I have a problem when transferring Fingerprint template to another fingerprint sensor

Projects Programming
1

I'm using Capacitive Fingerprint Sensor. The transfer is success, but only the first template only i can access in both sensor. The other template is not accessible in second sensor.

THIS IS MY FUNCTIONS

void setAccessMode(Adafruit_Fingerprint &finger, const String &fingerName) {
int p = finger.getImage();
    if (p == FINGERPRINT_NOFINGER) {
        return;  // No finger detected
    } else if (p != FINGERPRINT_OK) {
        Serial.println("Error capturing image from " + fingerName + ". Code: " + String(p));
        return;
    }

    p = finger.image2Tz();
    if (p != FINGERPRINT_OK) {
        Serial.println("Error processing the fingerprint from " + fingerName + ". Code: " + String(p));
        return;
    }

    p = finger.fingerSearch();
    if (p == FINGERPRINT_OK) {
        Serial.println("Access Granted for " + fingerName);
        Serial.print("Found ID #");
        Serial.println(finger.fingerID);
        // Handle access granted logic here

    } else if (p == FINGERPRINT_NOTFOUND) {
        Serial.println("Access Denied. " + fingerName + " fingerprint not found.");
        // Handle access denied logic here

    } else {
        Serial.println("Access Denied for " + fingerName + ". Code: " + String(p));
    }
}

void processFingerprints() {
    // Check for access on both fingerprints
    setAccessMode(finger1, "Finger1");
    setAccessMode(finger2, "Finger2");
}

void setRegisterMode() {
  Serial.println("Switching to register mode.");
  // lcd.setCursor(1, 1);
  // lcd.print("  Registering  ");

  while (true) {
    updateTemplateCount();

    int id = fingerEnroll();
    if (id != -1) {
      Serial.print("Fingerprint enrolled successfully with ID: ");
      Serial.println(id);

       // Transfer model from finger1 to finger2
    if (transferFingerprint(id)) {
        Serial.println("Fingerprint successfully transferred to second sensor.");
    } else {
        Serial.println("Error transferring fingerprint to second sensor.");
    }

      updateTemplateCount();
      // lcd.setCursor(1, 1);
      // lcd.print("Register Success");
      finger1.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_GREEN, 0); // Set LED to flashing green
      delay(2000);
      // lcd.setCursor(1, 1);
      // lcd.print("                ");
      finger1.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_CYAN, 0); // Set LED to flashing green

      Serial.print("Templates after enrollment: ");
      Serial.println(finger1.templateCount);
    
      break; // Exit the loop if enrollment is successful
    } else {
      Serial.println("Fingerprint enrollment failed. Trying again...");
    }
  }
}

bool transferFingerprint(int id) {
    Serial.print("Transferring fingerprint ID: ");
    Serial.println(id);

    // Load the model from the first sensor
    int p = finger1.loadModel(id);
    if (p != FINGERPRINT_OK) {
        Serial.print("Error loading model from sensor 1. Code: ");
        Serial.println(p);
        return false;  // Return false if loading fails
    }

    // Read the loaded fingerprint from the first sensor
    // If the library provides a method to read the fingerprint data,
    // you would use it here. Otherwise, proceed to store it in the second sensor.

    // Retry mechanism for storing fingerprint on the second sensor
    int retries = 5;
    bool success = false;

    while (retries > 0 && !success) {
        Serial.println("Attempting to store model on sensor 2...");

        // Store the model directly on the second sensor
        p = finger2.storeModel(id);
        if (p == FINGERPRINT_OK) {
            Serial.println("Fingerprint transferred and stored successfully on sensor 2.");
            success = true;
        } else {
            Serial.print("Error storing model into sensor 2. Code: ");
            Serial.println(p);
            Serial.println("Retrying...");
            retries--;
            delay(2000);  // Wait before retrying
        }
    }

    if (!success) {
        Serial.println("Failed to store fingerprint on sensor 2 after 5 retries.");
    }

    return success;
}
2

Post complete sketch.
This does not compile.
This does not contain setup() or loop()

3

this is all my code

#include <Adafruit_Fingerprint.h>
#include <SoftwareSerial.h>
#include <Wire.h>


// #include <RTClib.h>
// RTC_DS1307 rtc;

// #include <LiquidCrystal_I2C.h>
// LiquidCrystal_I2C lcd(0x27, 16, 2);

#define rly_1 50
#define rly_2 52

#define power1 22
#define power2 24

// Define LED color values
#define FINGERPRINT_LED_RED 1
#define FINGERPRINT_LED_BLUE 2
#define FINGERPRINT_LED_PURPLE 3
#define FINGERPRINT_LED_GREEN 4
#define FINGERPRINT_LED_CYAN 6
#define FINGERPRINT_LED_YELLOW 5
#define FINGERPRINT_LED_WHITE 7

// // Define software serial pins for fingerprint sensor
// SoftwareSerial mySerial1(10, 11);
// SoftwareSerial mySerial3(12, 13);
// Initialize fingerprint sensor
Adafruit_Fingerprint finger2 = Adafruit_Fingerprint(&Serial1);
Adafruit_Fingerprint finger1 = Adafruit_Fingerprint(&Serial3);

String data, datas;
int id = 1;

void setup() {
  Serial.begin(9600);  // Start the serial communication with the PC
  pinMode(power1, OUTPUT); digitalWrite(power1, LOW);
  pinMode(power2, OUTPUT); digitalWrite(power2, LOW);
  delay(1000);



  Serial2.begin(57600);
  delay(1000);


  finger1.begin(57600);
  delay(1000);
  finger2.begin(57600);
  delay(1000);
  // lcd.begin(16,2);
  // lcd.backlight();
  // lcd.clear();

  pinMode(rly_1, OUTPUT); digitalWrite(rly_1, 1);
  pinMode(rly_2, OUTPUT); digitalWrite(rly_2, 1);



  // //Initialize RTC
  // if (!rtc.begin()) {
  //   Serial.println("Couldn't find RTC");
  //   lcd.setCursor(0, 0);
  //   lcd.print("Couldn't find RTC");
  //   while (1);
  // }

  // if (!rtc.isrunning()) {
  //   Serial.println("RTC is NOT running!");
  //   // Set the date and time to the date and time this sketch was compiled
  //   rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  // }

  // Initialize the fingerprint sensor
//  mySerial1.listen();
  if (finger1.verifyPassword()) {
    Serial.println("Fingerprint sensor 1 initialized.");
  } else {
    Serial.println("Fingerprint sensor 1 initialization failed.");
    while (1);  // Halt the program if sensor initialization fails
  }

  // mySerial3.listen();
  if (finger2.verifyPassword()) {
    Serial.println("Fingerprint sensor 2 initialized.");
  } else {
    Serial.println("Fingerprint sensor 2 initialization failed.");
    while (1);  // Halt the program if sensor initialization fails
  }
  
  updateTemplateCount();
  
  // finger1.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_CYAN, 0);
  // finger2.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_CYAN, 0);
}
void loop() {
  //  DateTime now = rtc.now();

  // //Display the time
  // lcd.setCursor(1, 0);
  // lcd.print("Time: ");
  // if (now.hour() < 10) lcd.print('0');  // Add leading zero if needed
  // lcd.print(now.hour());
  // lcd.print(':');
  // if (now.minute() < 10) lcd.print('0');  // Add leading zero if needed
  // lcd.print(now.minute());
  // lcd.print(':');
  // if (now.second() < 10) lcd.print('0');  // Add leading zero if needed
  // lcd.print(now.second());
  // delay(500);

  if (Serial.available() > 0) {
    int command = Serial.parseInt();  // Read the incoming integer
    if (command == 1) {
      setRegisterMode();
    } else if (command == 2) {

      deleteFingerprint();
    }
  } 
  else {
    processFingerprints();
  }

  if (Serial2.available() > 0){
    String serial = Serial2.readStringUntil('\n');  
    serial.trim();  
    Serial.println(serial); 

    if (serial == "TimeIn") {
      // lcd.setCursor(1,1);
      // lcd.print(" Access Granted! ");
      finger1.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_GREEN, 0); // Set LED to flashing green
      delay(3000);
      finger1.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_CYAN, 0); // Turn off the LED
      // lcd.setCursor(1,1);
      // lcd.print("               ");
      digitalWrite(rly_1, 0);  
      digitalWrite(rly_2, 0);  
      Serial.println("Door Open");

      // lcd.setCursor(1,1);
      // lcd.print("               ");
      // lcd.setCursor(1,1);
      // lcd.print("    Time In    ");
      // delay(5000);
      // lcd.setCursor(1,1);
      // lcd.print("               ");
    }

    if (serial == "TimeOut"){
      finger1.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_GREEN, 0); // Set LED to flashing green
      delay(3000);
      finger1.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_CYAN, 0); // Turn off the LED
      // lcd.setCursor(1,1);
      // lcd.print("               ");
      // lcd.setCursor(1,1);
      // lcd.print("    Time Out    "); 
      digitalWrite(rly_1, 1);  
      digitalWrite(rly_2, 1);  
      Serial.println("Door Close");
      delay(5000);
      // lcd.setCursor(1,1);
      // lcd.print("               ");
    }

    if (serial == "register"){  
      setRegisterMode();
    }
  }
  delay(500); 
}


void updateTemplateCount() {
  finger1.getTemplateCount();
  finger2.getTemplateCount();

  if (finger1.templateCount == 0) {
    Serial.println("No templates found on Finger 1.");
  } else {
    Serial.print("Templates available on Finger 1: ");
    Serial.println(finger1.templateCount);
  }
  if (finger2.templateCount == 0) {
    Serial.println("No templates found on Finger 2.");
  } else {
    Serial.print("Templates available on Finger 2: ");
    Serial.println(finger2.templateCount);
  }
}

void setAccessMode(Adafruit_Fingerprint &finger, const String &fingerName) {
  // int p = finger.getImage();
  // if (p == FINGERPRINT_NOFINGER) {
  //   return;  // No finger detected
  // } else if (p != FINGERPRINT_OK) {
  //   Serial.println("Error capturing image from " + fingerName + ". Code: " + String(p));
  //   return;
  // }

  // p = finger.image2Tz();
  // if (p != FINGERPRINT_OK) {
  //   Serial.println("Error processing the fingerprint from " + fingerName + ". Code: " + String(p));
  //   return;
  // }

  // p = finger.fingerSearch();
  // if (p == FINGERPRINT_OK) {
  //   Serial.println("Access Granted for " + fingerName);
  //   Serial.print("Found ID #");
  //   Serial.println(finger.fingerID);
  //   String data = "!/fingerprint/checkAccess.php";
  //   data += "?fingerprint_id=";
  //   data += String(finger.fingerID);
  //   data += "@";
  //   Serial2.println(data);
  //   Serial.println(data);
  //   Serial.print("Found a match! " + fingerName + " ID: "); Serial.println(finger.fingerID);
  //   finger.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_PURPLE, 0);
  //   // lcd.setCursor(1, 1);
  //   // lcd.print("Processing ....");

  // } else if (p == FINGERPRINT_NOTFOUND) {
  //   Serial.println("Access Denied. " + fingerName + " fingerprint not found.");
  //   finger.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_RED, 0); // Set LED to flashing red
  //   delay(2000);
  //   finger.LEDcontrol(FINGERPRINT_LED_OFF, 0, 0, 0); // Turn off the LED
  //   finger.getImage(); // Optionally, reset the fingerprint sensor state

  // } else {
  //   Serial.println("Access Denied for " + fingerName + ". Code: " + String(p));
  //   finger.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_RED, 0); // Set LED to flashing red
  //   delay(2000);
  //   finger.LEDcontrol(FINGERPRINT_LED_OFF, 0, 0, 0); // Turn off the LED
  //   finger.getImage(); // Optionally, reset the fingerprint sensor state
  // }
  int p = finger.getImage();
    if (p == FINGERPRINT_NOFINGER) {
        return;  // No finger detected
    } else if (p != FINGERPRINT_OK) {
        Serial.println("Error capturing image from " + fingerName + ". Code: " + String(p));
        return;
    }

    p = finger.image2Tz();
    if (p != FINGERPRINT_OK) {
        Serial.println("Error processing the fingerprint from " + fingerName + ". Code: " + String(p));
        return;
    }

    p = finger.fingerSearch();
    if (p == FINGERPRINT_OK) {
        Serial.println("Access Granted for " + fingerName);
        Serial.print("Found ID #");
        Serial.println(finger.fingerID);
        // Handle access granted logic here

    } else if (p == FINGERPRINT_NOTFOUND) {
        Serial.println("Access Denied. " + fingerName + " fingerprint not found.");
        // Handle access denied logic here

    } else {
        Serial.println("Access Denied for " + fingerName + ". Code: " + String(p));
    }
}

void processFingerprints() {
    // Check for access on both fingerprints
    setAccessMode(finger1, "Finger1");
    setAccessMode(finger2, "Finger2");
}


void setRegisterMode() {
  Serial.println("Switching to register mode.");
  // lcd.setCursor(1, 1);
  // lcd.print("  Registering  ");

  while (true) {
    updateTemplateCount();

    int id = fingerEnroll();
    if (id != -1) {
      Serial.print("Fingerprint enrolled successfully with ID: ");
      Serial.println(id);

       // Transfer model from finger1 to finger2
    if (transferFingerprint(id)) {
        Serial.println("Fingerprint successfully transferred to second sensor.");
    } else {
        Serial.println("Error transferring fingerprint to second sensor.");
    }

      // datas = "!/scheduler/add_fingerprint.php";
      // datas += "?fingerprintId=";
      // datas += String(id);
      // datas += "@";

      // Serial2.println(datas);
      // Serial.println(datas);

      updateTemplateCount();
      // lcd.setCursor(1, 1);
      // lcd.print("Register Success");
      finger1.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_GREEN, 0); // Set LED to flashing green
      delay(2000);
      // lcd.setCursor(1, 1);
      // lcd.print("                ");
      finger1.LEDcontrol(FINGERPRINT_LED_ON, 0, FINGERPRINT_LED_CYAN, 0); // Set LED to flashing green

      Serial.print("Templates after enrollment: ");
      Serial.println(finger1.templateCount);
    
      break; // Exit the loop if enrollment is successful
    } else {
      Serial.println("Fingerprint enrollment failed. Trying again...");
    }
  }
}


int fingerEnroll() {
  int p = -1;

  // lcd.setCursor(1, 1);
  // lcd.print("  Place Finger  ");
  Serial.println("Place your finger on the sensor.");

  while (p != FINGERPRINT_OK) {
    p = finger1.getImage();
    if (p != FINGERPRINT_OK && p != FINGERPRINT_NOFINGER) {
      Serial.println("Error capturing image. Code: " + String(p));
      // lcd.setCursor(1, 1);
      // lcd.print("     Error     ");
      return -1;
    }
  }

  p = finger1.image2Tz(1);
  if (p != FINGERPRINT_OK) {
    // lcd.setCursor(1, 1);
    // lcd.print("     Error     ");
    Serial.println("Error processing the fingerprint. Code: " + String(p));
    return -1;
  }

  // lcd.setCursor(1, 1);
  // lcd.print(" Remove Finger  ");
  Serial.println("Remove your finger.");
  delay(2000);

  p = 0;
  while (p != FINGERPRINT_NOFINGER) {
    p = finger1.getImage();
  }

  // lcd.setCursor(1, 1);
  // lcd.print("  Place Again  ");
  Serial.println("Place the same finger again.");
  p = -1;
  while (p != FINGERPRINT_OK) {
    p = finger1.getImage();
    if (p != FINGERPRINT_OK && p != FINGERPRINT_NOFINGER) {
      Serial.println("Error capturing image. Code: " + String(p));
      return -1;
    }
  }

  p = finger1.image2Tz(2);
  if (p != FINGERPRINT_OK) {
    Serial.println("Error processing the fingerprint. Code: " + String(p));
    // lcd.setCursor(1, 1);
    // lcd.print("     Error     ");
    return -1;
  }

  p = finger1.createModel();
  if (p != FINGERPRINT_OK) {
    Serial.println("Error creating model. Code: " + String(p));
    // lcd.setCursor(1, 1);
    // lcd.print("     Error     ");
    return -1;
  }
  // After storing the fingerprint model
    int id = finger1.templateCount + 1; // ID should be based on current count
    p = finger1.storeModel(id); // Store with the new ID
    if (p != FINGERPRINT_OK) {
        Serial.println("Error storing model. Code: " + String(p));
        return -1;
    }
    
    // Add this line to see the stored ID
    Serial.print("Stored fingerprint with ID: ");
    Serial.println(id);

    return id; // Return the new ID
}

void deleteFingerprint() {
  uint8_t p = finger1.emptyDatabase();
  if (p != FINGERPRINT_OK) {
    Serial.print("Failed to delete templates from Finger1. Error: ");
    Serial.println(p);
  }
  else{
    Serial.println("All fingerprint deleted successfully");
  }

  p = finger2.emptyDatabase();  
  if (p != FINGERPRINT_OK) {
    Serial.print("Failed to delete templates from Finger2. Error: ");
    Serial.println(p);
  }
  else{
    Serial.println("All fingerprint deleted successfully");
  }
  updateTemplateCount();
}

bool transferFingerprint(int id) {
    Serial.print("Transferring fingerprint ID: ");
    Serial.println(id);

    // Load the model from the first sensor
    int p = finger1.loadModel(id);
    if (p != FINGERPRINT_OK) {
        Serial.print("Error loading model from sensor 1. Code: ");
        Serial.println(p);
        return false;  // Return false if loading fails
    }

    // Read the loaded fingerprint from the first sensor
    // If the library provides a method to read the fingerprint data,
    // you would use it here. Otherwise, proceed to store it in the second sensor.

    // Retry mechanism for storing fingerprint on the second sensor
    int retries = 5;
    bool success = false;

    while (retries > 0 && !success) {
        Serial.println("Attempting to store model on sensor 2...");

        // Store the model directly on the second sensor
        p = finger2.storeModel(id);
        if (p == FINGERPRINT_OK) {
            Serial.println("Fingerprint transferred and stored successfully on sensor 2.");
            success = true;
        } else {
            Serial.print("Error storing model into sensor 2. Code: ");
            Serial.println(p);
            Serial.println("Retrying...");
            retries--;
            delay(2000);  // Wait before retrying
        }
    }

    if (!success) {
        Serial.println("Failed to store fingerprint on sensor 2 after 5 retries.");
    }

    return success;
}
4

sorry, all my code is posted

5

Show a wiring diagram of your project.

Should you be using "finger1." or "finger2." rather than "finger."? (I do not see an object created for "finger."

Also, what do you see on your Serial Monitor while the failure occurs?

This bit of confusing code might be one issue later... you use Serial1 for finger2 and Serial3 for finger1. Why not use Serial3 for the Serial Monitor input, and Serial1 for finger1, Serial2 for finger2?

Adafruit_Fingerprint finger2 = Adafruit_Fingerprint(&Serial1);
Adafruit_Fingerprint finger1 = Adafruit_Fingerprint(&Serial3);

This will always pass or fail... what is the value of FINGERPRINT_OK?

  p = -1;
  while (p != FINGERPRINT_OK) {
6

Originally im using software serial and i change it to hardware serial. I have already the code for serial2 for connection to esp32.

There is no error the problem is only the first fingerprint template i can access for both sensor. The registered fingerprint after the first template is not accessible in the second sensor.