[Hemraj]

Which fingerprint scanner  are you using. First study its mannual. Its very easy.

[Hemraj]

Good . Congrats… You are on right track…

[Hemraj]

Your problem solved or not.

[Hemraj]

Firstly study the Fingerprint scanner mannual. Try to figer out how it will communicate with PIC16FxxxA or PIC18Fxxx.

[Hemraj]

Use TRIS registor for direction. Not PORTD.

 

[Hemraj]

Firstly isolate both circuits i mean analog and Microconreoller and check the output of 741 . is it going high and low on the basis of your sensor. if not then check your circuit. or if yes then

Which pic microcontroller you are using. Are you using anlog pins for input. if yes then make them D/I .

Put pull up resistance on that pin.

 

Hemraj

[Hemraj]

If you  provide some link or picture then i can help you. But it will be nice if you try it yourself and then if some problem come then share it on forum so some one help you. Try to represent your problem in graphical manner.

 

[Hemraj]

pratiik, Most probababaly you have done some hardware mistake. Bcoz i checked code and used code from here. You can refer datasheet of graphical LCD and Connect variable resistance at VEE pin.

 

[Hemraj]

Aneesh, can you tell in which format you are getting signals from sensor. I mean it is in voltage or PWM or Serial data. Then i can help you.

 

[Hemraj]

If your code is not working then you can do one modification in function:

 

void gsm_cmd(char *cmd)
{
usart_send_string(cmd);

usart_send(0x0A);
usart_send(0x0D);
_delay_ms(500);
}

[Author]

Posts