Password Based Door Lock
Developed a password-protected door lock system as part of my university IoT project in the 5th semester. The system used an Arduino Uno microcontroller to control a stepper motor for locking and unlocking the door based on the correct password entered through a keypad interface. This project demonstrated fundamental concepts of embedded systems, sensor interfacing, and microcontroller programming in a real-world IoT context.
View Live Project.png&w=3840&q=75 "Password Based Door Lock preview")
About the Project
Built a password-protected electronic door lock system as part of my university IoT coursework, demonstrating applied embedded systems development with physical hardware integration.
My approach was to design the full system from circuit schematic to working prototype — selecting an Arduino Uno as the microcontroller for its accessible GPIO pins and C++ programmability. The door mechanism was controlled by a stepper motor, chosen over a servo for its precise positional control, which allowed reliable locking and unlocking without sensor drift.
The user interface was a matrix keypad where occupants enter a predefined password. The logic I implemented included password validation, a lockout mechanism after repeated incorrect attempts, and an LED indicator system to provide clear feedback on lock state. All control logic was written in C++ running directly on the Arduino.
This project gave me hands-on experience with hardware-software integration, real-time event handling in embedded environments, and the constraints of programming within limited memory and processing resources — foundational skills I later applied to more complex IoT and sensor-based projects.