The Internet of Things (IoT) is increasingly recognized as a foundational pillar of digital transformation, with applications spanning industry, agriculture, and education. In education, the demand for smart classrooms that monitor and control the learning environment while optimizing energy use and operating costs has become imperative. This paper presents a smart classroom management solution based on LoRaWAN communications, leveraging its long-range connectivity, low cost, and low power consumption. The system employs an STM32 microcontroller as the central controller, integrating temperature-humidity sensors, occupancy sensors, and current-voltage sensors to acquire environmental data and electrical status. Collected data are transmitted to a server and visualized in a management application developed by the authors, enabling real-time monitoring and remote actuation (e.g., switching lighting and heating, ventilation, and air conditioning (HVAC) on/off). A hardware-software prototype was built and piloted in a simulated classroom. Preliminary results demonstrate stable operation, feasibility, scalability, and strong potential for practical deployment in smart educational environments.