Welcome to VLock+, a personal home automation project designed, developed, and deployed by Aniket Chowdhury (Hashtag).
This project automates door locking/unlocking using a servo-controlled mechanism with multiple control options, including buttons and a remote keypad system, and includes advanced features like passcode entry, LCD display, and fault safety handling.
VLock+ is a smart door lock system that allows secure access using:
- Keypad passcode entry with secret admin features.
- Manual override buttons.
- Door handle button for unlocking.
- An LCD for visual interface and interaction.
- Safety features including manual reset and retry mechanism if door fails to close.
- Permanent Passcode Storage — passcode is saved in EEPROM and persists even after power loss.
- Self-initializing EEPROM — first boot automatically stores default passcode if EEPROM is blank.
The project is installed in my personal room and is built with modular expansion in mind, with a secondary Nano board handling keypad input over serial.
- 🔒 Secure Lock/Unlock using 6-digit Passcode
- ♻ Passcode Change Mode with Secret Admin Code
- 💾 EEPROM Passcode Storage — saves any changed passcode permanently until updated again
- 🛡 Automatic EEPROM Initialization with default passcode on first boot
- 💡 Backlight Toggle on LCD via Keypad
- 🆘 Manual Reset Button (hidden for safety)
- 🎛️ Multi-Button Unlock from different positions
- 🚪 Servo-controlled Door Mechanism
- 🔁 Auto Retry if door fails to close properly
- 🔄 Soft Restart functionality via keypad
- 🔊 Buzzer Feedback for all actions and alerts
- 🔐 Relay Trigger (Solenoid) Control for enhanced locking
- 🧠 Smart UI Timeout and Override Logic
| Component | Description |
|---|---|
| Arduino UNO | Main controller board |
| Arduino Nano | Secondary board (keypad input via Serial) |
| 20x4 I2C LCD | Display for passcode UI and system feedback |
| Servo Motor | Controls door lock mechanism |
| Buzzer | Audio feedback |
| Relay Module | Controls solenoid or magnetic lock |
| Keypad (4x4) | External keypad for passcode entry |
| Buttons | Multiple buttons for manual unlock |
| Hinge Switch (BTN) | Safety sensor to confirm door closure |
| LEDs (Red/Green/Blue) | Status indicators |
| EEPROM | Non-volatile memory to store passcode |
- Main Passcode:
123456(stored in EEPROM after first boot) - Change Passcode Code:
#1234#
setup(): Initializes all hardware components, loads passcode from EEPROM (or sets default on first boot), and starts UI.loop(): Main execution loop to listen for keypad input and button presses.keypad(): Handles all key inputs and UI logic.unlocking(): Validates passcode and handles passcode change flow.door_open()/door_close(): Controls servo and relay for door operations.CheckDoorSafety(): Ensures door is physically closed and retries if not.keygen(): Receives keypad input via SoftwareSerial from Nano.debounceButton(): Safe button press handler with long press detection.homescreen()/startup(): Display UI management.warningBuzz()/RestartBuzz(): Buzzer alerts for feedback.loadOrInitPasscode(): Loads saved passcode from EEPROM, or initializes it with default on first boot.savePasscodeToEEPROM(): Updates stored passcode without overwriting unchanged data.
| Key | Action |
|---|---|
| A | Lock the door |
| B | Unlock (asks for passcode) |
| C | Toggle LCD backlight |
| D | Restart system (only when open) |
| #1234# | Initiate passcode change mode |
- EEPROM corruption prevention — passcode updates use
EEPROM.update()to avoid unnecessary wear. - Manual Reset Button is hidden behind door panel.
- Retry Mechanism: If the hinge switch doesn’t confirm door closure, the system retries up to 3 times.
- Timeout: UI auto-closes passcode input after 60 seconds.
- Override: Unlock button can bypass passcode in emergencies.
- Upload this code to Arduino UNO.
- Upload Nano Keypad Code to your Nano board.
- Wire the Nano to UNO via SoftwareSerial (Nano TX → UNO RX D2).
- Connect components as per the pin definitions in the code.
- On first boot, the default passcode will be automatically saved to EEPROM.
- Power up and observe startup melody + door auto-unlock on boot.
- Use keypad to lock/unlock and test passcode change — new codes are stored permanently in EEPROM.
👨 Name: Aniket Chowdhury (aka Hashtag)
📧 Email: micro.aniket@gmail.com
💼 LinkedIn: itzz-hashtag
🐙 GitHub: itzzhashtag
📸 Instagram: @itzz_hashtag
This project is released under a Modified MIT License. It is intended for personal and non-commercial use only.
🚫 Commercial use or distribution for profit is not permitted without prior written permission. 🤝 For collaboration, reuse, or licensing inquiries, please contact the author.
📄 View Full License
This is a solo passion project, built with countless nights of tinkering, testing, and debugging.
If you find it useful or inspiring, feel free to ⭐ the repository or connect with me on social media!
“If the mind can create, the hands can translate.” – Hashtag