This thesis describes the development of a system for accurate measuring volume of water in the reservoirs of fire vehicles. The basic idea is to capture the parallel and transverse inclinations of the reservoir to the vehicle trajectory from the horizontal axis and the water level height. The data are used in the calculations of the remaining volume of water in the reservoir. The goal of the project was to design an microcontroller based system that use sensors to capture and convert the pressure and inclination data and present calculated data on the graphic display. The first part describes the measurement of water level height. Described are characteristics, advantages and disadvantages of each measurement principle and its use as part of an electronic system. The second part is describes the analysis of system architecture. It presents the components, sub‐systems, and some of their properties. This section also presents the system signals, their characteristics and adjustments which are required to reduce signal interference. The third part presents the principle for calculation the volume using a mathematical principle of determining the rotation of points and the plains area in three dimension space. Last part describes the structure of the program running on the microcontroller. It specifies the structure that is able to operate on the principle of multi‐tasking and processing data in real time. Scheme and designed printed circuit board drawing of the system are located in the appendix.
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