How to interface fingerprint module serially with AVR

[usman]

Hi

 I want to send a data package of 14 bytes serially from my atmega16L to finger print module R303A to perform commands.

please help me if anyone has used any fingerprint module 

[Bhaaskar]

Put on array and send the data in array serially

 

[Amit Joshi]

 first find out the baud rate of the finger print module and set the USART baud rate accordingly.
store the whole 14 byte data into array and transmit it using USART. try the following link to learn usart

http://www.engineersgarage.com/embedded/avr-microcontroller-projects/usart-serial-transmission-circuit

[usman]

 

Hi, this is what I m doing but unsuccessful…  

 

#define USART_BAUDRATE 57600

#define F_CPU 8000000

#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16))) – 1)

 

 

//this is the packet i want to transmit. I have define the array as:

char GenImg[12] = { 0xEF, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x00, 0x03, 0x01, 0x00, 0x05 };

 

 

//I have called in the main these functions:

usart_init();

_delay_ms(500);

_delay_ms(500);

send_bytes(GenImg,12);

 

 

//this function is for “initialization of usart”:

void usart_init()

{

 

UCSRB |= (1 << RXEN) | (1 << TXEN);   // Turn on the transmission and reception circuitry

UCSRC |= (1 << URSEL) | (1 << UCSZ0) | (1 << UCSZ1); 

// Use 8-bit character sizes

UCSRC &= ~(1 << UMSEL); // In UCSRC, UMSEL = 0 for asynchronous

UCSRC &= ~(1<<USBS); //In UCSRC, USBS = 0 => 1 stop bit

 

UBRRL = BAUD_PRESCALE; 

// Load lower 8-bits of the baud rate value into the low byte of the UBRR register

UBRRH = (BAUD_PRESCALE >> ; // Load upper 8-bits of the baud rate value..

// into the high byte of the UBRR register

}

 

 

//this is function for transmitting:

void send_bytes(char *s, int length)

{

while (length–)

{

usart_transmit(*s);

s++;

}

}

 

 

void usart_transmit(unsigned char c)

{

while(!(UCSRA & (1 << UDRE))); // wait until UDR ready

UDR = c; // send character

}

 

 

Please help me to correct any errors!

[dagakshay]

what are the error you getting when you debug it…

[dimas fahmigafur]

how ready to work with AVR project with ingerprint????

may i give an example please bro??

[sathya]

Hi Can you please send the embedded c code (not vb) for finger print module r303a to my mail id : [email protected]

Awaiting for your reply

[divya]

In R303A module checksum = package id + package legnth + package content…..but the check sum size is two bytes do we need to neglect low byte overflow or high byte overflow..

 

Thanks in advance..

 

 

[Sumit dubey]

hey even m facing the same problem…….
i hv some basic difficulties lyk…..how cn set the baud rate of finger print module…..
what command sould i send to initialize finger print module…..
 

i even tried to interface it direct to pc using RS232 cable with its defaul baud rate but it is not responding…!!!
is there any command tht will confirm tht my finger print module is working fine….??

 

it would be great if  i get some help related to this issue…..reply me plzzz

[Abhishek jain]

hi everyone, 

 

can anyone please help me in sending commands to fingerprint module (r303) from at89c51 in c coding. if anyone can find then please reply or send me to my mail id i.e. [email protected]  

[pradeep v]

Hi..

can anyone send me the complete c-code for finger print module (R303A)? plz send it to [email protected]

[Rajdeep singh]

Hello, I am also facing same problem, but when i am connecting fingerprint module with hyper terminal using MAX232 data receiving properly but when i am connecting fingerprint module with microcontroller, no data is receiving at the outupt,anybody help…

[AJISH ALFRED]

Hi Rajdeep,

Make sure that you are using MAX232 converter for connecting the module with the microcontroller and also check it properly for working. You can do loop back test with the MAX232 to ensure that it is working.

[Disha raka]

Dear all,

 

here i m using R305 Finger print module with P89V51RD2

but my program is not working please see my program n say me corrections,

or give me your code please…

its urgent friends…

 

 

program:

 

 

#include<reg51.h>

#include<string.h>

 

sfr ldata=0x90;

sbit rs=P2^3;

sbit rw=P2^4;

sbit en=P2^5;

sbit busy=P1^7;

sbit S1=P3^2;

sbit S2=P3^3;

sbit S3=P3^4;

//===================================================================/

void fingerprint(void);

void UARTSendByte(unsigned char[],unsigned char dt );

unsigned char UARTGetByte(void);

void fingerdata(char);

void conv();

void elect();

void lcdcmd(unsigned char);

void lcddata(unsigned char);

void lcdready();

void msdelay(unsigned int);

void UARTInit(void);

 

//==============================================================================/

unsigned int i,j,g,h,k,l,key,m,n;

 

code unsigned char mydata1[]“WELCOME”);    //7

code unsigned char mydata2[]“SCAN UR FINGER 1st”);  //  18

code unsigned char mydata3[]“SCANNING”);   //9

code unsigned char mydata4[]“ACCESS GRANTED”); //14

code unsigned char mydata5[]“ACCESS DENIED”); //13

 

code unsigned char mydata8[]“THANKS”);   //6

 

code unsigned char mydata12[]“>”);

code unsigned char mydata11[]“<<“);

unsigned char dec1,dec2,asc1,asc2,adc1;

 

 

 

 

//===============================================================================/

 

 

code char GenImg[12] = { 0xEF, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0x01, 0x00, 0x03, 0x01, 0x00, 0x05 };

 

//==================================================================================/

void conv()

{

  dec1=adc1%10;

 

dec2=adc1/10;

 

asc1=dec1 | 0x30;

 

asc2=dec2 | 0x30;

}

 

 

//=========================================================================================/

void main()

{

 

lcdcmd (0x38);   //8 bit LCD mode

lcdcmd(0x0C);  //

lcdcmd(0x01);  // clear lcd

lcdcmd(0x06);  //   lcd on pointer off

 

  

do   //LOOP START 

{

lcdcmd(0x01);  // clear lcd

lcdcmd(0x86);  //1st line 

for(i=0;i<strlen(mydata1);i++) //WELCOME

lcddata(mydata1);

 

 

 

for(i=0;i<strlen(mydata2);i++)   //  SCAN UR FINGER 1st

lcddata(mydata2);

 

 

msdelay(500); //

 

lcdcmd(0x01);   //clr lcd

lcdcmd(0x86);  //1st line

for(i=0;i<strlen(mydata3);i++)  //SCANNING

     lcddata(mydata3);

 

 

lcdcmd(0x06);

for(k=0x94;k<0xA8;k++)

  {

lcdcmd(k); //>>>>>>>>>>>>>>>>>>>>>>>>>

  for(i=0;i<strlen(mydata12);i++)

lcddata(mydata12);

       }  

 

  UARTInit();

UARTSendByte(GenImg,12);

  UARTGetByte();

fingerdata(i); 

 

 

 

msdelay(500);

 

lcdcmd(0x01);

lcdcmd(0x9b);   //3rd line 

for(i=0;i<strlen(mydata8);i++) //THANKS

lcddata(mydata8);

 

msdelay(10);

lcdcmd(0xc5);

 

 

  

}

 

 

}while(1);   //repeat forever

 

 

 

}  //main end 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

void UARTSendByte(unsigned char GenImg[],unsigned char dt)

{

 

for(i=0;i<dt;i++)

  {

TI=0;

   SBUF = GenImg;

    while(TI==0);

        TI=0;

 

 

   }

}

 

//

unsigned char UARTGetByte(void)

{   RI=0;

        while(RI==0);

        RI=0;

        return SBUF;

}

 

 

void fingerdata(char i)

{

 i=SBUF;

 adc1=i;

conv();

lcddata(asc2);

lcddata(asc1);

 

}

 

 

 

//======================================================================/

void lcdcmd (unsigned char value)

{

lcdready();

ldata=value;

rs=0;

rw=0;

en=1;

msdelay(1);

en=0;

return;

}

//====================================================================================================/

void lcddata (unsigned char value)

{

lcdready();

ldata=value;

rs=1;

rw=0;

en=1;

msdelay(1);

en=0;

return;

}

//====================================================================================================/

void lcdready()

{

busy=1;

rs=0;

rw=1;

while (busy==1)

{

en=0;

msdelay(1);

en=1;

}

return;

}

//==========================================================================================================/

void msdelay(unsigned int value)

{

unsigned int i,j;

for(i=0;i<value;i++)

for(j=0;j<1275;j++) ;

}

 

//====================================================================================/

void UARTInit(void)

{

PCON=0X80;

        SCON=0X50;    //232  COM init 

        TMOD=0x20;

        TH1=0XFE;

        TR1=1;

        

}

  

[Disha raka]

hi all

anyone please reply yaar… 

[Author]

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