Adafruit Fingerprint Print Hex

Other Hardware Sensors
1

Hi! I am trying to print the hex of the fingerprint from the fingerprint sensor. The example of Adafruit for this is printing the hex of the templates stored in the sensor itself. What I want to do is to print the hex of the current finger on the fingerprint sensor.

Can you guys help?

2

Which sketch are you using? Show it here. Also, tell what controller you are using and show how the fingerprint device is connected.

3

This is the example from adafruit that prints the hex of the fingerprint template. Currently, this is what I'm referencing at.

printHex() is what prints the hex code, and downloadFingerPrintTemplate() retrieves the template.

#include <Adafruit_Fingerprint.h>

SoftwareSerial mySerial(2, 3);

Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

int getFingerprintIDez();

void setup()
{
  while (!Serial);
  Serial.begin(9600);
  Serial.println("Fingerprint template extractor");

  // 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);
  }

  // Try to get the templates for fingers 1 through 10
  for (int finger = 1; finger < 10; finger++) {
    downloadFingerprintTemplate(finger);
  }
}

uint8_t downloadFingerprintTemplate(uint16_t id)
{
  Serial.println("------------------------------------");
  Serial.print("Attempting to load #"); Serial.println(id);
  uint8_t p = finger.loadModel(id);
  switch (p) {
    case FINGERPRINT_OK:
      Serial.print("Template "); Serial.print(id); Serial.println(" loaded");
      break;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    default:
      Serial.print("Unknown error "); Serial.println(p);
      return p;
  }

  // OK success!

  Serial.print("Attempting to get #"); Serial.println(id);
  p = finger.getModel();
  switch (p) {
    case FINGERPRINT_OK:
      Serial.print("Template "); Serial.print(id); Serial.println(" transferring:");
      break;
    default:
      Serial.print("Unknown error "); Serial.println(p);
      return p;
  }

  // one data packet is 267 bytes. in one data packet, 11 bytes are 'usesless' :D
  uint8_t bytesReceived[534]; // 2 data packets
  memset(bytesReceived, 0xff, 534);

  uint32_t starttime = millis();
  int i = 0;
  while (i < 534 && (millis() - starttime) < 20000) {
    if (mySerial.available()) {
      bytesReceived[i++] = mySerial.read();
    }
  }
  Serial.print(i); Serial.println(" bytes read.");
  Serial.println("Decoding packet...");

  uint8_t fingerTemplate[512]; // the real template
  memset(fingerTemplate, 0xff, 512);

  // filtering only the data packets
  int uindx = 9, index = 0;
  memcpy(fingerTemplate + index, bytesReceived + uindx, 256);   // first 256 bytes
  uindx += 256;       // skip data
  uindx += 2;         // skip checksum
  uindx += 9;         // skip next header
  index += 256;       // advance pointer
  memcpy(fingerTemplate + index, bytesReceived + uindx, 256);   // second 256 bytes

  for (int i = 0; i < 512; ++i) {
    //Serial.print("0x");
    printHex(fingerTemplate[i], 2);
    //Serial.print(", ");
  }
  Serial.println("\ndone.");

  return p;

  /*
    uint8_t templateBuffer[256];
    memset(templateBuffer, 0xff, 256);  //zero out template buffer
    int index=0;
    uint32_t starttime = millis();
    while ((index < 256) && ((millis() - starttime) < 1000))
    {
    if (mySerial.available())
    {
      templateBuffer[index] = mySerial.read();
      index++;
    }
    }

    Serial.print(index); Serial.println(" bytes read");

    //dump entire templateBuffer.  This prints out 16 lines of 16 bytes
    for (int count= 0; count < 16; count++)
    {
    for (int i = 0; i < 16; i++)
    {
      Serial.print("0x");
      Serial.print(templateBuffer[count*16+i], HEX);
      Serial.print(", ");
    }
    Serial.println();
    }*/
}



void printHex(int num, int precision) {
  char tmp[16];
  char format[128];

  sprintf(format, "%%.%dX", precision);

  sprintf(tmp, format, num);
  Serial.print(tmp);
}

void loop()
{}

I am using Arduino UNO R3, RX and TX pins of the sensor are at the 2 & 3 digital pins.

I have this as my current sketch, which is pretty empty.

#include <Adafruit_Fingerprint.h>
SoftwareSerial mySerial(2, 3);
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

int getFingerprintIDez();
int fingerprintPresence = 0;
void setup() {
  Serial.begin(9600);
  finger.begin(57600);

  while(fingerprintPresence == 0){
    if (finger.verifyPassword()) {
      //TODO: Change the message to number code
      Serial.println("Fingerprint sensor present");
      fingerprintPresence = 1;
    }
  }  
}

void loop() {
  
}

void printHex(int num) {
  char tmp[16];
  char format[128];

  sprintf(format, "%%.%dX", 1);

  sprintf(tmp, format, num);
  Serial.print(tmp);
}
4

I do not see storing the fingerprint.

5

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