esp8266-OWM-i2c.ino

#include <LiquidCrystal_I2C.h>
#include <ESP8266WiFi.h>
#include <ArduinoJson.h>
#include <Wire.h> 

LiquidCrystal_I2C lcd(0x27, 16, 2); // If it doesn't work change "0x27" with another address according to your i2c lcd.

const char* ssid     = "your_ssid";      // SSID of local network
const char* password = "your_password";   // Password on network
String APIKEY = "your_openweathermap_api_key";
String CityID = "746881"; //Your city id. search your city in OpenWeatherMap.org and just copy the numbers from URL to find your cityID

WiFiClient client;
char servername[]="api.openweathermap.org";  // remote server we will connect to
String result;

int  counter = 30; // refresh every 5 min.

String weatherDescription ="";
String weatherLocation = "";
String Country;
float Temperature;
float Humidity;
float Pressure;


void setup() {
  Serial.begin(115200);
  int cursorPosition=0;
  lcd.begin();
  lcd.backlight();
  lcd.print("   Connecting");  
  Serial.println("Connecting");
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    lcd.setCursor(cursorPosition,2); 
    lcd.print(".");
    cursorPosition++;
  }
  lcd.clear();
  lcd.print("   Connected!");
  Serial.println("Connected");
  delay(1000);

}

void loop() {
    if(counter == 30) //Get new data every 10 minutes
    {
      counter = 0;
      displayGettingData();
      delay(1000);
      getWeatherData();
    }else
    {
      counter++;
      displayWeather(weatherLocation,weatherDescription);
      delay(5000);
      displayConditions(Temperature,Humidity,Pressure);
      delay(5000);
    }
}

void getWeatherData() //client function to send/receive GET request data.
{
  if (client.connect(servername, 80)) {  //starts client connection, checks for connection
    client.println("GET /data/2.5/weather?id="+CityID+"&units=metric&APPID="+APIKEY);
    client.println("Host: api.openweathermap.org");
    client.println("User-Agent: ArduinoWiFi/1.1");
    client.println("Connection: close");
    client.println();
  } 
  else {
    Serial.println("connection failed"); //error message if no client connect
    Serial.println();
  }

  while(client.connected() && !client.available()) delay(1); //waits for data
  while (client.connected() || client.available()) { //connected or data available
    char c = client.read(); //gets byte from ethernet buffer
      result = result+c;
    }

  client.stop(); //stop client
  result.replace('[', ' ');
  result.replace(']', ' ');
  Serial.println(result);

char jsonArray [result.length()+1];
result.toCharArray(jsonArray,sizeof(jsonArray));
jsonArray[result.length() + 1] = '\0';

StaticJsonBuffer<1024> json_buf;
JsonObject &root = json_buf.parseObject(jsonArray);
if (!root.success())
{
  Serial.println("parseObject() failed");
}

String location = root["name"];
String country = root["sys"]["country"];
float temperature = root["main"]["temp"];
float humidity = root["main"]["humidity"];
String weather = root["weather"]["main"];
String description = root["weather"]["description"];
float pressure = root["main"]["pressure"];

weatherDescription = description;
weatherLocation = location;
Country = country;
Temperature = temperature;
Humidity = humidity;
Pressure = pressure;

}

void displayWeather(String location,String description)
{
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(location);
  lcd.print(", ");
  lcd.print(Country);
  lcd.setCursor(0,1);
  lcd.print(description);
}

void displayConditions(float Temperature,float Humidity, float Pressure)
{
  lcd.clear();
  lcd.print("S: "); 
 lcd.print(Temperature,1);
 lcd.print((char)223);
 lcd.print("C ");
 
 //Printing Humidity
 lcd.print(" H:");
 lcd.print(Humidity,0);
 lcd.print(" %");
 
 //Printing Pressure
 lcd.setCursor(0,1);
 lcd.print("P: ");
 lcd.print(Pressure,1);
 lcd.print(" hPa");

}

void displayGettingData()
{
  lcd.clear();
  lcd.print("Getting Data");
}