In this thesis, I present some possibilities offered by the Internet, in the development of communications network. In particular, I was interested in the development of IoT (Internet Of Things) networks that connect physical objects with built-in latest technology. These objects can be buildings, cars, smart homes or entire smart cities. They communicate with each other and exchange information in a manner that allows for cost-effectiveness, safety and energy saving . Experts estimate that in this decade, the number of objects connected to the network IoT will reach tens of billions. In the introduction, I described the key points for design of protocols for the control of smart buildings. I introduced addressing modes, energy-saving and connections of devices in the IoT group. Special emphasis in the theoretical part of the diploma, I devoted to the latest wireless communication technology Lora. This network, which has been successfully operating in some European countries (the Netherlands), is characterized by very low energy consumption and long-range, high degree of privacy and security, and high-capacity data transmission. I have described ways of communication between devices of different classes, intended for different types of applications and presented the basic types Lora Protocol. An integral part of the theoretical diploma is a description of some of the other technologies that are widespread and well accepted and become indispensable in automation systems of smart buildings. In details are presented architectures of ZigBee and Z Wave protocol and the format and ZigBee communication message. In the practical part of the thesis I show a model which illustrates irrigation system for a small garden. The garden is located approximately 30 m from the main controller, which is located in the house. The system is operated by two solenoid valve through which water is supplied to the area of the garden with the different requirements of irrigation. The entire system consists of: water source, pump, two solenoid valves, measuring soil moisture, water dispensers and pipe system. Wireless control system works via interfaces and the main controller on the transmitting side (RaspberryPi). The main controller is connected to the LAN network, sending commands to the microcontroller (Arduino) on the receiving side, that on the basis of the received commands and the sensor operates with a valve. Communication between controllers runs between Xbee modules via the Zigbee network. The system also allows for obtaining weather forecasts via the main controller, which can be used for determining the regime watering the garden. An integral part of the system is also a moisture sensor, which is installed on a part of the garden, where plants are sensitive to the lack of moisture in the soil. The described system also effectively contribute to water saving, and is easy to manage remotely. It can also be used as a basic building block for expansion to larger and more complex irrigation area.
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