Quartz Components
Published © CC BY-NC

IoT Based Biometric Door Lock using Fingerprint Sensor

Here we build an IoT Based Biometric Security System using the GT5111C3 fingerprint sensor, NodeMCU and Solenoid Lock.

IntermediateFull instructions provided6 hours4,914
IoT Based Biometric Door Lock using Fingerprint Sensor

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board
NodeMCU ESP8266 Breakout Board
×1
GT511C3 Fingerprint Sensor
×1
Solenoid Lock
×1
Relay Module (Generic)
×1
Buzzer
Buzzer
×1
12V Adapter
×1
Jumper wires (generic)
Jumper wires (generic)
×1
Breadboard (generic)
Breadboard (generic)
×1

Software apps and online services

Adafruit IO

Story

Read more

Schematics

Biometric Door Lock Circuit Diagram

Code

IoT Based Biometric Door Lock

Arduino
#include "FPS_GT511C3.h"
#include "SoftwareSerial.h"
#include <ESP8266WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

const char *ssid =  "Galaxy-M20";     // Enter your WiFi Name
const char *pass =  "ac312124"; // Enter your WiFi Password

String msg;
char msg1[20];
WiFiClient client;

#define MQTT_SERV "io.adafruit.com"
#define MQTT_PORT 1883
#define MQTT_NAME "choudharyas"
#define MQTT_PASS "988c4e045ef64c1b9bc8b5bb7ef5f2d9"

void send_event(const char *event);
const char *host = "maker.ifttt.com";
const char *privateKey = "hUAAAz0AVvc6-NW1UmqWXXv6VQWmpiGFxx3sV5rnaM9";


FPS_GT511C3 fps(D6, D5); 
#define relay D1
#define buzzer D2

Adafruit_MQTT_Client mqtt(&client, MQTT_SERV, MQTT_PORT, MQTT_NAME, MQTT_PASS);
//Set up the feed you'r publishing to
Adafruit_MQTT_Publish Fingerprint = Adafruit_MQTT_Publish(&mqtt,MQTT_NAME "/f/Fingerprint");


void setup()
{
  Serial.begin(9600); //set up Arduino's hardware serial UART
  delay(100);
  fps.Open();         //send serial command to initialize fps
  fps.SetLED(true);   //turn on LED so fps can see fingerprint
  pinMode(relay, OUTPUT);
  pinMode(buzzer, OUTPUT);
  digitalWrite(relay, LOW); // keep motor off initally

  Serial.println("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(500);
    Serial.print(".");              // print ... till not connected
  }
  Serial.println("");
  Serial.println("WiFi connected");
}

void loop()
{
  MQTT_connect();
  // Identify fingerprint test
  if (fps.IsPressFinger())
  {
    fps.CaptureFinger(false);
    int id = fps.Identify1_N();
    
     if (id ==7) //<- change id value depending model you are using
     {
      Serial.print("Ashish Entered");
      Buzzer();
      digitalWrite(relay, HIGH);
      delay(6000);
      digitalWrite(relay, LOW);
      msg = "Ashish Entered";
      msg.toCharArray(msg1, 20);
      if (! Fingerprint.publish(msg1))
        {                     
         //delay(7000);   
          }
         }
     else if (id ==8)
       {
        Serial.print("Manoj Entered");
        Buzzer();
        digitalWrite(relay, HIGH);
        delay(6000);
        digitalWrite(relay, LOW);
        msg = "Manoj Entered";
        msg.toCharArray(msg1, 20);
        if (! Fingerprint.publish(msg1))
        {                     
         //delay(7000);   
          }
       }

     else if (id ==9)
       {
        Serial.print("Aswinth Entered");
        Buzzer();
        digitalWrite(relay, HIGH);
        delay(6000);
        digitalWrite(relay, LOW);
        msg = "Aswinth Entered";
        msg.toCharArray(msg1, 20);
        if (! Fingerprint.publish(msg1))
        {                     
         //delay(7000);   
          }
       }
      
    
     else
      {//if unable to recognize
       send_event("login_event");
       Serial.println("Finger not found");
       for(int i = 7; i > 0; i--){
        digitalWrite(buzzer, HIGH);
        delay(100);
        digitalWrite(buzzer, LOW);
        delay(100);
       }

    }
  }
  else
  {
    Serial.println("Please press finger");
  }
  delay(100);

 
}

void send_event(const char *event)
{
  Serial.print("Connecting to ");
  Serial.println(host);
  
  // Use WiFiClient class to create TCP connections
  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(host, httpPort)) {
    Serial.println("Connection failed");
    return;
  }
  
  // We now create a URI for the request
  String url = "/trigger/";
  url += event;
  url += "/with/key/";
  url += privateKey;
  
  Serial.print("Requesting URL: ");
  Serial.println(url);
  
  // This will send the request to the server
  client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" + 
               "Connection: close\r\n\r\n");
  while(client.connected())
  {
    if(client.available())
    {
      String line = client.readStringUntil('\r');
      Serial.print(line);
    } else {
      // No data yet, wait a bit
      delay(50);
    };
  }
  
  Serial.println();
  Serial.println("closing connection");
  client.stop();
}

void MQTT_connect() 
{
  int8_t ret;

  // Stop if already connected.
  if (mqtt.connected()) 
  {
    return;
  }

  uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) // connect will return 0 for connected
  { 
       
       mqtt.disconnect();
       delay(5000);  // wait 5 seconds
       retries--;
       if (retries == 0) 
       {
         // basically die and wait for WDT to reset me
         while (1);
       }
  }
}

void Buzzer()
{
  digitalWrite(buzzer, HIGH);
  delay(1000);
  digitalWrite(buzzer, LOW);
}

Credits

Quartz Components

Quartz Components

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Related channels and tags
  • Espressif
  • Internet of Things
  • NodeMCU