#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal.h>
#include <SoftwareSerial.h>
SoftwareSerial SIM900(7, 8);
String textForSMS;

#define SS_PIN 10
#define RST_PIN 9
MFRC522 mfrc522(SS_PIN, RST_PIN);        

// lcd pins
#define rs A1 
#define en A2 
#define d4 6 
#define d5 5  
#define d6 4 
#define d7 3 

LiquidCrystal lcd(rs, en, d4, d5, d6, d7);

 

String f1001 = "+8801624856713"; 
String f1002 = "+8801923707010";  

void setup() {
        Serial.begin(9600);        
        randomSeed(analogRead(0));
        SIM900.begin(9600); 
        SPI.begin();                
        mfrc522.PCD_Init();        
        
        
          
  lcd.begin(16, 2);
  
  lcd.print("AttendanceSystem");
  delay(3000); 
  lcd.clear(); 
  lcd.print(" Swip Your Card"); 
  delay(1000); 
  
  
}

void loop() {
        
  
        
        MFRC522::MIFARE_Key key;
        for (byte i = 0; i < 6; i++) {
                key.keyByte[i] = 0xFF;
        }
        
        if ( ! mfrc522.PICC_IsNewCardPresent()) {
                return;
        }

        
        if ( ! mfrc522.PICC_ReadCardSerial()) {
                return;
        }
        
        
        
        Serial.print("Card UID:");
        for (byte i = 0; i < mfrc522.uid.size; i++) {
             
        } 
        Serial.println();

        
        byte piccType = mfrc522.PICC_GetType(mfrc522.uid.sak);
    

        if (        piccType != MFRC522::PICC_TYPE_MIFARE_MINI 
                &&        piccType != MFRC522::PICC_TYPE_MIFARE_1K
                &&        piccType != MFRC522::PICC_TYPE_MIFARE_4K) {
                
                return;
        }
        
 
                // student1
        if( (mfrc522.uid.uidByte[0] == 0x7B) && (mfrc522.uid.uidByte[1] == 0x1B) && (mfrc522.uid.uidByte[2] == 0xBB) && (mfrc522.uid.uidByte[3] == 0x1C) ) 
        {
          lcd.clear();
          lcd.print("AttendanceMarked");
          delay(500); 
Serial.println("student 1");
        
            
          sendsms(" Saif is Present", f1001);
          delay(1000);   
        
         lcd.setCursor(0, 1);
         lcd.print("  message sent"); 
         delay(2000); 
         
         lcd.clear(); 
          lcd.print(" Swip Your Card");
          delay(1000); 
        }
        
                        // student2
        if( (mfrc522.uid.uidByte[0] == 0xD3) && (mfrc522.uid.uidByte[1] == 0xC2) && (mfrc522.uid.uidByte[2] == 0x18) && (mfrc522.uid.uidByte[3] == 0x1C) )
        {
         lcd.clear();
          lcd.print("AttendanceMarked");
          delay(500); 
  Serial.println("student 2");
         
          sendsms("Kawsar is Present", f1002);
          delay(1000);   
        
         lcd.setCursor(0, 1);
         lcd.print("  message sent"); 
         delay(2000); 
         
         lcd.clear(); 
          lcd.print(" Swip Your Card");
          delay(1000); 
        }
       
       else 
        Serial.println("unregistered user");

     }


void sendsms(String message, String number)
{
String mnumber = "AT + CMGS = \""+number+"\""; 
   SIM900.print("AT+CMGF=1\r");                   
  delay(1000);
 SIM900.println(mnumber);  
 
  delay(1000);
  SIM900.println(message);                         
  delay(1000);
  SIM900.println((char)26);                        
  delay(1000); 
  SIM900.println();
  delay(100);                                     
}