<![CDATA[Conventional door security systems have limitations regarding ease of access, security, and the modern user experience. Physical keys are prone to loss and duplication and do not support real-time access monitoring. The integration of the Internet of Things (IoT) and Augmented Reality (AR) in door security systems remains largely unexplored; consequently, the potential of these technologies has not been fully utilized in either daily life or office environments. This research designs and implements an IoT-based Smart Door Lock integrated with an Augmented Reality application. The technologies employed include a NodeMCU ESP8266 microcontroller, a 5V DC motor for door actuation, a solenoid lock mechanism, a relay module, an L298N motor driver, an LDR sensor paired with a 5V laser for indoor presence detection, a 16x2 LCD for system status display, and Firebase Realtime Database for communication between the AR application and the hardware. The research employs the Research and Development (R&D) method as defined by Sugiyono, comprising nine stages: identifying potential and problems, data collection, product design, design validation, design revision, product testing, product revision, usage testing, and production. Black Box Testing was conducted on all hardware components. Test results indicate that the system successfully connected to the internet in under 6 seconds using three different providers: Telkomsel, Axis, and Indihome. Data retrieval latency from Firebase was recorded at less than 3 seconds, the door opening/closing mechanism delay was under 5 seconds, and the LDR sensor response time was 1.68 seconds. All nine hardware test scenarios were validated. The system is capable of opening the door fully, partially, or automatically from the inside. It is concluded that the IoT and AR-based Smart Door Lock has been successfully developed and holds the potential to replace conventional door systems in office environments.]]>
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