<![CDATA[The microclimate inside a greenhouse, especially temperature and humidity, must be monitored continuously to maintain conditions that support optimal plant growth. However, manual monitoring is often time-consuming, susceptible to human error, and can cause delays in decision-making. To address these issues, this study developed an Internet of Things (IoT)-based monitoring system using an ESP32 microcontroller and a DHT22 sensor. The DHT22 measures temperature and relative humidity, and the ESP32 processes the readings and sends them through a Wi‑Fi connection. The data are then visualized in real time on a Blynk dashboard accessible via a smartphone, enabling remote observation of environmental changes without requiring physical presence in the greenhouse. System testing was performed in a simulated greenhouse environment to evaluate sensor reading behavior, communication reliability, system stability, and the continuity of data updates. The results indicated that the dashboard refreshed automatically with an average delay of about 1 to 3 seconds. Overall, the proposed ESP32-based solution is simple, low-cost, and practical for greenhouse microclimate monitoring. It can serve as a foundation for further development toward automated monitoring and control by adding more sensors, improving data processing, and integrating control actuators.]]>
