RFID attendance system review in tamil

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this video is my 100th video in youtube

to get my app click here

before uploading change the uid code of the your RFID tag...
then upload that code

coding for that video 

/*
PINOUT:
RC522 MODULE    Uno/Nano     MEGA
SDA             D10          D9
SCK             D13          D52
MOSI            D11          D51
MISO            D12          D50
IRQ             N/A          N/A
GND             GND          GND
RST             D9           D8
3.3V            3.3V         3.3V
*/
/* Include the standard Arduino SPI library */
#include <SPI.h>
/* Include the RFID library */
#include <MFRC522.h>
#include <LiquidCrystal.h>

LiquidCrystal lcd(2,3,4,5,6,7);//rs,e,d0,d1,d2,d3
String rfid = "";
bool id1 = false;
bool id2 = false;
int successRead;
/* Define the DIO used for the SDA (SS) and RST (reset) pins. */
#define SDA_DIO 10
#define RESET_DIO 9
/* Create an instance of the RFID library */
MFRC522 mfrc522(SDA_DIO, RESET_DIO); 

void setup()
{ 
  Serial.begin(9600);
  /* Enable the SPI interface */
  SPI.begin(); 
  lcd.begin(16,2);
  mfrc522.PCD_Init();
  Serial.println("RFID CARD SETUP");
}

void loop()
{
  do{
    successRead = getID();
  }
  while (!successRead);
  if (rfid == "9D 22 B5 2D")//for card
  {
    id1 = !id1;
    if(id1 == true)
    {
      Serial.println("STUDENT 1,1");
      lcd.print("STUDENT 1");
      lcd.setCursor(0,1);
      lcd.print("welcome");
    }
    else if(id1 == false)
    {
      Serial.println("STUDENT 1,0");
      lcd.print("STUDENT 1");
      lcd.setCursor(0,1);
      lcd.print("thank you");
    }
    
  }
  if (rfid == "7D 18 24 D9")// for keychain
  {
    id2 = !id2;
   if(id2 == true)
    {
      Serial.println("STUDENT 2,1");
      lcd.print("STUDENT 2");
      lcd.setCursor(0,1);
      lcd.print("welcome");
    }
    else if(id2 == false)
    {
      Serial.println("STUDENT 2,0");
      lcd.print("STUDENT 2");
      lcd.setCursor(0,1);
      lcd.print("thank you");
    } 
  }  
  rfid = "";
  delay(3000);
  lcd.clear();
  
}


int getID() {
  
  if ( ! mfrc522.PICC_IsNewCardPresent()) { 
    return 0;
  }
  if ( ! mfrc522.PICC_ReadCardSerial()) {
    return 0;
  }
  

  for (int i = 0; i < mfrc522.uid.size; i++) 
  {
    rfid += mfrc522.uid.uidByte[i] < 0x10 ? " 0" : " ";
    rfid += String(mfrc522.uid.uidByte[i], HEX); 
  }
  rfid.trim();
  rfid.toUpperCase();
  
  mfrc522.PICC_HaltA();
  return 1;
}
**********--------------*****************-------------------******************
before uploading change the uid code of the your RFID tag...
then upload that code

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