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NodeMCU-ESP8266

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- Establishing a Wi-Fi connection

 #include <ESP8266WiFi.h>        // Include the Wi-Fi library

  const char* ssid     = "SSID";         // The SSID (name) of the Wi-Fi network you want to connect to
  const char* password = "PASSWORD";     // The password of the Wi-Fi network

  void setup()
   {
     Serial.begin(115200);         // Start the Serial communication to send messages to the computer
      delay(10);
      Serial.println('\n');

      WiFi.begin(ssid, password);             // Connect to the network
      Serial.print("Connecting to ");
      Serial.print(ssid); Serial.println(" ...");

      int i = 0;
       while (WiFi.status() != WL_CONNECTED)
       { // Wait for the Wi-Fi to connect
         delay(1000);
         Serial.print(++i); Serial.print(' ');
       }

    Serial.println('\n');
    Serial.println("Connection established!");  
    Serial.print("IP address:\t");
    Serial.println(WiFi.localIP());         // Send the IP address of the ESP8266 to the computer
   }

  void loop()  
  { }

- Access Point mode

    #include <ESP8266WiFi.h>        // Include the Wi-Fi library

     const char *ssid = "ESP8266 Access Point"; // The name of the Wi-Fi network that will be created
     const char *password = "thereisnospoon";   // The password required to connect to it, leave blank for an open network

     void setup() 
     {
          Serial.begin(115200);
          delay(10);
          Serial.println('\n');

           WiFi.softAP(ssid, password);             // Start the access point
          Serial.print("Access Point \"");
          Serial.print(ssid);
          Serial.println("\" started");

          Serial.print("IP address:\t");
          Serial.println(WiFi.softAPIP());         // Send the IP address of the ESP8266 to the computer
     }

     void loop()
     { 
     }

- Establishing a web Server

     #include <ESP8266WiFi.h>        // Include the Wi-Fi library
     #include <ESP8266WebServer.h>

     const char* ssid = "ABbkareno Wifi";
     const char* password = "12345678";  //Enter Password here
     ESP8266WebServer server(80);


    void setup()
        {
          Serial.begin(115200);         // Start the Serial communication to send messages to the computer
          WiFi.mode(WIFI_AP);

          WiFi.softAP(ssid, password);

          IPAddress myIP = WiFi.softAPIP();
          Serial.print("AP IP address: ");
           Serial.println(myIP);

         // Starting WEB-server 
          server.begin();
           Serial.println("HTTP server started"); 
       }

    void loop()
       {
       }

- Establishing a web Server Create HTML

          #include <SoftwareSerial.h>
          #include <ESP8266WiFi.h>       
          #include <ESP8266WebServer.h>
          
          //Server name and password
          const char* ssid = "ABbkareno Wifi";
           const char* password = "12345678";  //Enter Password here
          ESP8266WebServer server(80);

          String header;
          
           void setup() 
           {
             Serial.begin(115200);  
             
               // Server Start code
               WiFi.mode(WIFI_AP);
               WiFi.softAP(ssid, password);
                IPAddress myIP = WiFi.softAPIP();
               Serial.print("AP IP address: ");
                Serial.println(myIP);
               // Starting WEB-server
               server.begin();
               Serial.println("HTTP server started");
               
               void loop() 
               {
               }


               String SendHTML() {

               String value = server.arg("value"); //this lets you access a query param (http://x.x.x.x/action1?value=1)
                 int number = value.toInt(); 
                 String s = " <!DOCTYPE html> <html>";
                 s += "<head><meta name='viewport' content='width=device-width, initial-scale=1'> <title>GPS DATA</title> <style>";
                 s += "<style>html, body { font-family: Helvetica; display: block; margin: 0px auto; text-align: center;}";
                 s += ".button { background-color: #209e48; border: none; color: white; padding: 12px 24px;";
                 s += "text-decoration: none; font-size: 20px; margin: 2px; cursor: pointer;}";
                 s += ".button2 {background-color: #c20a0a;}";
                 s += ".textbox {width: 80px; border: 1px solid #333; padding: 16px 20px 0px 24px; background-image: linear-gradient(180deg, #fff, #ddd 40%, #ccc);}";
                 s += ".mytext {font-size: 16px; font-weight:bold; font-family:Arial ; text-align: justify;}";
                  s += "#container {width: 100%; height: 50px; margin-left: 5px; margin-top: 20px; padding: 10px; display: -webkit-flex; -webkit-justify-content: center; display: flex; justify-content: center;} ";

                 s += "a:link {background-color: YELLOW;text-decoration: none;}";
                 s += "table, th, td </style> </head> <body> <h1  style=";
                 s += "font-size:300%;";
                 s += " ALIGN=CENTER> GPS DATA</h1>";
                 s += "<p ALIGN=CENTER style=""font-size:150%;""";
                  s += "> <b>Location Details</b></p> <table ALIGN=CENTER style=";
                 s += "width:50%";
                  s += "> <tr> <th>Latitude</th>";
                  s += "<td ALIGN=CENTER >";

                  s += "</td> </tr> <tr> <th>Longitude</th> <td ALIGN=CENTER >";

                  s += "</td> </tr> <tr>  <th>Date</th> <td ALIGN=CENTER >";

                   s += "</td></tr> <tr> <th>Time</th> <td ALIGN=CENTER >";

                   s += "</td>  </tr> </table> ";


                   s += "</body> </html>";
                    return s;
                     }