RX-30 Finger Print Module Device Interfacing

     Many of  you have must heard about the finger print sensor which actually a nice way to provide security.Here  i have given the interfacing of the R30-X finger print sensor module with  ARM LPC2148 board but the basics remains same for all the micro-controllers.

    The first thing for interfacing the sensor with the controller is the handshaking,in which the controller first sends a signal or hex codes to the sensor and it acknowledges .After handshaking only the controller can talk to the sensor.

unsigned char Message[16] = {0XEF,0X01,0XFF,0XFF,0XFF,0XFF,0X01,0X00,0X07,0X13,0X00,0X00,0X00,0X00,0X00,0X1B};

   This line of commands are the first to be sent to the sensor so as to start the communication.I have given the complete code to communicate with the LPC 2148 below.

Code:

#include 
#include "Serial.h"
#include "Utility.h"
#include "LCD4.h"
#include "Glcd.h"

unsigned char Message[16] = {0XEF,0X01,0XFF,0XFF,0XFF,0XFF,0X01,0X00,0X07,0X13,0X00,0X00,0X00,0X00,0X00,0X1B};
unsigned char ack[12]={0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,0X00,};
unsigned char gim[12]={0XEF,0X01,0XFF,0XFF,0XFF,0XFF,0X01,0X00,0X03,0X01,0X00,0X05};
unsigned char uim[12]={0XEF,0X01,0XFF,0XFF,0XFF,0XFF,0X01,0X00,0X03,0X0A,0X00,0X0E};
int main (void)
{  int i;
 PINSEL0 = 0;
 PINSEL1 = 0;
 PINSEL2 &= 0x0000000C;
 PINSEL2 |= 0x00000030;
 DelayProc(0.2 * CCLOCK);

  LCD4_init(&IOPIN0, 20/*D4*/, 12/*RS*/, 14/*E*/);
 UART1_init(9600/*bps*/, 15000/*kHz*/,length_8_bit, stop_bit_1, parity_disable, parity_odd);
 UART0_init(9600/*bps*/, 15000/*kHz*/, length_8_bit, stop_bit_1, parity_disable, parity_odd);

 
 for(i=0;i<16;i++)
 {
 UART1_sendchar(Message[i]);
 
 }
    for(i=0;i<12;i++)
 {
    ack[i]=UART1_getchar();
 }
  if(ack[9]==0x00)
{
UART0_sendstring("password checked sucessfully\n\n");
LCD4_sendstr (0,2, "password checked sucessfully");
} 
  label:
    for(i=0;i<12;i++)
 {
 UART1_sendchar(gim[i]);
 
 }
 for(i=0;i<12;i++)
 {
    ack[i]=UART1_getchar();
 } 

  if(ack[9]==0x02)
{
UART0_sendstring("cant find finger\n\n");
LCD4_sendstr (0,1, "cant find finger");
DelayProc(.7 * CCLOCK);
LCD4_sendstr (0,1, "Put finger");
UART0_sendstring("Put finger\n\n");
DelayProc(.7* CCLOCK);
goto label;

}
if(ack[9]==0x00)
{
UART0_sendstring("finger scan sucessfully completed\n\n");
LCD4_sendstr (0,1, "finger scan sucessfully completed");
}

 for(i=0;i<12;i++)
 {
 UART1_sendchar(uim[i]);
 
 }
 for(i=0;i<40000;i++)
 {
    UART0_sendchar(UART1_getchar());
 } 


      LCD4_sendstr (0,1, "image downloaded");

}