Merhabalar Gps kodu send_database() functionını kullanmadan çalışıyor fakat onu kullanınca eklediğim resimdeki gibi 0000 olarak geliyor.
Lütfen Yardımcı olursanız sevinirim yarına yetiştirmem gerekiyor bu projeyi.

#ifdef ESP32
  #include <WiFi.h>
  #include <HTTPClient.h>
#else
  #include <ESP8266WiFi.h>
  #include <ESP8266HTTPClient.h>
  #include <WiFiClient.h>
  #include <TinyGPS++.h>
#include <SoftwareSerial.h>
#endif

#include <Wire.h>
#include <HCSR04.h>
#include <LiquidCrystal_I2C.h>
#include <CayenneMQTTESP8266.h>


 
static const int RXPin = 5, TXPin = 16;   // GPIO 4=D2(conneect Tx of GPS) and GPIO 5=D1(Connect Rx of GPS
static const uint32_t GPSBaud = 9600; //if Baud rate 9600 didn't work in your case then use 4800
 
TinyGPSPlus gps;      // The TinyGPS++ object
 
SoftwareSerial mygps(RXPin, TXPin);  // The serial connection to the GPS device
 
 
float latitude;     //Storing the Latitude
float longitude;    //Storing the Longitude
float velocity;     //Variable  to store the velocity
float sats;         //Variable to store no. of satellites response
String bearing;     //Variable to store orientation or direction of GPS
String NMS;
 
//unsigned int move_index;         // moving index, to be used later
unsigned int move_index = 1;       // fixed location for now
 
 // Update HOST URL here

#define HOST "**********"          // Enter HOST URL without "http:// "  and "/" at the end of URL

#define WIFI_SSID "*****"            // WIFI SSID here
#define WIFI_PASSWORD "*********"        // WIFI password here
// Cayenne authentication info. This should be obtained from the Cayenne Dashboard.

char username[] = "*********";

char mqtt_password[] = "*************************";

char client_id[] = "*****";
#define MAX_HEIGHT 24.8 // your bin height
int Percentage_1;
int Percentage_2;
UltraSonicDistanceSensor distanceSensor1(D6, D5); //D1 trig, D2=ech
UltraSonicDistanceSensor distanceSensor2(D2, D3);
int pm;
int p = 0; //looop
WiFiServer server(80);
String sendval, sendval2, sendval3, sendval4, postData;
void setup()
{
  Serial.begin(115200);
  Serial.println();
  mygps.begin(GPSBaud);
  Cayenne.begin(username, mqtt_password, client_id, WIFI_SSID, WIFI_PASSWORD); // starting cayenne
delay(1000);
  WiFi.mode(WIFI_STA);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);                                     //try to connect with wifi
Serial.print("Connecting to ");
Serial.print(WIFI_SSID);
while (WiFi.status() != WL_CONNECTED)
{ Serial.print(".");
    delay(500); }


Serial.println();
Serial.print("Connected to ");
Serial.println(WIFI_SSID);
Serial.print("IP Address is : ");
Serial.println(WiFi.localIP());    //print local IP address

delay(30);
}
 
 
void loop()
{

 
  if(WiFi.status()== WL_CONNECTED){
 while (mygps.available() > 0){
  {
    
    // sketch displays information every time a new sentence is correctly encoded.
    if (gps.encode(mygps.read()))
      displayInfo();

      
    Serial.print("SATS:  ");
    Serial.println(sats);  // float to x decimal places
    Serial.print("LATITUDE:  ");
    Serial.println(latitude, 6);  // float to x decimal places
    Serial.print("LONGITUDE: ");
    Serial.println(longitude, 6);
    Serial.print("SPEED: ");
    Serial.print(velocity);
    Serial.println("kmph");
    Serial.print("DIRECTION: ");
    Serial.println(bearing);
  }
     }
  float actualCM1 = 1 * distanceSensor1.measureDistanceCm();
  float actualCM2 = 1 * distanceSensor2.measureDistanceCm();
  Percentage_1 = (MAX_HEIGHT - actualCM1) / (MAX_HEIGHT - 5) * 100  ;
  Percentage_2 = (MAX_HEIGHT - actualCM2) / (MAX_HEIGHT - 5) * 100  ;
    Serial.println(Percentage_1);
  Serial.println(Percentage_2);


send_database();
  
  }
  
}
 
 

void displayInfo()
{
  if (gps.location.isValid() )
  {
    sats = gps.satellites.value();       //get number of satellites
    latitude = (gps.location.lat());     //Storing the Lat. and Lon.
    longitude = (gps.location.lng());
    velocity = gps.speed.kmph();         //get velocity
    bearing = TinyGPSPlus::cardinal(gps.course.value());     // get the direction
    
 
  }
  Serial.println();
}
void send_database(){
    WiFiClient client;
    HTTPClient http;

    // Your Domain name with URL path or IP address with path



// Convert integer variables to string
sendval = String(Percentage_1);
sendval2 = String(Percentage_2);
sendval3 = String(latitude, 6);
sendval4 = String(longitude, 6);

postData = "metal=" + sendval + "&plastic=" + sendval2 + "&lat=" + sendval3 + "&lng=" + sendval4;


http.begin(client,"http://******.***/dbwrite.php");              // Connect to host where MySQL databse is hosted
http.addHeader("Content-Type", "application/x-www-form-urlencoded");            //Specify content-type header



int httpCode = http.POST(postData);   // Send POST request to php file and store server response code in variable named httpCode
Serial.println("Values are, sendval = " + sendval + " and sendval2 = "+sendval2 );


// if connection eatablished then do this
if (httpCode == 200) { Serial.println("Values uploaded successfully."); Serial.println(httpCode);
String webpage = http.getString();    // Get html webpage output and store it in a string
Serial.println(webpage + "\n");
}

// if failed to connect then return and restart

else {
  Serial.println(httpCode);
  Serial.println("Failed to upload values. \n");
  http.end();
  return; }


delay(3000);
digitalWrite(LED_BUILTIN, LOW);
delay(3000);
digitalWrite(LED_BUILTIN, HIGH);

}

void send_cayenne()
{

   Cayenne.loop();
  
  Cayenne.virtualWrite(1, Percentage_1);
  Cayenne.virtualWrite(2, Percentage_2);
}