Spausdinimo įrenginys „CITIZEN MD-910“ naudojamas kasos aparatuose, kaip kliento ir kontrolinės juostų spausdintuvas. Šis spausdintuvas plačiai naudojamas šiuose kasos aparatuose: ELCOM EURO-2000M, CASIO FE-800, DATECS MP-500, KONIC SR508F. Šiuos spausdintuvus remontuojant kasos aparatuose, iškyla pavojus, panaikinti kasos aparato atmintį, kurioje saugomi programiniai ir apyvartų duomenys. Spausdinimo įrenginio „CITIZEN MD-910“ patikros stendas kuriamas, tam, kad palengvinti kasos aparatų remonto darbus, taip sumažinant tikimybę panaikinti remontuojamo kasos aparato atmintį. Darbo tikslas – išnagrinėti spausdinimo įrenginio „CITIZEN MD-910“ veikimo principą, elektrines bei mechanines charakteristikas. Taip pat, išsiaiškinti spausdintuvo dvigubos galvos adatų išsidėstymą, sukurti spausdinimo algoritmą, simbolių biblioteką ir valdymo programą. Spausdintuvas „CITIZEN MD-910“ bus dedamas į stendą ir pasiuntus į jį iš valdymo programos tekstą, tikrinamas jo veikimas. Stendas atitiks spausdintuvo realų darbinį režimą. Iš to, kaip vyks spausdinimas, ir iš atspausdinto teksto ant popieriaus juostos, bus sprendžiama apie spausdintuvo mechaninius ir elektronikos gedimus, adatų veikimą ir jų mušimo jėgą į popierių, bei tinkamumą tolesnei eksploatacijai. Spausdinimo įrenginio „CITIZEN MD-910“ patikros stendo pagrindinė kūrimo priežastis yra ta, jog nėra sukurtų panašių analogų, kurie palengvintų šių kasos aparatų spausdinimo įrenginių remonto darbus. / Dot impact printer mechanism “CITIZEN MD-910” is used in cash registers as a printer for customer receipts and journal paper ribbons. This printer is widely used in the cash registers such as ELCOM EURO-2000M, CASIO FE-800, DATECS MP-500, KONIC SR508F. Repairing these printers inside the cash registers there is a risk to delete the cash register’s memory in which programs and data of a turnover is stored. The dot impact printer mechanism “CITIZEN MD-910” test stand is being worked out to make the cash registers repairing easier and in this way to reduce the risk of deleting cash registers memory. The printer “CITIZEN MD-910” will be placed in the test stand and its work will be tested by sending text from the operating program into it. The stand will simulate real working conditions of the printer. Analyzing the printing process and the printed text on the paper ribbon it will be possible to decide on printer’s mechanical and electrical damage, work of wires and force they dot the paper, also, further usability. There are no similar analogues which could make the repairing of the cash registers dot impact printer mechanism “CITIZEN MD-910” easier and this is the main reason to work out the dot impact printer mechanism “CITIZEN MD-910” test stand.

This thesis deals with the design and implementation of a control system that complements the existing BS110 flip-dot display panel and enables Ethernet and wireless communication. It first briefly discusses the original use of the display, and gives an overview of the display types. This is followed by an analysis, testing and repair of the BS110 panel, followed by a description of the proposed concept and the development of the control computers and their circuitry. For these, the thesis further describes the design and implementation of the software consisting of a website, database, MCU control script and display circuit control program. Finally, the system so designed and built is demonstrated and evaluated.

This thesis is based on the design and production of teaching kits with expansion modules which are based on the Atmel AVR microcontroller. Kit consists of a plate containing processes and basic power modules directly on the board and expansion modules "SIMAČ". "SIMAČ" modules are virtual elements that simulate the real elements and they are commonly used in industrial automation. Because of their cost they are integrated in extension kit as programmable modules. It also contains basic theoretical information about working with ATMEL AVR microcontrollers. Expansion modules with module development board and disc which will be loaded all the schemes, programs and technical documentation for individual districts will be attached to the thesis.

This diploma project summarizes a theoretical introduction regarding the issue of traffic light control. Further there is industrial communication discussed, where they are the Ethernet / IP protocol and the Modbus TCP protocol described more in detail. The following is the description of the Logix series programmable controllers. Then the diploma follows up with market research in order to find the most suitable development kit which is used as a trial prototype. Then it is concerned with a development kit with a communication module from AND-TECH company. Software was developed on them, more specifically a library for processor ports, memory and the Modbus TCP protocol. After verifying the functionality of the software, the hardware design was started. From the first site it is development kit and module and from the second site there are input and output circuits. There must be the assessment of the results found during the test operation. The end of the document describes incorrect steps that were repaired in hardware.

This Master's thesis deals with design and a realisation of a device controlling an OLED display, Densitron DD-25664-1A. This display has a resolution of 256 x 64 pixels and allows displaying of 4-bit grayscale. The proposed utility software implements the initialization and termination functions, two sets of fonts { Latin and Greek letters and functions for rendering graphics and text. The result of the project is a device with the controlling software.

The aim of this master’s thesis is to design a device for identification of bus stops for blind people. In the beginning the work describes information about the RFID system, characterizes each part of this system, mutual communication of its components and evaluates possibilities of RFID communication frequency bands. Subsequently the work describes the block diagram of the device and the circuit scheme of each block. Work concentrates on a selection of circuit components for the RFID transceiver, the voice module, the control module and choose a suitable transponder to place it on metal constructions. Control programs are also described. PCB design of each board, partlists and source codes are in the appendices of this master’s thesis.

This diploma thesis deals with digital audio amplifier with universal inputs and its design. The first part describes modulation and audio formats for audio electronics. The thesis contain design of a block diagram of the digital audio amplifier and describes the requirements for functional blocks. As a basic device for audio signal processing was choosen integrated circuit STA326. The thesis continue with circuits design for each blocks with a description of their principles. The next section describes the construction and firmware for microcontroller. The last part of this diploma thesis is targeted on the presentation of the measured parameters of the amplifier. The conclusion summarizes the results that have been achieved and advantages and disadvantages of the digital audio amplifier prototype.

This thesis describes the design of a modem for a communication over residential power lines. First part is focused on the history, suitable frequency bands, modulation techniques and mainly on the selection of the optimal modem device. Second section contains the description of the hardware design of the modem itself and clarifies the implementation of the PLC module to be used as a communication interface for a full residential automation solution. Last chapters of this thesis introduce the communication protocol, design of the software for the ATmega32 MCU and present of the final field testing under real conditions.

The aim of this master thesis is to propose a system for monitoring and regulating the climate in groups of terrariums using the Raspberry Pi platform and subsequent transparent display through the web server. Each group of terrariums has its own control device that wirelessly communicates with the Raspberry Pi control computer. The measured values are stored in the MySQL database on the control computer. The measured values are graphically displayed on the web page.

This master's thesis is concerned about embedded system for automatic water renewal in aquariums. Besides water renewal system also controls lights and ventilation in aquarium fish breeding station. In this report you will find informtions about technology relevant to automation of aquarium fish breeding station. Also you will find here informations about design and implementation of my specific final working solution.