Designing ESP8266 weather station using 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 Characters

 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;

 //connection to host website to fetch the weather data

 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);

 }

 }

 ### 

Circuit Diagram-ESP8266-OpenWeatherMap Based Weather Station