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Speech switch for APD system
Hartmann, Lukáš ; Götthans, Tomáš (referee) ; Frýza, Tomáš (advisor)
This work describes design device that is used to connect voice speech lines in underground mines for APD system. Using the device, you can connect up to 60 speech lines up to sixteen independent communication group (circles). Each communication circle can be listen in by the operator, or he can initiate call from control board. Switching of individual lines is controlled using the utility on the computer that communicate with this device via serial port RS-485.
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Design of class-D audio power amplifier
Fiala, Roman ; Götthans, Tomáš (referee) ; Brančík, Lubomír (advisor)
This semestral thesis describes class D low frequency power amplifiers and design of specific 2x100W class D power amplifier. The designed amplifier contains a second order sigma-delta modulator in which the quantization is controlled only by the delay of modulator components. This design does not include the clock generator which usually controls the quantization in sigma-delta modulators. This semestral thesis also includes design of a switched-mode power supply for the power amplifier and for the preamplifier. The PSpice program has been used for the design and verification of some sections of circuits. All designs have been built. Also basic parameters of completed circuits were measured.
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Backup power supply with solar panel charging
Křepela, Pavel ; Götthans, Tomáš (referee) ; Kubíček, Michal (advisor)
This project aims to create a backup power source with solar charging for small mobile devices (through USB connector). The charger should store power in a battery that is charged either from external power source or the solar panel. In the introduction, the work deals with the theory of solar cells and batteries. Furthermore, it described the selection of suitable components and design diagram.
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Camera slider control
Rajnoch, David ; Götthans, Tomáš (referee) ; Mego, Roman (advisor)
This bachelor thesis describes design and implementation of stepper motor digital controller that manages camera slide movement. The main elements are microcontroller ATmega16 and stepper motor driver TOSHIBA TB6560. Controller allows a time-lapse mode and continuous linear movement including smooth start and stop. Human interaction is based on joystick input and text display connected via HD44780 interface. The theoretical part describes stepper motors and their control modes. The practical part deals with design of electronic circuit and test of functionality.
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Automatic temperature logger
Spielmann, Ondřej ; Petržela, Jiří (referee) ; Götthans, Tomáš (advisor)
The subject of this bachelor’s thesis is introduction with the principles of measurement in meteorology. Using this knowledge it’s designed automatic temperature logger with wireless sensors. The acquired data is displayed on the display and further processed. Thesis also deals with the system software.
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Laboratory power supply
Říha, Pavel ; Petržela, Jiří (referee) ; Götthans, Tomáš (advisor)
This bachelor's thesis deals with design, simulation and realization of a prototype of regulated laboratory power supply with adjustable current protection by potentiometers with measuring and displaying the output voltage and current using a microprocessor and LCD display with adjustable voltage range of 0 - 30V and current 0-3A. The thesis also includes design of power transistor cooling and the results of testing functional prototype.
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Embedded system design
Gábor, Tomáš ; Galetka, Josef (referee) ; Götthans, Tomáš (advisor)
This work deals with application of ARM based development board as platform for remote controlling of attached peripherals. It describes practical experiences with A20- OLinuXino-Micro-4GB development board and it’s available options. Used hardware and testing peripherals are described in the next part along with programming of the software for web interface and for communication in between development board and peripherals. The second half of this document describes design process of own embedded system beginning with schematic, continuing with PCB wiring. Each step of PCB wiring process is described with required details in text, including crucial connections between processor and memory chips. The last part contains details about setting a calibration of memory chips and designing optional peripheral modules.
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Design and construction of weather station
Bílý, Stanislav ; Galetka, Josef (referee) ; Götthans, Tomáš (advisor)
This thesis is focused to design and implementation of wireless weather station. The first part deals with possibilities of measurement in meteorology. The next part of thesis includes the choice of suitable sensors and conception of device. The next part of thesis contains design of the schematic of outdoor station and control unit. The last chapter is focused to testing accuracy and measuring basic parameters of disigned conception.
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