Fingerprint Lock Using Arduino Mega 2560

Introduction

In this article I will explain how to create a Fingerprint Lock using Arduino Mega 2560. It will be used to identify the same user in the same way that a fingerprint scanner works.

 

Parts

• Fingerprint sensor
• Arduino Mega 2560 
• Servo motor
• Jumper wires

Fingerprint Sensor
 
Figure 1: Fingerprint Sensor 

• It is an electronic device and capture the digital images.
• The captured image is called live scan. 
• It simply identifies the fingerprint and give the result.
• It can easily match the fingerprint.

Connection:

Step 1: Connection From Servo Motor To Arduino Mega 2560,

• The servo first pin can be connected to the Gnd.
• The second pin can be connected to the VCC.
• The third pin can be connected to the digital pin 06 of the Arduino Mega 2560. 

Step 2: Connection From Fingerprint Sensor To Arduino Mega 2560,

• The Gnd pin of fingerprint sensor to the Gnd of the Arduino Mega 2560
• The Vcc pin of  fingerprint sensor to the 5v of the Arduino Mega 2560
• The Rx pin can be connected to the A4 of the Arduino Mega 2560.
• The Tx pin can be connected to the A5 of the Arduino Mega 2560. 

Programming

#include <Fingerprint.h>
#include <SoftwareSerial.h>
#include <Streaming.h>
#include <Servo.h>

#define __Debug         1                               // if debug mode

const int pinServo      = 6;                            // servo pin
const int angleServo    = 60;                           // Rotation angle

#if __Debug
#define DBG(X)          Serial.println(X)
#else
#define DBG(X)
#endif

SoftwareSerial mySerial(A5, A4);                                // tx, rx

Fingerprint finger = Fingerprint(&mySerial);
Servo myservo;                                                  // create servo object to control a servo

void open_close_door()
{
    myservo.attach(pinServo);
    for(int i=20; i<angleServo; i++)
    {
        myservo.write(i);
        delay(5);
    }

    delay(2000);

    for(int i=(angleServo-1); i>=20; i--)
    {
        myservo.write(i);
        delay(5);
    }
    myservo.detach();


}


void setup()
{

    Serial.begin(38400);
    finger.begin(19200);
    delay(500);
    DBG("setup ok!");
}

void loop()                     // run over and over again
{
    if(getFingerprintIDez()>=0)
    {
        open_close_door();
        DBG("get right finger, open door now!!");

        delay(2000);
    }
    delay(50);
}


// returns -1 if failed, otherwise returns ID #
int getFingerprintIDez()
{

    if (!finger.verifyPassword())
    {
        DBG("Did not find fingerprint sensor :(");
        return -1;
    }

    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;
    }

#if __Debug
    Serial.print("Found ID #");
    Serial.print(finger.fingerID);
    Serial.print(" with confidence of ");
    DBG(finger.confidence);
#endif

    return finger.fingerID;

}

Explanation:

• When the fingerprint isthe  same, the sensor identifies it and prints the message as matched.
• The servo motor also gets rotate to 60 degree direction.
• When fingerprints do not match, a message is sent as "Not Matched."

 

Output:


                          Figure 2: Output.

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