Project tutorial
Location Display With Idiotware Shield

Location Display With Idiotware Shield © GPL3+

In this project, I am going to demonstrate how to display location using the ESP8266 wifi module.

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About this project

Working

In this example we are using ESP8266 wifi module and OLED display, to display location using your IP address. We will hit the URL idiotware.herokuapp.com and ask this “getCityCountryByIP” to get Country and city name.

  • In this Code we have used ELClient.h library to get data from “idiotware.herokuapp.com" and "U8glib.h" to display this information on OLED display.
  • u8g.drawStr(1,20,"Where am I ??") is used to display text on OLED
  • The function get_Location() will get you the Country and City using ESP8266 IP address.
  • Once we get the City and Country we will display this using following line u8g.print(countryCode) and u8g.print(city).

Esp8266-01 Configuration

You will need to upload esp link firmware to esp8266-01 module to configure wifi ssid and password. Visit this link for more information: https://github.com/jeelabs/esp-link

Configuring idIoTware shield

Once you upload the code you will see the oled display showing the current location with city and country name.

For example:

Note!

The Arduino sends request only one time after power, If you find that OLED is still showing searching, please reset the Arduino. This will send another request to the idiotware.herokuapp.com for getting IP address.

Now you have your own location tracking device that show's your location by IP address. No more connecting things to breadboard and messy wiring. With the Idiotware shield the sky's the limit.

Code

location_DisplayArduino
/*
              Location Display
   In this example we are using ESP8266 wifi module and OLED display
 to display location using your IP address.
                         
*/



#include "U8glib.h"
#include <ELClient.h>
#include <ELClientRest.h>
char buff[32];
String location = "";
U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_NONE|U8G_I2C_OPT_DEV_0);
// Initialize a connection to esp-link using the normal hardware serial port both for
// SLIP and for debug messages.
ELClient esp(&Serial, &Serial);

// Initialize a REST client on the connection to esp-link
ELClientRest rest(&esp);
int x=0;
boolean wifiConnected = false;

// Callback made from esp-link to notify of wifi status changes
// Here we print something out and set a global flag
void wifiCb(void *response) 
    {
      ELClientResponse *res = (ELClientResponse*)response;
      if (res->argc() == 1) 
         {
           uint8_t status;
           res->popArg(&status, 1);

           if(status == STATION_GOT_IP) 
             {
               Serial.println("WIFI CONNECTED");  //Wifi gets connected at this place
               wifiConnected = true;
             } 
           else 
             { 
                u8g.firstPage();
              do { u8g.setFont(u8g_font_timB10); 
                   u8g.drawStr(1,13,"WIFI DISCONNECTED!!");
                 } while( u8g.nextPage() );
               Serial.print("WIFI NOT READY: ");//Wifi not connected,check connection
               Serial.println(status);
               wifiConnected = false;
                
            
             }
         }
    }

void setup() 
    {
      Serial.begin(9600);   // the baud rate here needs to match the esp-link config
      Serial.println("EL-Client starting!");
      
      u8g.setColorIndex(1);
      // Sync-up with esp-link, this is required at the start of any sketch and initializes the
      // callbacks to the wifi status change callback. The callback gets called with the initial
      // status right after Sync() below completes.
      esp.wifiCb.attach(wifiCb); // wifi status change callback, optional (delete if not desired)
      bool ok;
      do 
       {
         ok = esp.Sync();      // sync up with esp-link, blocks for up to 2 seconds
         if (!ok) Serial.println("EL-Client sync failed!");
       } while(!ok);
      Serial.println("EL-Client synced!");

      // Get immediate wifi status info for demo purposes. This is not normally used because the
      // wifi status callback registered above gets called immediately. 
      esp.GetWifiStatus();
      ELClientPacket *packet;
      if((packet=esp.WaitReturn()) != NULL) 
        {
          Serial.print("Wifi status: ");
          Serial.println(packet->value);
        }

      // Set up the REST client to talk to idiotware.herokuapp.com, this doesn't connect to that server,
      // it just sets-up stuff on the esp-link side
      int err = rest.begin("idiotware.herokuapp.com");
      if(err != 0) 
        {
          Serial.print("REST begin failed: ");
          Serial.println(err);
          while(1) ;
        }
      Serial.println("EL-REST ready");
      u8g.firstPage();
              do { u8g.setFont(u8g_font_timB14); 
                   u8g.drawStr(1,20,"Where am I ??");
                   u8g.setFont(u8g_font_timB10); 
                   u8g.drawStr(1,40,"Searching");
                   u8g.drawStr(65,40,"....");
                   
                 } while( u8g.nextPage() );
     // delay(2000);
      
      get_Location();      
      
    }

void loop() 
    {
     
    }
 
    
void get_Location()
    { 
      sprintf(buff, "/getCityCountryByIP");
           // process any callbacks coming from esp_link
      esp.Process();

     
      // if we're connected make an HTTP request
      if(wifiConnected) 
        {
          // Request /utc/now from the previously set-up server
          rest.get((const char*)buff);

          char response[20];
          uint16_t code = rest.waitResponse(response, 20);
          if(code == HTTP_STATUS_OK)     //check for response for HTTP request  
            {
              Serial.println("ARDUINO: GET successful:");
              location = response;
              int commaPositon = location.indexOf(',');
              String city= "";
              city=location.substring(0, commaPositon);  //copy city from recived location to variable city
              String countryCode = "";
              countryCode=location.substring(commaPositon+2);//copy country code from recived location to variable countryCode
              u8g.firstPage();
              do { u8g.setFont(u8g_font_timB10);
                   u8g.drawStr(1,10,"City:");
                   u8g.setFont(u8g_font_timB14); 
                   u8g.setPrintPos(5, 30);
                   u8g.print(city);
                   u8g.setFont(u8g_font_timB10);
                   u8g.drawStr(1,45,"Country:");
                   u8g.setFont(u8g_font_timB14);
                   u8g.setPrintPos(5, 64);
                   u8g.print(countryCode);
                 } while( u8g.nextPage() );
            } 
          else 
            {
              Serial.print("ARDUINO: GET failed: ");
              Serial.println(code);
            }
          delay(5000);
        }
        
    }   

Schematics

idiotware-shield

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