This research aims to develop a prototype indoor navigation system using QR codes as an access medium. Users can scan QR codes placed at various points in the building to access the indoor map and select their desired destination. The system processes the current position and the target point to provide real-time navigation. The prototype was developed as a web application adaptable to different devices, with a database for storing building maps and location coordinates. The main advantages of the system are its low cost, ease of use, and applicability to a wide range of users without requiring additional hardware.
         The field experiment with 50 participants demonstrated that the system achieved a navigation accuracy of 97.6% and reduced the average route-finding time by 28.3% (from 148 seconds to 86 seconds). Most users expressed high satisfaction with the system’s convenience and simplicity. The system can be applied in large-scale buildings such as hospitals, universities, and shopping centers.
          For future development, the system could be integrated with advanced technologies such as Augmented Reality (AR) navigation, voice guidance for visually impaired users, and real-time database connectivity to enhance user experience and meet the requirements of smart building environments.