Smart Door Lock System Using Arduino Uno

Abstract

The demand for affordable and customizable security systems continues to grow as embedded microcontrollers become more accessible. This study explores the development of a Smart Door Lock System using Arduino Uno, implemented entirely in Tinkercad’s block-based programming environment. The system integrates a potentiometer acting as an analog password input, a 16×2 LCD for real-time feedback, an LED indicator for status signaling, and a servo motor as the primary locking mechanism. Results from three test scenarios̶valid input, invalid input, and user inactivity̶demonstrated consistent and accurate system performance. Findings highlight the educational value of analog-to-digital processing and conditional logic for early embedded systems learning, while identifying limitations and opportunities for future enhancement.