Abstract
Internet of things (IoT) is increasingly widely applied in life. The article presents an IoT application for measuring and monitoring environmental parameters of temperature, humidity, gas concentration, motion detection and control of electrical equipment such as electric fans and lights. The components of the system, the algorithm flowchart and the system control interface are presented in detail. The connection to the system via the Internet for monitoring and control is done via the Blynk website on a computer or Blynk IoT on a smartphone. The system has been built and works reliably.