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Service device for automatic sanitary equipment
Kudláček, Martin ; Levek, Vladimír (referee) ; Šteffan, Pavel (advisor)
The aim of this thesis is to inform readers about the basic principle of electronics for which the service module for the automatic sanitary technique will be designed, as well as design and describe the most important parts of the module theoretically. Likewise, the thesis deals with the most common mistakes in the design of printed circuits boards with respect to the resistance of the resulting device against interference. The implementation itself includes both module design and a communication algorithm for connecting multiple service modules and their remote control using the Raspberry Pi minicomputer. The thesis also contains a design of algorithm for verification of data transmission by the transmission system.
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Precise LED lamps dimming for stage technology
Šojdr, Marek ; Šteffan, Pavel (referee) ; Levek, Vladimír (advisor)
This bachelor´s thesis discusses the problems of dimming of LED bulbs using DC voltage. It explains basic converters topologies and power factor correction options. Part of the thesis deals with the subharmonic oscillation and possibilities of its elimination. Describes the design of the circuitry of dimmer module for precise dimming of selected types of LED bulbs, revival and testing of the dimmer module. Part of the work is basic for realization of the dimmer (printed circuit board, list of components).
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Speleological flashlight
Kaderka, Jakub ; Šteffan, Pavel (referee) ; Levek, Vladimír (advisor)
Existing speleology headlamps are discussed and several improvement are proposed in the beginning of the thesis. A switched hystersis buck LED driver is designed. Part selection process is mentioned with focus on driver efficiency. Li-Ion charger and battery protection circuit is discussed. Final part of the thesis describes construction of working lamp prototype and measurements of its characteristics. The LED driver reaches efficiency of 96 %, the maximal luminous flux is 869 lumens. The automated light regulation based on measuring amount of reflected light was found to be inefficient in a muddy underground.
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A Touch Sensor on the Glass Plate with a Backlit Pictogram
Jánešová, Daniela ; Levek, Vladimír (referee) ; Šťáva, Martin (advisor)
This thesis describes the solution of controlling device by capacitive-touch sensor. The geometry of the sensor is solved on standard printed circuit board, which is placed on the glass-made panel. In general, the theme of touch sensors is solved in the world by several companies and it is based on capacitive principles. They are described at the beginning of the work. By far, the main part of the work is focused on specific solutions with chosen integrated circuit for evaluation of touch sensor.
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Electronic attendance system
Valent, Adam ; Levek, Vladimír (referee) ; Šandera, Josef (advisor)
The goal of the bachelor thesis “Electronic Attendance System” is create a full-featured interactive and modern attendance system with web page, server and database. Employees will be able to create attendance records by attaching the RFID chip to hardware part of an attendance system. Database records will be possible to browse, edit end export to a CSV file.
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The battery charger module for GSM security system
Predný, Patrik ; Levek, Vladimír (referee) ; Čožík, Ondřej (advisor)
This bachelor thesis focuses on the design of universal module of charger for lithium battery that is constructed for the GSM device from ELEDUS company, placed in inaccessible, or difficult to access terrain. The solar energy will be used for battery charging and ensuring the GSM module power supply. The module dimensions are as small as possible for maintaining the compactness and the design focuses on the maximum resource utilization.
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Low-power Security System of the Electricity-free Cellars
Klimeš, Martin ; Levek, Vladimír (referee) ; Šťáva, Martin (advisor)
The work deals with the available options of security devices for basements, design and implementation of its own security equipment. An FPGA chip from Xilinx was used as a device control. The device also contains a GSM module for sending information via SMS about space violation. Intrusion signaling can also be signaled by a siren. Intrusion detection is performed using a door and motion sensor. The whole device is powered by a battery, but there is also the possibility of mains power.
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Control system for racing pneumatic monopost
Kaderka, Jakub ; Novák, Lukáš (referee) ; Levek, Vladimír (advisor)
The thesis is focused on developing a control system for a students project of racing car Falcon with pneumatic propulsion system. The electronic design was splitted into 4 standalone modules to increase reliability and mainain- ablitity of the system. The modules are engine control unit, power supply, human machine interface and speedometer. A CAN bus with customly designed communication protocol is used to interconnect these modules. Except the pneumatic circuit control the elekctronics takes care also about measuring the race related data (pressures in the pneumatic circuit, car speed, etc.). These values are stored on SD card and optionally sent over a wireless link to PC. In the second part of the thesis design of the firmware is described. For the debugging purposes a logging system was developed. The log messages from all modules are sent over CAN and stored on the SD card for post-mortem analysis. Unit tests were written for all elementary software blocks. The Falcon vehicle with this control system participated in the competition organised by the Hungarian company Aventics during May 2019. The Falcon ended on 8th place in long distance race and on 7th place in arcade race.
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Multipurpose bicycle alarm
Albert, Matej ; Novotný, Radovan (referee) ; Levek, Vladimír (advisor)
This diploma project is about designing a concept of an anti-theft tracking device for a bicycle. The device is equipped with a GNSS module for tracking of current location, GSM module for sending the location data in case of a theft and a BT module for user settings via mobile phone. The bike theft detection is detected by an accelerometer. The final goal of this project is a concept of such a device for evaluation and improvement purposes.
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Desing and implementation of the LCC converter application for emulation validating of the integrated LLC converters
Pokorný, Ondřej ; Levek, Vladimír (referee) ; Prokop, Roman (advisor)
This bachelor’s thesis deals with the design of an LLC converter, which will be used for the verification of prototypes of integrated circuit designs, as well as its applications. First, we address why we chose the LLC converter specifically for this application. We continue by analysing the specific type of converter and describe its function. The main point of this thesis is the numerical design with input parameters, which concludes with a simulation which verifies the calculated values. The product of the thesis is the design of the final wiring diagram of the LLC converter and the test board (module) and their realisation on PCB. The thesis concludes with a verification of the whole construction using a test board in a practical measurement. The work includes the author’s own design of a transformer, as well as a discussion on the problematics of the usage of magnetic circuits for LLC converters.
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