RFreader reads the input fron the ID-card and sends it to microcontroller. mcu compares the same no with the available no's. If no. is matched then generates output pin high. Plz help in me in implementing the code in c.Total there are 250 different IDs available.
=> give me some topics that I need to study related to this project...
www.exforsys.com/.../c-arrays.html www.exforsys.com/.../handling-of-character-strings-in-c.html
and
'1' is not equal to 1
"1" is not equal to '1'
11 is not equal to 0x11
case 9481300500: open_door(); break; case 9980428098: open_door(); break;
and you also need to well define the data type of 9481300500, 9980428098.
www.exforsys.com/.../c-programming-language-data-types.html www.exforsys.com/.../c-programming-data-types-part-2.html
#include<reg51.h> void boud_rate() { SCON = 0x50; TMOD = 0x20; /* timer 1, mode 2, 8-bit reload */ TH1 = 0xFD; /* reload value for 2400 baud */ TR1 = 1; TI = 1; } char serial_receive() { char chr; /* variable to hold the new character */ while (RI != 1) {;} chr = SBUF; RI = 0; return(chr); } void main(void) { boud_rate(); unsigned char rx_data; for(;;) { rx_data = serial_receive(); switch(rx_data) { // case '1': open_door(); case 0067892341 : open_door(); break; // case '9': open_door(); case 0045780034 : open_door(); break; default: dont_open(); } proper_delay(); } }
errors
'rx_data':undefined identifier illigal octal digit
please tell me how to overcum these errors