National Repository of Grey Literature 153 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
The Precise Measurement of Magnetic Azimuth
Junasová, Veronika ; Levek, Vladimír ; Šteffan, Pavel
This article deals with measuring magnetic azimuthusing inertial sensors. It introduces the steps in this process andobstacles that need to be solved in order to achieve more preciseresults. The magnetic azimuth can be determined using onemagnetometer; however, the precision in such measurement islimited. Therefore, this article also introduces measurement ofrelative azimuth acquired by the gyroscope. The essential part ofprecise measurement is the calibration of the mentioned inertialsensors, which is described in detail. The process of calibration issupported with equations, graphs, and tables. The measurementitself consists of an output from the magnetometer. The relativeazimuth acquired from the gyroscope is then combined using acomplementary digital filter with magnetic azimuth from moreaccurate magnetometer. The final results show the improvementobtained with the presented method. The article also containsinformation on a compact device designed for simple calibrationand measurement with the mentioned sensors.
Door security system
Drugda, Andrej Marián ; Junasová, Veronika (referee) ; Šteffan, Pavel (advisor)
This bachelor thesis deals with the design of a door security system supporting entry using a numeric password, RFID card reader and also using fingerprint biometric authentication. The whole project is situated as a demonstration of various methods of security identity verification. The main part is a material model of the door, which is intended to provide visual and clear information about the possibilities of security systems. In addition to safety elements, the work also describes the selection and parameters of the microcontroller on which the entire system is based.The work also contains essentials such as a description of the system's functionality, a display of block diagrams, hardware and software equipment, or step-by-step implementation of the project.
Mains charger with variable output voltage.
Dittrich, Marek ; Šteffan, Pavel (referee) ; Boušek, Jaroslav (advisor)
Nowadays every portable electronic device, tool or machine is powered by some type of accumulator. It is not possible to standardize types because the use of batteries is influenced by the power output, capacity, weight or price. They also differ in charging voltage, depending on their chemical composition. For this reason, it is often necessary for each type to have its own charger. In this case, an attempt has been made to simplify charging and reduce charger procurement expenses by designing a charger with adjustable voltage from 2.6 V to 20 V. This range can cover the charging of most types of accumulators available on the market.
Blood pressure monitor
Kučera, Michal ; Háze, Jiří (referee) ; Šteffan, Pavel (advisor)
This thesis deals with the design and realization of a prototype of non-invasive blood pressure monitor based on the principle of Korotkoff sound detection. The design compares this method of measuring blood pressure with other methods. This design of an automated measuring system, which is controlled by a microprocessor, utilizes the scanning of Korotkoff sounds with an electret microphone placed in the cuff. The microphone signal is then amplified, filtered and adjusted for evaluation. The prototype uses processor-controlled inflation by the compressor and deflation of the cuff by a valve that is open without applied voltage.
Universal module for supporting team games
Zemanová, Renata ; Junasová, Veronika (referee) ; Šteffan, Pavel (advisor)
The goal of this diploma thesis is to design electronic device called Universal module, which serves as an assistant for outdoor games. The design focuses on safety, simplicity and low cost. Due to the outdoor use, water resistance is also addressed. This thesis deals with selection and design of the electronics. Emphasis is given on the selection of light signaling, of the wireless module, power supply and microcontroller. The PCB design was carried out on 2 connected boards. Firmware was created for simplified programming of the Universal module and demonstration modes were also created for different activities.
Solar charger
Šálek, Karel ; Šteffan, Pavel (referee) ; Levek, Vladimír (advisor)
The thesis deals with the design of a solar charger with the possibility of energy backup. First, the basic principles of operation of photovoltaic panels, batteries and DC-DC converters are described. Subsequently, the topology of the charger and the analysis of the individual blocks is proposed. In the last part, the implementation and measurement of the basic parameters of the device is carried out.
Ultrasonic flow measurement
Mikan, Lukáš ; Boušek, Jaroslav (referee) ; Šteffan, Pavel (advisor)
Práce se zabývá ultrazvukovými plynoměry, které představují velmi zajímavou alternativu ke konvenčním mechanickým měřidlům. V první části je vysvětlena problematika měření plynu obecně, jsou prezentovány hlavní typy běžně používaných plynoměrů a pozice ultrazvuku mezi konkurujícími si přístupy. Následuje úvod do ultrazvukového měření v kontextu plynoměrů. Práce se specificky věnuje metodě Transit Time, což je nejpopulárnější ultrazvuková metoda využívající měření času průletu akustického signálu pro stanovení rychlosti plynného média v potrubí. Ve druhé části je implementován jednoduchý model ultrazvukového plynoměru se třemi ultrazvukovými kanály. Tento model dokáže měřit rychlost, průtok a proteklý objem plynu. Model také emuluje pulzní výstup používaný v plynárenství pro komunikaci akumulovaného objemu. Technické řešení je založeno na čipu AS6040, což je dedikovaná SoC pro ultrazvukové plynoměry typu Transit Time. Jsou zde prezentovány funkce AS6040, algoritmické řízení celého měřicího systému a klíčové problémy, které bylo nutné během vývoje vyřešit. Model byl poté testován na dýzové zkušebně plynoměrů. Třetí část práce se věnuje analýze získaných dat.
Automotive LED driver with additional functions
Vlach, Marek ; Duz, Aleksei (referee) ; Šteffan, Pavel (advisor)
In this diploma thesis, the design and construction of a LED driver with additional functions for the automotive industry is carried out to meet its requirements. The LED driver is based on the principle of DC/DC converter in H-bridge topology, which is used to supply a string of power LEDs. The combined function of the daytime running lights and position lights governed by the driver control electronics is then implemented on the LED string. Other additional functions of the driver are temperature regulation of the output current and error reporting in case of a fault condition on the LED string. A set of typical measurements on a manufactured sample including functional tests, efficiency measurements, thermal analysis and EMC testing are employed to verify the driver parameters.
Motor inverter for Formula Student
Macko, Maroš ; Tomíček, Pavel (referee) ; Šteffan, Pavel (advisor)
This thesis is focused on a power inverter for traction motors for a Formula Student car. Part of the work involves the design and implementation of this system. The main high-voltage power board design and the selection of suitable components are described. Furthermore, a secondary board is designed, which is used for communication and diagnostic measurements. All systems must comply with the rules of the Formula Student competition.
Wireless communicator for boat sport
Kubovičová, Lucia ; Šteffan, Pavel (referee) ; Levek, Vladimír (advisor)
The work deals with technologies related to wireless signal transmission, Bluetooth technology and the design of a device that is used to distribute helmsman's commands on a rowing boat. The device consists of two parts that communicate with each other using Bluetooth technology. Thus, both parts of the device have a Bluetooth module that works in both parts in different modes. The control of the device pairing process is provided by a microcontroller. There are buttons used for external communication and LEDs for signalization.

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