RFID not reading any card - rfid

Question

My RFID wont read any card. The Rfid card is on with red led at D1. I do not know what is the problem though. Below is my code. Please assist
The picture is connection between the rfid and esp8266
//*******************************libraries********************************
//RFID-----------------------------
#include <SPI.h>
#include <MFRC522.h>
//NodeMCU--------------------------
#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
//************************************************************************
#define SS_PIN D2 //D2
#define RST_PIN D1 //D1
//************************************************************************
MFRC522 mfrc522(SS_PIN, RST_PIN); // Create MFRC522 instance.
//************************************************************************
/* Set these to your desired credentials. */
const char *ssid = "***";
const char *password = "***";
const char* device_token = " 4876407e7cbc0c2b";
//************************************************************************
String URL = "http://192.168.0.110/rfidattendance/getdata.php"; //computer IP or the server domain
String getData, Link;
String OldCardID = "";
unsigned long previousMillis = 0;
//************************************************************************
void setup() {
delay(1000);
Serial.begin(115200);
SPI.begin(); // Init SPI bus
mfrc522.PCD_Init(); // Init MFRC522 card
//---------------------------------------------
connectToWiFi();
}
//************************************************************************
void loop() {
//check if there's a connection to Wi-Fi or not
if(!WiFi.isConnected()){
connectToWiFi(); //Retry to connect to Wi-Fi
}
//---------------------------------------------
if (millis() - previousMillis >= 15000) {
previousMillis = millis();
OldCardID="";
}
delay(50);
//---------------------------------------------
//look for new card
if ( ! mfrc522.PICC_IsNewCardPresent()) {
return;//got to start of loop if there is no card present
}
// Select one of the cards
if ( ! mfrc522.PICC_ReadCardSerial()) {
return;//if read card serial(0) returns 1, the uid struct contians the ID of the read card.
}
String CardID ="";
for (byte i = 0; i < mfrc522.uid.size; i++) {
CardID += mfrc522.uid.uidByte[i];
}
//---------------------------------------------
if( CardID == OldCardID ){
return;
}
else{
OldCardID = CardID;
}
//---------------------------------------------
// Serial.println(CardID);
SendCardID(CardID);
delay(1000);
}
//************send the Card UID to the website*************
void SendCardID( String Card_uid ){
Serial.println("Sending the Card ID");
if(WiFi.isConnected()){
HTTPClient http; //Declare object of class HTTPClient
//GET Data
getData = "?card_uid=" + String(Card_uid) + "&device_token=" + String(device_token); // Add the Card ID to the GET array in order to send it
//GET methode
Link = URL + getData;
// http.begin(Link); //initiate HTTP request //Specify content-type header
int httpCode = http.GET(); //Send the request
String payload = http.getString(); //Get the response payload
// Serial.println(Link); //Print HTTP return code
Serial.println(httpCode); //Print HTTP return code
Serial.println(Card_uid); //Print Card ID
Serial.println(payload); //Print request response payload
if (httpCode == 200) {
if (payload.substring(0, 5) == "login") {
String user_name = payload.substring(5);
// Serial.println(user_name);
}
else if (payload.substring(0, 6) == "logout") {
String user_name = payload.substring(6);
// Serial.println(user_name);
}
else if (payload == "succesful") {
}
else if (payload == "available") {
}
delay(100);
http.end(); //Close connection
}
}
}
//********************connect to the WiFi******************
void connectToWiFi(){
WiFi.mode(WIFI_OFF); //Prevents reconnection issue (taking too long to connect)
delay(1000);
WiFi.mode(WIFI_STA);
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("Connected");
Serial.print("IP address: ");
Serial.println(WiFi.localIP()); //IP address assigned to your ESP
delay(1000);
}
//=======================================================================
When I execute it, the rfid scanner is turn on but it does not read any card. I am using MFRC522, The wifi is connected successfully. I already pin the connection correctly