否已經(jīng)連接
    if(WiFi.status()== WL_CONNECTED){
      //String serverPath = "http://api.openweathermap.org/data/2.5/weather?q=" + city + "," + countryCode + "&appid=" + openWeatherMapApiKey;
      String serverPath = "http://api.openweathermap.org/data/2.5/weather?lat=" + String(lat) + "&lon=" + String(lon) + "&appid=" + openWeatherMapApiKey;      //將組合好的URL放入httpGETRequest函數(shù)中通過HTTP獲取請求以獲得文本
      jsonBuffer = httpGETRequest(serverPath.c_str());
      Serial.println(jsonBuffer);

      //將解析的Json對象值儲存在Jsonu緩沖區(qū)中
      JSONVar myObject = JSON.parse(jsonBuffer);

      //判斷解析是否成功
      if (JSON.typeof(myObject) == "undefined") {
        Serial.println("Parsing input failed!");
        return;
      }

      Serial.print("JSON object = ");
      Serial.println(myObject);
      Serial.print("Temperature: ");
      //獲取到的溫度其實是開氏度。
      //開氏度 = 攝氏度+273.15
      double c = myObject["main"]["temp"];
      c = c-273.15;
      Serial.println(c);
      
      lcd.home();
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.print("T="+String(c)+" ");
      
      Serial.print("Pressure: ");
      //myObject["main"]["pressure"]前為{}前的引號內(nèi)容，后為讀取哪一個引號后數(shù)據(jù)
      Serial.println(myObject["main"]["pressure"]);
      Serial.print("Humidity: ");
      Serial.println(myObject["main"]["humidity"]);

      double pres=myObject["main"]["pressure"];
      lcd.print("P="+String(pres));
      
      Serial.print("Wind Speed: ");
      Serial.println(myObject["wind"]["speed"]);

      lcd.setCursor(0, 1);
      double wind=myObject["wind"]["speed"];
      lcd.print("Wind="+String(wind)+" ");

      double Hu=myObject["main"]["humidity"];
      lcd.print("H="+String(Hu));
    }
    else {
      Serial.println("WiFi Disconnected");
    }
    lastTime = millis();
  }
} // loop()

String httpGETRequest(const char* serverName) {
  WiFiClient client;
  HTTPClient http;

  //連接網(wǎng)址
  http.begin(client, serverName);

  //發(fā)送HTTP站點請求
  int httpResponseCode = http.GET();

  //該數(shù)組用于儲存獲得的數(shù)據(jù)
  String payload = "{}";

  //將獲得的數(shù)據(jù)放入數(shù)組
  if (httpResponseCode>0) {
    Serial.print("HTTP Response code: ");
    Serial.println(httpResponseCode);
    payload = http.getString();
  }
  else {
    Serial.print("Error code: ");
    Serial.println(httpResponseCode);
  }

  //釋放資源
  http.end();

  //返回獲得的數(shù)據(jù)用于Json處理
  return payload;
}