RFID-RC522 with Arduino Pro Micro project. Error on the code?

hi all,

first of newbie...
i trying make below project, keep having type of errors.

let start project page: unlock pc/mac rfid

my hardware:
arduino micro

rfid-rc522


code:

code: [select]

//get library https://github.com/ljos/mfrc522
//sketch: gudjonholm@gmail.com

/*
pins    spi        uno    mega2560  leonardo
1 (nss) sda (ss)   10     53        10
2       sck        13     52        sck1
3       mosi       11     51        mosi1
4       miso       12     50        miso1
5       irq        *      *         *
6       gnd        gnd     gnd       gnd
7       rst        9      ?         reset
8      +3.3v (vcc) 3v3     3v3       3.3v
*/
#include <mfrc522.h>
#include <spi.h>
#include "keyboard.h"

#define sad 10
#define rst 9

#define ledpinopen    4
#define ledpinclosed  3

mfrc522 nfc(sad, rst);

boolean opening = false;

void setup() {
  //keyboard.begin();
  pinmode(ledpinopen  , output);  
  pinmode(ledpinclosed, output);  
  spi.begin();
  nfc.begin();
  byte version = nfc.getfirmwareversion();
}

#define authorized_count 2 /*if want more authorized of cards set count here, , add serials below*/

byte authorized[authorized_count][4] = {
  {0x86, 0x7b, 0xd2, 0x48, }
  ,{0xa5, 0xa0, 0x83, 0x2c, }  //example how add more authorized cards
  };
                          
boolean issame(byte *key, byte *serial);
boolean isauthorized(byte *serial);

void loop() {
  byte status;
  byte data[max_len];
  byte serial[5];
  
  digitalwrite(ledpinopen, opening);
  digitalwrite(ledpinclosed, !opening);
  
  status = nfc.requesttag(mf1_reqidl, data);

  if (status == mi_ok) {
    status = nfc.anticollision(data);
    memcpy(serial, data, 5);
    
    if(isauthorized(serial))
    {
      opening = !opening; // interruttore on-off
      delay(200);
      keyboard.print(password here);
      delay(500);
      keyboard.press(key_return);
      delay(200);
      keyboard.releaseall();
    }
    else
    {
      opening = false;
    }
    
    nfc.halttag();
    digitalwrite(ledpinopen, opening);
    digitalwrite(ledpinclosed, !opening);
    delay(2000);
  }
  delay(500);
}


boolean issame(byte *key, byte *serial)
{
    for (int = 0; < 4; i++)
    {
      if (key[i] != serial[i])
      {
        return false;
      }
    }
    return true;
}

boolean isauthorized(byte *serial)
{
    for(int = 0; < authorized_count; i++)
    {
      if(issame(serial, authorized[i]))
      return true;
    }
    return false;
}




my hardware connections:

https://ibb.co/ngt4or

https://ibb.co/n2qjor

https://ibb.co/nrt2sm


library project installed on arduino ide 1.8.5

library mfrc522

errors when compiling:

code: [select]

'class mfrc522' has no member named 'begin'


code: [select]

´keyboard`

can help? getting desperate @ point...

thanks

the instructions use leonardo or pro micro, yet using nano.  luck!

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if project involves wiring, please provide schematic and/or wiring diagram and/or clear photograph of wiring.

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