The paper analyzes developments in the field of environmental parameter monitoring using microcontrollers and Internet of Things technologies, with results that justify the use of ESP8266 microcontroller. A monitoring system for microclimate parameters (temperature, humidity and atmospheric air pressure) in smart homes and industrial premises based on ESP8266 microcontroller has been developed, which demonstrated its effectiveness through a combination of hardware and software tools. The integration of BMP280 and AHT10 sensors ensured the accurate measurement of temperature, humidity and atmospheric air pressure. The asynchronous web server integrated into the ESP8266 allows for displaying the results as interactive, real-time graphs. In the developed system, users access data directly from the local network, ensuring functionality even without Internet access. Furthermore, the cost of the hardware (ESP8266 controller, BMP280 and AHT10 sensors) remains minimal, making the system accessible for widespread use. The implementation of a user notification system via WhatsApp Messenger using CallMeBot service became an important addition, allowing for the prompt notification of users about exceeding parameter limit values, even without logging into the web application. This approach increases the level of automation, convenience and reliability of microclimate control, making the system suitable for a wide range of tasks in domestic and industrial applications.
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