how to make Fingerprint door lock project / fingerprint sensor with arduino uno / Harish Projects

 full making video link - https://youtu.be/p_5H-3qjmEM

//Arduino Code//

#include <Adafruit_Fingerprint.h>

SoftwareSerial mySerial(2, 3);

Adafruit_Fingerprint finger = Adafruit_Fingerprint(&mySerial);

#define RELAY_PIN       4

#define ACCESS_DELAY    3000 // Keep lock unlocked for 3 seconds 

void setup()

{

  // set the data rate for the sensor serial port

  finger.begin(57600);

  delay(5);

  if (finger.verifyPassword()) 

  {

  } 

  else 

  {

    while (1) { delay(1); }

  }

  

  pinMode(RELAY_PIN, OUTPUT);

  digitalWrite(RELAY_PIN, HIGH);   //Switch off relay initially. Relay is LOW level triggered relay so we need to write HIGH.

}

void loop()

{

  if ( getFingerPrint() != -1)

  {

    digitalWrite(RELAY_PIN, LOW);

    delay(ACCESS_DELAY);

    digitalWrite(RELAY_PIN, HIGH);   

  }  

  delay(50);            //Add some delay before next scan.

}

// returns -1 if failed, otherwise returns ID #

int getFingerPrint() 

{

  int 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!

  return finger.fingerID;

}

//Project Diagram//