Implementation Of The Esp-Now Wireless Protocol And Lvgl Interface In An Esp32-Based Distributed Monitoring And Control System For Radiation Portal Monitors

Abstract

Radiation monitoring portals require a control system capable of performing real-time monitoring and operation while providing a flexible and scalable architecture. This study aims to implement the ESP-NOW wireless communication protocol and the Light and Versatile Graphics Library (LVGL) graphical user interface in an ESP32-based distributed control system for a radiation monitoring portal. The system consists of one ESP32 as the master node responsible for system control and user interface, and two ESP32 slave nodes for sensor data acquisition and actuator control. Communication between nodes is established using ESP-NOW without requiring an access point, while the graphical interface is developed using LVGL to provide real-time monitoring and touchscreen-based control. The implementation results demonstrate that ESP-NOW enables stable communication among distributed nodes, while the LVGL interface successfully displays system parameters and executes control commands according to operator inputs. Functional testing confirms that all major system features, including wireless communication, sensor monitoring, interface updates, and actuator control, operate as designed. Therefore, the integration of ESP-NOW and LVGL provides a simple, responsive, and scalable distributed control system suitable for embedded radiation monitoring portal applications.