Concepção de um sistema de controle de acesso de um cofre com implementação de uma senha de alarme silencioso

Abstract

This work describes the design and implementation of an electronic access control system for safes, aiming at enhanced security and intelligent functionality. The developed solu tion combines advanced authentication technologies, such as biometrics and password, with an innovative panic password mechanism. This feature allows the safe to be opened under coercion situations while simultaneously triggering a silent alarm and sending dis creet notifications through the MQTT protocol. For the hardware assembly, components such as the ESP32 microcontroller, ESP32-CAM, LCD displays, fingerprint biometric sen sor, matrix keypad, solenoid lock, and a relay were used, all integrated into the prototype design. The access control logic was implemented through programming in a C++-based language(Arduino Sketch). Forcommunication, IoTintegration wasconfigured usingboth MQTT and HTTPprotocols, where microcontrollers and the smartphone acted as clients, enabling alarm activation on mobile devices via the MQTT Alert application. In addition, an Administrative Panel was developed and hosted on a local server with XAMPP, allowing access monitoring, password management, and log visualization. The methodology inclu ded rigorous stages of research, simulation, and practical testing, ensuring the robustness of the prototype. During the trials, both the system’s user authentication capacity and its effective response in emergency situations were validated, including the transmission of alerts and images to the relevant authorities. The results demonstrate the potential of this approach to enhance the security of critical environments, providing discreet and efficient protection against coercion risks or unauthorized access attempts.