Finger print did not match in R307 finger print sensor

Other Hardware Sensors
1
  • I am using Uno, finger print module & Adafruit library.
  • With using all the library all the function works ok, like delete, scan but i have some issues in Enroll function.
  • Enroll function is below, it is same, except some minor changes & I had a small key_read function, in case user wants to exit. key_read is small non-blocking function, read a variable only, which get set/reset in ISR only, so minimal code there.
  • Problem is :
    a) When first scan is done, it is OK.
    b) next it ask for remove finger & place again.
    c) now doing that & place finger again, code many times gives finger mismatch.
    d) 9 out of 10 times it is giving mismatch . Although I am doing the same way every-time.
  • Same happens if I use En-roll example from Adafruit also.
  • What could be the error?
2

I'm currently working with the R307 too, i haven't found that problem, post the code so we can see what are you actually doing :slight_smile:

3

The code i was using is present in ada fruit library.

/***************************************************
This is an example sketch for our optical Fingerprint sensor

Designed specifically to work with the Adafruit BMP085 Breakout
----> Fingerprint sensor : ID 751 : $49.95 : Adafruit Industries, Unique & fun DIY electronics and kits

These displays use TTL Serial to communicate, 2 pins are required to
interface
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!

Written by Limor Fried/Ladyada for Adafruit Industries.
BSD license, all text above must be included in any redistribution
****************************************************/

#include <Adafruit_Fingerprint.h>

// On Leonardo/Micro or others with hardware serial, use those! #0 is green wire, #1 is white
// uncomment this line:
// #define mySerial Serial1

// For UNO and others without hardware serial, we must use software serial...
// pin #2 is IN from sensor (GREEN wire)
// pin #3 is OUT from arduino (WHITE wire)
// comment these two lines if using hardware serial
SoftwareSerial mySerial(2, 3);

Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

uint8_t id;

void setup()
{
Serial.begin(9600);
while (!Serial); // For Yun/Leo/Micro/Zero/...
delay(100);
Serial.println("\n\nAdafruit Fingerprint sensor enrollment");

// set the data rate for the sensor serial port
finger.begin(57600);

if (finger.verifyPassword()) {
Serial.println("Found fingerprint sensor!");
} else {
Serial.println("Did not find fingerprint sensor :(");
while (1) { delay(1); }
}
}

uint8_t readnumber(void) {
uint8_t num = 0;

while (num == 0) {
while (! Serial.available());
num = Serial.parseInt();
}
return num;
}

void loop() // run over and over again
{
Serial.println("Ready to enroll a fingerprint!");
Serial.println("Please type in the ID # (from 1 to 127) you want to save this finger as...");
id = readnumber();
if (id == 0) {// ID #0 not allowed, try again!
return;
}
Serial.print("Enrolling ID #");
Serial.println(id);

while (! getFingerprintEnroll() );
}

uint8_t getFingerprintEnroll() {

int p = -1;
Serial.print("Waiting for valid finger to enroll as #"); Serial.println(id);
while (p != FINGERPRINT_OK) {
p = finger.getImage();
switch (p) {
case FINGERPRINT_OK:
Serial.println("Image taken");
break;
case FINGERPRINT_NOFINGER:
Serial.println(".");
break;
case FINGERPRINT_PACKETRECIEVEERR:
Serial.println("Communication error");
break;
case FINGERPRINT_IMAGEFAIL:
Serial.println("Imaging error");
break;
default:
Serial.println("Unknown error");
break;
}
}

// OK success!

p = finger.image2Tz(1);
switch (p) {
case FINGERPRINT_OK:
Serial.println("Image converted");
break;
case FINGERPRINT_IMAGEMESS:
Serial.println("Image too messy");
return p;
case FINGERPRINT_PACKETRECIEVEERR:
Serial.println("Communication error");
return p;
case FINGERPRINT_FEATUREFAIL:
Serial.println("Could not find fingerprint features");
return p;
case FINGERPRINT_INVALIDIMAGE:
Serial.println("Could not find fingerprint features");
return p;
default:
Serial.println("Unknown error");
return p;
}

Serial.println("Remove finger");
delay(2000);
p = 0;
while (p != FINGERPRINT_NOFINGER) {
p = finger.getImage();
}
Serial.print("ID "); Serial.println(id);
p = -1;
Serial.println("Place same finger again");
while (p != FINGERPRINT_OK) {
p = finger.getImage();
switch (p) {
case FINGERPRINT_OK:
Serial.println("Image taken");
break;
case FINGERPRINT_NOFINGER:
Serial.print(".");
break;
case FINGERPRINT_PACKETRECIEVEERR:
Serial.println("Communication error");
break;
case FINGERPRINT_IMAGEFAIL:
Serial.println("Imaging error");
break;
default:
Serial.println("Unknown error");
break;
}
}

// OK success!

p = finger.image2Tz(2);
switch (p) {
case FINGERPRINT_OK:
Serial.println("Image converted");
break;
case FINGERPRINT_IMAGEMESS:
Serial.println("Image too messy");
return p;
case FINGERPRINT_PACKETRECIEVEERR:
Serial.println("Communication error");
return p;
case FINGERPRINT_FEATUREFAIL:
Serial.println("Could not find fingerprint features");
return p;
case FINGERPRINT_INVALIDIMAGE:
Serial.println("Could not find fingerprint features");
return p;
default:
Serial.println("Unknown error");
return p;
}

// OK converted!
Serial.print("Creating model for #"); Serial.println(id);

p = finger.createModel();
if (p == FINGERPRINT_OK) {
Serial.println("Prints matched!");
} else if (p == FINGERPRINT_PACKETRECIEVEERR) {
Serial.println("Communication error");
return p;
} else if (p == FINGERPRINT_ENROLLMISMATCH) {
Serial.println("Fingerprints did not match");
return p;
} else {
Serial.println("Unknown error");
return p;
}

Serial.print("ID "); Serial.println(id);
p = finger.storeModel(id);
if (p == FINGERPRINT_OK) {
Serial.println("Stored!");
} else if (p == FINGERPRINT_PACKETRECIEVEERR) {
Serial.println("Communication error");
return p;
} else if (p == FINGERPRINT_BADLOCATION) {
Serial.println("Could not store in that location");
return p;
} else if (p == FINGERPRINT_FLASHERR) {
Serial.println("Error writing to flash");
return p;
} else {
Serial.println("Unknown error");
return p;
}
}

4

The sensor itself is doing the enrolment and the storage of fingerprint images.

I have three of them and none of them actually work properly. After a dozen tries one or two fingers may get accepted, after which they sometimes recognise the enrolled fingerprints, most of the tries not. These sensors are probably simply crap. In my experience detection rates are FAR too low to make them even suitable for a demo.

5

Any help on deleting fingerprint model. it is always successful when deleting even the location or id is not already enrolled.

6

Dear Friends,

I too had the same problem, but then got resolved. The actual process which takes place is that:

  1. When you place your finger on the fingerprint scanner during the enrollment process, the device immediately captures the fingerprint without any delay, but when you place your finger for the second time your fingerprint appears much more clear in the scanner. Hence it gets mismatch. I identified this using SFGDEMO software installed in my laptop.

  2. So what you have to do is, in the finger enrollment code just add delay of 1000 ms for the first fingerprint capture and for the second one also add same delay of 1000 in the code for image capturing process code.

Now run it, the problem will be cleared.

7

the problem is solved, but now machine go for infinite loop and ask again for fingerprint for that same id again

8

Hello everybody,
I am working on an election program where voting is based on biometric. I have bought this r307 scanner. It works perfect but the problem is that I want to store the fingerprints in the database. Is there any wayto store fingerprints into sql database using this r307 scanner.

9

No.