RoboCircuits
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Secure Your Projects with Fingerprint Sensors and Arduino

Fingerprint sensor tutorial

BeginnerFull instructions provided1 hour573
Secure Your Projects with Fingerprint Sensors and Arduino

Things used in this project

Hardware components

Fingerprint Sensor
DFRobot Fingerprint Sensor
×1
Arduino Nano R3
Arduino Nano R3
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)
Solder Wire, Lead Free
Solder Wire, Lead Free

Story

Read more

Schematics

Circuit

Code

Enroll code

Arduino
#include <Adafruit_Fingerprint.h>

// Create an Adafruit_Fingerprint object
Adafruit_Fingerprint finger = Adafruit_Fingerprint(&Serial);

void setup()  
{
  Serial.begin(9600);
  delay(100);
  Serial.println("Adafruit fingerprint sensor enrollment");

  // Initialize the fingerprint sensor
  if (!finger.begin(57600)) 
  {
    Serial.println("Couldn't find fingerprint sensor :(");
    while (1);
  }

  // Check if the sensor is connected
  if (finger.verifyPassword()) 
  {
    Serial.println("Found fingerprint sensor!");
  } 
  else 
  {
    Serial.println("Did not find fingerprint sensor :(");
    while (1);
  }
}

void loop()                     
{
  // Enroll a new fingerprint
  Serial.println("Place your finger on the sensor...");

  // Wait for a valid fingerprint
  while (! finger.getImage());
  Serial.println("Image taken");

  int result = finger.image2Tz(1);
  switch (result) 
  {
    case FINGERPRINT_OK:
      Serial.println("Image converted");
      break;
    case FINGERPRINT_NOFINGER:
      Serial.println("No finger detected");
      return;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return;
    default:
      Serial.println("Unknown error");
      return;
  }

  // Prompt the user to remove and reposition the same finger
  Serial.println("Remove your finger and reposition it...");
  delay(2000);

  // Wait for the user to place the same finger again
  Serial.println("Place the same finger on the sensor again...");

  // Wait for a valid fingerprint
  while (! finger.getImage());
  Serial.println("Image taken");

  result = finger.image2Tz(2);
  switch (result) 
  {
    case FINGERPRINT_OK:
      Serial.println("Image converted");
      break;
    case FINGERPRINT_NOFINGER:
      Serial.println("No finger detected");
      return;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return;
    default:
      Serial.println("Unknown error");
      return;
  }

  // Create a fingerprint template
  result = finger.createModel();
  if (result == FINGERPRINT_OK) 
  {
    Serial.println("Fingerprint enrolled successfully!");
  } 
  else 
  {
    Serial.println("Unknown error");
    return;
  }
}

Authentication

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

  Designed specifically to work with the Adafruit BMP085 Breakout
  ----> http://www.adafruit.com/products/751

  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>


#if (defined(__AVR__) || defined(ESP8266)) && !defined(__AVR_ATmega2560__)
// 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)
// Set up the serial port to use softwareserial..
SoftwareSerial mySerial(2, 3);

#else
// On Leonardo/M0/etc, others with hardware serial, use hardware serial!
// #0 is green wire, #1 is white
#define mySerial Serial1

#endif


Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

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

  // set the data rate for the sensor serial port
  finger.begin(57600);
  delay(5);
  if (finger.verifyPassword()) {
    Serial.println("Found fingerprint sensor!");
  } else {
    Serial.println("Did not find fingerprint sensor :(");
    while (1) { delay(1); }
  }

  Serial.println(F("Reading sensor parameters"));
  finger.getParameters();
  Serial.print(F("Status: 0x")); Serial.println(finger.status_reg, HEX);
  Serial.print(F("Sys ID: 0x")); Serial.println(finger.system_id, HEX);
  Serial.print(F("Capacity: ")); Serial.println(finger.capacity);
  Serial.print(F("Security level: ")); Serial.println(finger.security_level);
  Serial.print(F("Device address: ")); Serial.println(finger.device_addr, HEX);
  Serial.print(F("Packet len: ")); Serial.println(finger.packet_len);
  Serial.print(F("Baud rate: ")); Serial.println(finger.baud_rate);

  finger.getTemplateCount();

  if (finger.templateCount == 0) {
    Serial.print("Sensor doesn't contain any fingerprint data. Please run the 'enroll' example.");
  }
  else {
    Serial.println("Waiting for valid finger...");
      Serial.print("Sensor contains "); Serial.print(finger.templateCount); Serial.println(" templates");
  }
}

void loop()                     // run over and over again
{
  getFingerprintID();
  delay(50);            //don't ned to run this at full speed.
}

uint8_t getFingerprintID() {
  uint8_t p = finger.getImage();
  switch (p) {
    case FINGERPRINT_OK:
      Serial.println("Image taken");
      break;
    case FINGERPRINT_NOFINGER:
      Serial.println("No finger detected");
      return p;
    case FINGERPRINT_PACKETRECIEVEERR:
      Serial.println("Communication error");
      return p;
    case FINGERPRINT_IMAGEFAIL:
      Serial.println("Imaging error");
      return p;
    default:
      Serial.println("Unknown error");
      return p;
  }

  // OK success!

  p = finger.image2Tz();
  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!
  p = finger.fingerSearch();
  if (p == FINGERPRINT_OK) {
    Serial.println("Found a print match!");
  } else if (p == FINGERPRINT_PACKETRECIEVEERR) {
    Serial.println("Communication error");
    return p;
  } else if (p == FINGERPRINT_NOTFOUND) {
    Serial.println("Did not find a match");
    return p;
  } else {
    Serial.println("Unknown error");
    return p;
  }

  // found a match!
  Serial.print("Found ID #"); Serial.print(finger.fingerID);
  Serial.print(" with confidence of "); Serial.println(finger.confidence);

  return finger.fingerID;
}

// returns -1 if failed, otherwise returns ID #
int getFingerprintIDez() {
  uint8_t p = finger.getImage();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger.image2Tz();
  if (p != FINGERPRINT_OK)  return -1;

  p = finger.fingerFastSearch();
  if (p != FINGERPRINT_OK)  return -1;

  // found a match!
  Serial.print("Found ID #"); Serial.print(finger.fingerID);
  Serial.print(" with confidence of "); Serial.println(finger.confidence);
  return finger.fingerID;
}

Credits

RoboCircuits

RoboCircuits

37 projects • 216 followers
YouTuber, Explorer, Creator, Programmer, Arduino Lover and Engineer

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