arduino - RFID-RC522 not reading card -

i have rfid-rc522 (mf-rc522) module , i'm using arduino sketch program. have downloaded example code:

/*  * --------------------------------------------------------------------------------------------------------------------  * example sketch/program showing how read data picc serial.  * --------------------------------------------------------------------------------------------------------------------  * mfrc522 library example; further details , other examples see: https://github.com/miguelbalboa/rfid  *   * example sketch/program showing how read data picc (that is: rfid tag or card) using mfrc522 based rfid  * reader on arduino spi interface.  *   * when arduino , mfrc522 module connected (see pin layout below), load sketch arduino ide  * verify/compile , upload it. see output: use tools, serial monitor of ide (hit ctrl+shft+m). when  * present picc (that is: rfid tag or card) @ reading distance of mfrc522 reader/pcd, serial output  * show id/uid, type , data blocks can read. note: may see "timeout in communication" messages  * when removing picc reading distance early.  *   * if reader supports it, sketch/program read piccs presented (that is: multiple tag reading).  * if stack 2 or more piccs on top of each other , present them reader, first output  * details of first , next picc. note may take time data blocks dumped,  * keep piccs @ reading distance until complete.  *   * @license released public domain.  *   * typical pin layout used:  * -----------------------------------------------------------------------------------------  *             mfrc522      arduino       arduino   arduino    arduino          arduino  *             reader/pcd   uno/101       mega      nano v3    leonardo/micro   pro micro  * signal      pin          pin           pin       pin        pin              pin  * -----------------------------------------------------------------------------------------  * rst/reset   rst          9             5         d9         reset/icsp-5     rst  * spi ss      sda(ss)      10            53        d10        10               10  * spi mosi    mosi         11 / icsp-4   51        d11        icsp-4           16  * spi miso    miso         12 / icsp-1   50        d12        icsp-1           14  * spi sck     sck          13 / icsp-3   52        d13        icsp-3           15  */  #include <spi.h> #include <mfrc522.h>  #define rst_pin         9          // configurable, see typical pin layout above #define ss_pin          10         // configurable, see typical pin layout above  mfrc522 mfrc522(ss_pin, rst_pin);  // create mfrc522 instance  void setup() {     serial.begin(9600);     // initialize serial communications pc     while (!serial);        // nothing if no serial port opened (added arduinos based on atmega32u4)     spi.begin();            // init spi bus     mfrc522.pcd_init();     // init mfrc522     mfrc522.pcd_dumpversiontoserial();  // show details of pcd - mfrc522 card reader details     serial.println(f("scan picc see uid, sak, type, , data blocks...")); }  void loop() {     // new cards     if ( ! mfrc522.picc_isnewcardpresent()) {         return;     }      // select 1 of cards     if ( ! mfrc522.picc_readcardserial()) {         return;     }      // dump debug info card; picc_halta() automatically called     mfrc522.picc_dumptoserial(&(mfrc522.uid)); } 

when execute it, message:

firmware version: 0x0 = (unknown)

warning: communication failure, mfrc522 connected?

scan picc see uid, sak, type, , data blocks...

i have re-checked connections thousand time it's not working, pins connected example says to, , led d1 on (red). can me?

if looking solution...

step-1: change rst pin 5 if using arduino uno or use rst pin 9 in arduino mega. other pins remains same.
step-2:download addicorerfid library.
step-3: open arduino ide , navigate sketch > include library using “add .zip library…” option.
step-4: restart arduino ide (close , open again)
step-5: inside arduino ide navigate file > examples > addicorerfid. select “addicore_rfid_example” sketch , upload sketch
step-6: open serial window , select "both nl & cr" , select "9600" baud rate option

detail explanation can found @ link