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USB miltimeter with microprocessor
Samek, Martin ; Kolka, Zdeněk (referee) ; Kovář, Jan (advisor)
Topic of my terminal labour is a proposion of multimeter and its resulting connection by the help of bus USB. When proposing the multimeter there was a tendency to use a minimal number of component parts to conserve a good protection against a bad usage in application. The most widespread busbar USB is used for connection of the multimeter and a computer. Standard HID is used for communication, for that it is not neccessary to install any system drivers.
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Meter of powerline quality
Samek, Martin ; Horský, Pavel (referee) ; Kolka, Zdeněk (advisor)
The subject of graduation thesis is a design of line analyser according to standard EN61000-4-30 class A. The analyser is determine to be used for quality control of supplied electric power which is, during electric power transmission, affected by several disturbances. Power line analyser should measure single-phase and three-phase network parameters in LV and HV systems. Measured parameters can be shown on the full colour TFT display, stored in the device memory or sent to other devices such as PC. For communication between the device and PC the USB, Ethernet or RS485 interface are used.
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Electronic notice board LCD
Chmelař, Petr ; Franek, Lešek (referee) ; Bradáč, Zdeněk (advisor)
This paper focuse at market research with digital signages, kiosks, and the subsequent suggestion directed on the concept of the new system and its hardware parts and software. The aim of this work is grounded on creating the concept of electronic boards, which is derived from the market research. The concept of the system is describing the principle of functioning of the digital signage, possibilities of controlling and system administration itself. The suggestion of the hardware part of the system contains the selection of appropriate mechanism for realization of the software part of the system and the proposal of controlling and signaling aspects, which are suitable for communication with users.
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Design efective power speed controller for 3-phase motor
Uchytil, Filip ; Hanák, Pavel (referee) ; Lattenberg, Ivo (advisor)
This paper deals with the regulation of revolution of the asynchronous three phase engine with the frequency transformer. Firstly we will look into individual types of engines, the ways of regulation of the engines, the measuring of contemporary voltage and current at the engine and programming the ATMEGA64 microprocessor. The supervision is beeing handled by the PWM signal, which ensures low consumption of our circuit. The outputting part is comprised by the MOSFET transistors. The thesis devotes to communication of the ATMEGA64 processor via the USB port. The transmission ratio, voltage and even the contemporary current is displayed on the LCD monitor. The outcome of this thesis is the effective regulation of the asynchronous three phase engine, with the possibility of tracking all of the parameters mentioned above which are shown on the LCD display.
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Measuring and recordes electrical electrical quantities
Vít, Tomáš ; Čejka, Miloslav (referee) ; Havlíková, Marie (advisor)
The aim of this Bachelor's thesis is the design and realisation of a device able to measure and record electrical quantities - voltage, current and resistance. The part of design is a theoretical description of measurement methods with the selection of suitable components. Based on these components is designed hardware design of the device, followed by its practical assembly. The final device is able to be measured electric variables at centain intervals, which are then stored on the SD card. The final element is the CSV file containing the measured data and time of each measurement.
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Smart plug with consumption measurement
Hudák, Filip ; Mišurec, Jiří (referee) ; Lattenberg, Ivo (advisor)
The master thesis is devoted to the design with the following implementation and realisation of the smart socket. The theoretical part discusses already existing solutions on~the market and familiarizes with the methods of measuring the power of electricity, which are used later in the thesis. The next part of the design of the smart socket, the thesis deals with it's own design of the smart socket and the analysis of individual components, from the microprocessor, analog-to-digital converter to the individual components that measure voltage and current. The last part of the thesis involves in the realization of~a~schematic design, the production of printed circuit boards where the circuit boards are divided into two parts, the part with alternating current and the part with direct current. Last but not least, there is a program part that includes the main program for the ESP32 microcontroller and an Android application which displays measured and calculated values, with the possibility of controlling the smart socket wirelessly. The final solution to the given problem is a device that measures voltage and current and displays the results to the user via a web application and an Android application. It will mainly be used in places where it is not possible to offer socket management via the cloud.
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Passive Balancer For Eight Cell Battery Lifepo4 Pack
Herceg, Erik
This Article deals with the passive balancer that is required in all multi-cell battery systems. The balancer is designed for eight LiFePo4 battery cells that are connected in series, to achieve the required voltage of about 28 V. Each cell has a capacity of about 9600 mAh, resulting in a 80 Ah battery back. The balance algorithm is performed by main STM32 microcontroller (MCU), which controls eight balancing transistors. For measuring battery cell voltages, there are two variants of cell measurement. The first alternative of cell measurement is a battery monitor IC, which is also capable of low side current measurement and as protection it also drives the low side current transistor switch, which protects powered device. Other options are measurement by 14-bit analog to digital converter (ADC) or with internal ADC of MCU. The balancer circuit also includes an RS485 interface for communication with other devices.
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Measuring and recordes electrical electrical quantities
Vít, Tomáš ; Čejka, Miloslav (referee) ; Havlíková, Marie (advisor)
The aim of this Bachelor's thesis is the design and realisation of a device able to measure and record electrical quantities - voltage, current and resistance. The part of design is a theoretical description of measurement methods with the selection of suitable components. Based on these components is designed hardware design of the device, followed by its practical assembly. The final device is able to be measured electric variables at centain intervals, which are then stored on the SD card. The final element is the CSV file containing the measured data and time of each measurement.
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