Tanvir capstone

#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266HTTPClient.h>
#include <TinyGPS++.h> // library for GPS module
#include <SoftwareSerial.h>
TinyGPSPlus gps;  // The TinyGPS++ object

SoftwareSerial ss(4, 5); // The serial connection to the GPS device

float latitude , longitude;
String date_str , time_str , lat_str , lng_str;



/* Set these to your desired credentials. */
const char *ssid = "Tanvir";  //ENTER YOUR WIFI SETTINGS
const char *password = "tanvir4321";



//=======================================================================
//                    Power on setup
//=======================================================================

void setup() {
  delay(1000);
  Serial.begin(9600);
  WiFi.mode(WIFI_OFF);        //Prevents reconnection issue (taking too long to connect)
  delay(1000);
  WiFi.mode(WIFI_STA);        //This line hides the viewing of ESP as wifi hotspot

  WiFi.begin(ssid, password);     //Connect to your WiFi router
  Serial.println("");

  Serial.print("Connecting");
  // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  //If connection successful show IP address in serial monitor
  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());  //IP address assigned to your ESP
}

//=======================================================================
//                    Main Program Loop
//=======================================================================
void loop() {




  while (ss.available() > 0){ //while data is available
    if (gps.encode(ss.read())) //read gps data
    {
      if (gps.location.isValid()) //check whether gps location is valid
      {
        latitude = gps.location.lat();
        lat_str = String(latitude , 6); // latitude location is stored in a string
        longitude = gps.location.lng();
        lng_str = String(longitude , 6); //longitude location is stored in a string

        Serial.println(latitude);


     HTTPClient http;    //Declare object of class HTTPClient

     String ADCData, station, postData;
     int adcvalue=analogRead(A0);  //Read Analog value of LDR



    //Post Data
      postData = "lat=" + lat_str + "&long=" + lng_str +"&submit=enter";

     http.begin("https://3e50a5b55040.ngrok.io/insertlatlong.php");              //Specify request destination
     http.addHeader("Content-Type", "application/x-www-form-urlencoded");    //Specify content-type header

     //int httpCode = http.POST("logical_id=a&submit=enter");
     int httpCode = http.POST(postData);   //Send the request
     String payload = http.getString();    //Get the response payload

     Serial.println(httpCode);   //Print HTTP return code
     Serial.println(payload);    //Print request response payload

     http.end();  //Close connection

     delay(5000);  //Post Data at every 5 seconds

      }

}
   } //end while



}