Arduino Projects

Fingerprint Based Door Lock Using Bluetooth

step by step guide how to make Fingerprint Based Door Lock Using Bluetooth


In this article, we will be creating a fingerprint-based door lock system using Arduino Uno And Bluetooth HC-05 module. This project is a biometrics and wireless communication-based project and the project provides a secure and convenient way to control access to your door.

Components Needed

  1. Arduino Uno
  2. Blutooth Module(HC-05)
  3. Relay module
  4. Wires
  5. Zero PCB
  6. 9V power supply

Arduino Uno

  • The Arduino Uno used an ATmega328P microcontroller chip.
  • The ATmega328P operates clock speed of 16 MHz.
  • Flash memory 32KB.
  • SRAM of 2KB.
  • 1KB of EEPROM.


  • The Arduino Nano provides a total of 14 digital I/O pins.
  • 6 PIN used for PWM (Pulse Width Modulation) output.
  • 8 PIN analog input pins.
  • 10-bit resolution.

Blutooth Module(HC-05)

The Bluetooth module HC-05 is a popular wireless communication module that allows devices to establish a Bluetooth connection for data transmission. It is commonly used in electronics projects, such as robotics, home automation, and IoT applications.

Bluetooth Module
Bluetooth Module
  • Serial Communication: It communicates with other devices using UART (Universal Asynchronous Receiver-Transmitter) protocol.
  • Master and Slave Modes: The HC-05 module can operate in both master and slave modes. In the master mode, it can initiate connections with other Bluetooth devices, while in the slave mode, it can accept incoming connections from other Bluetooth devices.
  • LED Indicators: The HC-05 module has built-in status LEDs that indicate the module’s power status (ON/OFF) and Bluetooth connection status (pairing, connected).
  • Limited Range: Approximately 10 meters.

Relay module

A relay module is an integrated circuit board that incorporates a relay and additional components for easy integration into electronic projects.

It provides a convenient way to control higher voltage or current loads using a lower voltage signal, such as the output from a microcontroller or Arduino.

Smart Bike Helmet With Accident Alert System9

Circuit Diagram

  • Arduino Uno: This is the main microcontroller board that acts as the brain of the system. It controls the communication between the fingerprint sensor, Bluetooth module, and relay module.

circuit diagram 13

  • Bluetooth HC-05 Module: It connects to the Arduino Uno via TX and RX pins and communicates using the Serial interface.
  • Relay Module: The relay module is used to control the lock mechanism of the door. It is connected to a digital pin (7) of the Arduino Uno.

Source Code

Project Demo

Screenshot 2023 06 14 at 12.59.02 PM

After If You Put the Correct Fingerprint

Screenshot 2023 06 14 at 12.59.20 PM

Android Mobile App Link



This project provides an innovative and secure solution for controlling access to your door. By leveraging the power of biometrics and wireless communication, you can enhance the security of your premises while enjoying the convenience of a keyless entry system.

Arduino Based Projects


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