R30X Finger Print Module Device Interfacing

Bikash Narayan Panda

Many of you must have heard about the fingerprint sensor which a nice way to provide security. Here i have given the interfacing of the R30X fingerprint sensor module with  ARM LPC2148 board but the basics remain the 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 is the first to be sent to the sensor to start the communication. I have given the complete code to communicate with the LPC2148 below.

#include "Serial.h"
#include "Utility.h"
#include "LCD4.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 sucessfullynn");
    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 fingernn");
    LCD4_sendstr(0, 1, "cant find finger");
    DelayProc(.7 * CCLOCK);
    LCD4_sendstr(0, 1, "Put finger");
    UART0_sendstring("Put fingernn");
    DelayProc(.7 * CCLOCK);
    goto label;

  }
  if (ack[9] == 0x00) {
    UART0_sendstring("finger scan sucessfully completednn");
    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");

}
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