Nivedita Mukka / Mbed 2 deprecated Personal Alert System using RFID with FRDM K64F Featured

This is a cost effective alert system that uses radio frequency identification. RC522 module and 13.56MHz RFID tags are used. Differentiates between registered and unregistered users based on UID of the tag, then displays alerts in serial terminal. The code presently has two registered users; can be easily expanded to have more registered users.

Dependencies:   MFRC522 mbed

main.cpp

Committer:
nivmukka
Date:
2016-03-27
Revision:
1:d950cea9271b
Parent:
0:1026a98e87f4

File content as of revision 1:d950cea9271b:

#include "mbed.h"
#include "MFRC522.h"

// FRDM-K64F (Freescale) Pin for MFRC522 reset
#define MF_RESET    PTD0

// Defining the serial ports for PC and Bluetooth
#define SERIAL_1  
Serial pc(USBTX, USBRX);
#ifdef SERIAL_1
Serial blue(PTC15,PTC14);         
#endif
#ifdef SERIAL_2
Serial blue(PTC17,PTC16);         // TX = P14  RX = P13
#endif

DigitalOut LedGreen(LED2), LedRed(LED1);

Timer timeBetweenCards;
char tagname;
char * cardtypetest;
char cardid;

//MFRC522    RfChip   (SPI_MOSI, SPI_MISO, SPI_SCK, SPI_CS, MF_RESET);
MFRC522    RfChip   (PTD2, PTD3, PTD1, PTE25, PTD0);

int main(void) {
  
  blue.baud(9600);
  pc.baud(9600);
  LedRed= 0;
  pc.printf("RFID based Alert System Started\r\n");
  printf("-------------------------------------------------------------\r\n");

  // Init. RC522 Chip
  RfChip.PCD_Init();

  while (true) {

    tagname = '\0';
    LedRed= 1;
    LedGreen = 1;

    // Look for new cards
    if ( ! RfChip.PICC_IsNewCardPresent())
    {
      wait_ms(100);
      continue;
    }

    // Select one of the cards
    if ( ! RfChip.PICC_ReadCardSerial())
    {
      wait_ms(100);
      
      continue;
      
    }
    
    // When a card is detected, a Green Led flashes!
    blue.printf("%f seconds \n", timeBetweenCards.read());
    timeBetweenCards.start();
    LedGreen = 0; 
    
    for (uint8_t i = 0; i < RfChip.uid.size; i++)
    {
  //    printf(" %X02", RfChip.uid.uidByte[i]);
        cardid= RfChip.uid.uidByte[i];
        blue.printf(" %X02 ", (char *) cardid);
        tagname= RfChip.uid.uidByte[i]+ tagname;
        blue.putc(tagname);
     }
    printf("\n\r");
    if (tagname == 206) {
        
        printf ("Blue Keychain detected: Welcome, Nivedita!");
        printf("\n\r");
        printf("------------------------------------------------");
        
        }
    else if (tagname == 124) {
        printf ("White Card detected: Welcome, Apoorva!");
        printf("\n\r");
        printf("------------------------------------------------");        
        }
    else if (tagname == 76) {
        printf ("Unknown person (White card): sending alert!! ");
        printf("\n\r");
        printf("------------------------------------------------");        
        }
      else if (tagname == 58) {
        printf ("Unknown person (Blue keychain): sending alert!! ");
        printf("\n\r");
        printf("------------------------------------------------");        
        }
        else {
        printf("--------------------!!!!!!!!!---------------------\n\r");    
        printf("Unknown card/keychain detected; sending alert!!!");
        printf("\n\r");
        printf("------------------------------------------------");        
        }
               
    // Print Card UID
    printf("\n\r");
    printf("Card UID: ");
    
   for (uint8_t i = 0; i < RfChip.uid.size; i++)
    {
        printf(" %X02", RfChip.uid.uidByte[i]);
        cardid= RfChip.uid.uidByte[i];
        blue.printf(" %X02 ", (char *) cardid);
        tagname= RfChip.uid.uidByte[i]+ tagname;
        blue.putc(tagname);
    }
    printf("\n\r");
              
    printf("Decimal tagname:  %d \n\r", tagname);   
    uint8_t piccType = RfChip.PICC_GetType(RfChip.uid.sak);
    printf("PICC Type: %s \n\r", RfChip.PICC_GetTypeName(piccType));
    cardtypetest= RfChip.PICC_GetTypeName(piccType);
    blue.printf("PICC Type: %s \n\r",(char *) cardtypetest);
    printf("________________________________________________");
    //wait_ms(100);
  }
}