Projetando estação meteorológica ESP8266 usando OpenWeatherMap

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//Program to

//Libraries for ESP, json and I2C LCD

#include 

#include 

#include 

#include  


WiFiClient client;

WiFiClientSecure sclient;

LiquidCrystal_I2C lcd(0x20,16,2);


//Initialize the Variable for storing the data

String weatherMain = "";

String weatherDescription = "";

String weatherLocation = "";

String country;

int humidity;

int pressure;

int temp;

int tempMin, tempMax;

int clouds;

int windSpeed;

String weatherString;


char tempT(5),tempMinT(5),tempMaxT(5);

char humi(5),presS(5),cloudS(5),WindSpeed(5);


//WiFi Name and Password

const char* ssid     = "********";      // SSID of local network

const char* password = "********";    // Password on network


//openweathermap.org api key:8b2f088e8a9c307c759ef39dcb085ae4

String weatherKey  = "8b2f088e8a9c307c759ef39dcb085ae4";   // openweathermap.org key

String weatherLang = "&lang=en";  //  english or other language


//LCD display of Special Charcters

byte up(8) = {

                      0b00100,

                      0b01110,

                      0b10101,

                      0b00100,

                      0b00100,

                      0b00100,

                      0b00100,

                      0b00000

                    };

  byte down(8) = {

                        0b00000,

                        0b00100,

                        0b00100,

                        0b00100,

                        0b00100,

                        0b10101,

                        0b01110,

                        0b00100

                      };           



void setup  

{

  Wire.begin(2, 0);

  //Baud rate for serial communication

  Serial.begin(115200);

  // initializing the LCD

  lcd.init ; 

  //Enable or turn on the text

  lcd.display ; 

  // Enable or Turn On the backlight 

  lcd.backlight ; 

  lcd.createChar(1,up);

  lcd.createChar(2,down);

  Serial.print("Connecting to WiFi ");

  lcd.setCursor(0,0);

  lcd.print("Connecting to...");

  lcd.setCursor(0,1);

  lcd.print("      WiFi      ");

  WiFi.begin(ssid, password);

  while (WiFi.status  != WL_CONNECTED)

  {

    delay(500);

    Serial.print(".");

  }

  lcd.clear ;

  delay(2000);

  Serial.println("");

  Serial.print("MyIP: "); Serial.println(WiFi.localIP );

  lcd.setCursor(0,0);

  lcd.print("MY Local IP: "); 

  lcd.setCursor(0,1);

  lcd.println(WiFi.localIP );

  delay(4000);

  lcd.clear ;

}


void loop 

{

  

   getWeatherData ;

   delay(5000);

}


const char *weatherHost = "api.openweathermap.org";


void getWeatherData 

{

  Serial.print("connecting to "); Serial.println(weatherHost);

  delay(4000);

  lcd.clear ;

  //connetion to host website to fetch the weather datas

  if (client.connect(weatherHost, 80))

  {

    client.println(String("GET /data/2.5/weather?q=erode,india&") + "&units=metric&apprn" +

                "Host: " + weatherHost + "rnUser-Agent: ArduinoWiFi/1.1rn" +

                "Connection: closernrn");

  }

  else

  {

    Serial.println("connection failed");

    return;

  }

  String line;

  int repeatCounter = 0;

  while (!client.available  && repeatCounter < 10)

  {

    delay(500);

    Serial.println("w.");

    repeatCounter++;

  }

  while (client.connected  && client.available )

  {

    char c = client.read ; 

    if (c == '('    c == ')') c=" ";

    line += c;

  }


  client.stop ;


  DynamicJsonBuffer jsonBuf;

  JsonObject &root = jsonBuf.parseObject(line);

  if (!root.success )

  {

    Serial.println("parseObject  failed");

    return;

  }


  weatherDescription = root("weather")("description").as ;

  weatherDescription.toLowerCase ;

  temp = root("main")("temp");

  humidity = root("main")("humidity");

  pressure = root("main")("pressure");

  tempMin = root("main")("temp_min");

  tempMax = root("main")("temp_max");

  windSpeed = root("wind")("speed");

  clouds = root("clouds")("all");

  Serial.println(String("temp=")+temp);

  Serial.println(String("temp_min=")+tempMin);

  Serial.println(String("temp_max=")+tempMax);

  Serial.println(String("pressure=")+pressure);

  Serial.println(String("humidity=")+humidity);

  Serial.println(String("wind_speed=")+windSpeed);

  Serial.println(String("clouds=")+clouds);

  lcd.setCursor(0,0);

  lcd.print("TEMP:"); 

  lcd.setCursor(5,0);

  lcd.print(temp);

  lcd.setCursor(7,0);

  lcd.print(",");

  lcd.setCursor(8,0);

  lcd.print(tempMin);

  lcd.setCursor(10,0);  

  lcd.write(2);

  lcd.setCursor(11,0);

  lcd.print(",");

  lcd.setCursor(12,0);

  lcd.print(tempMax);

  lcd.setCursor(14,0);  

  lcd.write(1);

  pressHumiCloud ;

}


void pressHumiCloud 

{

  lcd.setCursor(2,1);

  lcd.print("Pressure:"); 

  lcd.setCursor(11,1);

  printDigits2(pressure);

  delay(1000);

  lcd.setCursor(0,1);

  lcd.print("                ");

  lcd.setCursor(2,1);

  lcd.print("Humidity:"); 

  lcd.setCursor(11,1);

  printDigits2(humidity);

  lcd.print("%");

  delay(1000);

  lcd.setCursor(0,1);

  lcd.print("                ");

  lcd.setCursor(1,1);

  lcd.print("WindSpeed:"); 

  lcd.setCursor(11,1);

  printDigits2(windSpeed);

  lcd.print("m/s");

  delay(1000);

  lcd.setCursor(0,1);

  lcd.print("                ");

  lcd.setCursor(2,1);

  lcd.print("Clouds:"); 

  lcd.setCursor(9,1);

  printDigits2(clouds);

  lcd.print("%"); 

  delay(1000);

}


//this void function is really useful; it adds a "0" to the beginning of the number, 

//so that 5 minutes is displayed as "05", rather than "5 "

void printDigits2(int digits)  

{

  if(digits < 1000) 

  {

    lcd.print("0");

    lcd.print(digits);

  }

  else

  {

    lcd.print(digits);

  }

}

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Diagrama de circuito-ESP8266-Estação meteorológica baseada em OpenWeatherMap