By entering a new industrial revolution with the implementation of 5G technology and the development of existing devices and technologies, the range of opportunities and needs of the market is expanding. The coming time gives us the opportunity to choose the direction in which we will develop. The development of materials and technology so far has brought us to the moment where the modules for device development are very affordable. The paper presents the implementation of flood sensors and sensor communication using the Wi-Fi protocol, which is currently the most widespread protocol for device communication via the Internet. Although there are a large number of different protocols used in the IoT industry, which work at lower frequencies than the Wi-Fi protocol, the best solution for the future is currently being considered, and for this reason, new technologies are being developed, such as Matter, which nevertheless chose the same frequency as well as Wi-Fi. The goal of this work was to create a flood sensor, which is a practical example of a smart home device. The flood sensor belongs to the category of safety devices, because it serves to prevent floods or other possible undesirable events by following the display of data from the sensor. The paper also explains communication via the Wi-Fi protocol and an example of connecting a flood sensor to a mobile and web application for the purpose of continuous tracking information from sensors. The multi-functionality of the sensor can be expanded by adding more water sensor modules, and this paper presents a simple prototype solution for the purpose of presenting the basic functionalities of the flood sensor.