Rfid Based Attendance System

RFID Based Attendance System

#include<reg51.h> #include<string.h> //0000 to 7FFF sbit RS = P0^7; sbit EN = P0^6; sbit SDA = P1^0; sbit SCL = P1^1; sbit RELAY = P1^2; code unsigned char RFID_1[] = "34006C9C04C0"; //34006C9C04+NULL code unsigned char RFID_2[] = "34006C549C90"; code unsigned char RFID_3[] = "1300F8FAC1D0"; code unsigned char RFID_4[] = "34006CD5AD20"; code unsigned char RFID_5[] = "420061231E1E"; code unsigned char name_1[] = "SANJAY JAIN"; code unsigned char name_2[] = "SHEKHAT HARSH"; code unsigned char name_3[] = "DHOLARIYA RAKSHIT"; code unsigned char name_4[] = "DIVYANG SINGH "; code unsigned char name_5[] = "NAKUL JAIN"; unsigned char rs[15]; unsigned int no_of_records; void delay() { int j; for(j=0;j<500;j++); } void long_delay() { unsigned int j; for(j=0;j<65000;j++); } void idelay() { unsigned int j; for(j=0;j<10000;j++); } void lcd_command(char lc) { P2 = lc; RS = 0; EN = 1; delay(); EN = 0; } void lcd_data(char ld) { P2 = ld; RS = 1; EN = 1; delay(); EN = 0; } void lcd_init() { lcd_command(0x38); lcd_command(0x0E); lcd_command(0x01); } void serial_init() { TMOD = 0x20; SCON = 0x50; TH1 = 0xFD; TR1 = 1; } void transmit(unsigned char tx) { SBUF = tx; while(TI==0); TI = 0; } void send_string(unsigned char *str) { int j; for(j=0;str[j]!='\0';j++) transmit(str[j]); } unsigned char receive() { char rx; while(RI==0); RI = 0; rx = SBUF; return(rx); } void lcd_string(char add,char *str) { int j; lcd_command(add); for(j=0;str[j]!='\0';j++) lcd_data(str[j]); } void start() { SDA = 1; SCL = 1; SDA = 0; } void stop() { SDA = 0; SCL = 1; SDA = 1; } void write(unsigned char w) { int j; SCL = 0; for(j=0;j<8;j++) { if((w & 0x80)==0) SDA = 0; else SDA = 1; SCL = 1; SCL = 0; ww = w << 1; } SCL = 1; SCL = 0; } unsigned char read() { int j; unsigned char r = 0x00; SDA = 1; for(j=0;j<8;j++) { SCL = 1; rr = r << 1; if(SDA == 1) rr = r | 0x01; SCL = 0; } return(r); } void ack() { SDA = 0; SCL = 1; SCL = 0; } void nack() { SDA = 1; SCL = 1; SCL = 0; } void rtc_read() { unsigned char ss,mm,hh,day,mn,date,yr; start(); write(0xD0); write(0x00); stop(); start(); write(0xD1); ss = read(); ack(); mm = read(); ack(); hh = read(); ack(); day = read(); ack(); date = read(); ack(); mn = read(); ack(); yr = read(); nack(); stop(); rs[0] = hh/0x10 + 48; rs[1] = hh%0x10 + 48; rs[2] = ':'; rs[3] = mm/0x10 + 48; rs[4] = mm%0x10 + 48; rs[5] = ','; rs[6] = date/0x10 + 48; rs[7] = date%0x10 + 48; rs[8] = '/'; rs[9] = mn/0x10 + 48; rs[10] = mn%0x10 + 48; rs[11] = '/'; rs[12] = yr/0x10 + 48; rs[13] = yr%0x10 + 48; rs[14] = '\0'; } void rtc_init() { start(); write(0xD0); write(0x00); write(0x00); write(0x00); write(0x13); write(0x05); write(0x12); write(0x04); write(0x12); stop(); } void write_records(unsigned char *str); void read_records(); void main() { unsigned char rec_data[13],i,t; RELAY = 0; lcd_init(); serial_init(); rtc_init(); idelay(); start(); write(0xA0); write(0x7F); write(0xFF); stop(); start(); write(0xA1); no_of_records = read(); nack(); stop(); // no_of_records = 0; while(1) { start: lcd_command(0x01); lcd_string(0x80,"RFID ATTENDANCE"); lcd_string(0xC5,"SYSTEM"); j = 0; while(1) { if(RI==1) { RI = 0; t = receive(); if(t == '+') { read_records(); goto start; } else { rec_data[j] = t; for(j=1;j<12;j++) rec_data[j] = receive(); rec_data[j] = '\0'; break; } } } j = strcmp(RFID_1,rec_data); //match => j = 0 lcd_command(0x01); if(j==0) { RELAY = 1; lcd_string(0x80,name_1); rtc_read(); lcd_string(0xC0,rs); long_delay(); write_records(name_1); RELAY = 0; goto start; } // j = strcmp(RFID_2,rec_data); //match => j = 0 if(j==0) { RELAY = 1; lcd_string(0x80,name_2); rtc_read(); lcd_string(0xC0,rs); long_delay(); write_records(name_2); RELAY = 0; goto start; } // j = strcmp(RFID_3,rec_data); //match => j = 0 if(j==0) { RELAY = 1; lcd_string(0x80,name_3); rtc_read(); lcd_string(0xC0,rs); long_delay(); write_records(name_3); RELAY = 0; goto start; } j = strcmp(RFID_4,rec_data); //match => j = 0 if(j==0) { RELAY = 1; lcd_string(0x80,name_4); rtc_read(); lcd_string(0xC0,rs); long_delay(); write_records(name_4); RELAY = 0; goto start; } j = strcmp(RFID_5,rec_data); //match => j = 0 if(j==0) { RELAY = 1; lcd_string(0x80,name_5); no_of_records = 0; start(); write(0xA0); write(0x7F); write(0xFF); write(0x00); stop(); lcd_string(0xC0,"MEMORY CLEARED"); long_delay(); RELAY = 0; goto start; } lcd_string(0x80,"ERROR"); lcd_string(0xC0,rec_data); long_delay(); } }