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Wireless dalalogger
Linek, Tomáš ; Burian, František (referee) ; Kunz, Jan (advisor)
The bachelor thesis focuses on the design and implementation of a wireless datalogger. It includes a detailed description of the issues related to wireless transmission using LoRa technology, which was utilized in the implementation. Furthermore, the design of the entire device, consisting of a central logging unit and sensor units, is described. The thesis also covers the hardware and software equipment of the wireless datalogger, including a user desktop application. The outcome of the work is the construction of a functional datalogger enabling the logging of temperature and humidity from wireless sensor modules and measurement of its parameters.
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Time synchronisation of stm32 microcontrollers
Kratochvíl, Jakub ; Havránek, Zdeněk (referee) ; Kunz, Jan (advisor)
This master's thesis focuses on the implementation of methods for time synchronization of microcontrollers and their testing. The theoretical part introduces relative and absolute methods of time synchronization. Subsequently, the testing method for time synchronization is presented, using delay measurements and Allan deviation. In the thesis, a total of 4 methods of time synchronization are implemented: GPS, DCF77, RDS, and a method utilizing a superior system. Among these methods, synchronization from the superior system proved to be the most effective, achieving synchronization of the beginning of a second within tens of nanoseconds. The best wireless method has proven to be the GPS method, with its accuracy at the beginning of seconds being in the hundreds of nanoseconds.
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Programmable resistance decade
Rusnák, František ; Havránek, Zdeněk (referee) ; Kunz, Jan (advisor)
Goal of this work is design of programmable resistance decade controlled by microprocessor from the family STM32. The resistance decade will be used for testing energy harvesters. The theoretical parts deals with market research of commonly available resistor decades. The first designs of resistance decade were created. The principles of working can be multiple. The standard principle of working resistance decade is based on resistor rows switched by relays. The work also deals with solutions where is complex resistor rows replaced by electronics active components. In the practical part of this thesis, active design was designed builded and measured for all its range. Resistor decade can generate resistance from 100 Ohms to 10 mega-Ohms. Protocol SCPI allows to use this device in automated measurement.
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Thermal Flow measurement
Beneš, Jiří ; Kunz, Jan (referee) ; Beneš, Petr (advisor)
This bachelor thesis deals with verification of properties of termo anemometric sensor P1K0 / 50. The first part consists of a theoretical description of termo anemometric principles, their evaluation, parasitic influences on the sensors and an overview of the most important features of the sensor. The second part of the thesis deals with the design and implementation of the measuring track for measuring these properties. The result of this work is to verify the properties of the P1K0 / 50 sensor, to create its mathematical model and to determine the possible applicability of the sensor in laboratory teaching.
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Upgrate of the barman machine
Kunz, Jiří ; Foukal, Roman (referee) ; Štohl, Radek (advisor)
The document describes the already realized device of the bartender, its components and the way of operation. Furthermore, the MagneMotion technology is analyzed in detail. The available components, their modifications and uses are described. The practical part describes in detail how to connect MagneMotion, create configuration files and the MagneMotion configuration itself. The last part of the work is a description of the creation of a utility program for the implementation of moving the glass between the bartender's dispensers. The individual parts of the program and the way of their solution are described in detail.
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Thermal Mass Flowmeter
Mlčoch, Albert ; Kunz, Jan (referee) ; Beneš, Petr (advisor)
The thesis deals with verification of the mathematical model of a thermoanemometric sensor of water flow according to the King's equation. The model and measuring apparatus are briefly described. The paper deals mainly with measurement and its evaluation. The model is gradually modified depending on the measured data. The measurement evaluation summarizes the current knowledge and measurement accuracy of a modified sensor model. Another part of this paper deals with the simulation of observed processes in COMSOL Multiphysics simulation software, how this software works and its outcomes. In the final part of this paper, the electronic circuit of the sensor is designed.
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Flow measurement
Pátek, Tomáš ; Kunz, Jan (referee) ; Beneš, Petr (advisor)
This bachelor thesis deals with thermal flowmeter design. In the theoretical part are briefly described flow types, general formulas of fluid mechanics and different flow measurements methods. Second practical part this bachelor thesis deals with design of thermoanemometric gas flow sensor with FS7 sensor by IST AG. Design is based on many measurementrs to get basic features of sensor IST FS7 like heater warming depending on flow, heat transfer in zero flow and basic characteristic. Based on measurements, it is designed mathematical model of sensor by two methods. So it is designed universal performing electronics, which can be used with IST FS7 or IST DFOOL sensors. It is based on development kit Texas Instrumens MSP-EXP430FR2311. Firmware and MATLAB script which processing measured data is included.
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Measurement of MEMS gyroscope parameter changes
Raichl, Petr ; Beneš, Petr (referee) ; Kunz, Jan (advisor)
The thesis is aimed on determination of parameters of MEMS gyroscopes with Allan variance. In the introduction, there is principle of gyroscopes described. The first part describes deterministic and stochastic parameters. Methods for determining these parameters are also described. In the practical part, stochastic parameters of two gyroscopes are determined with Allan variance. In the next part, thesis describes determination of changes of stochastic parameters after vibrations and shocks.
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Measuring the Parameters of Piezo Energy Harvesters
Kunz, Jan ; Novák,, Martin (referee) ; Hadaš, Zdeněk (referee) ; Beneš, Petr (advisor)
This dissertation deals with the measurement of piezoenergy harvester parameters, in particular the measurement of their efficiency. The first part of the thesis summarizes important metrics for their comparison and reviews existing measurement systems for measuring harvester performance parameters. The measurement of harvester efficiency is simplified due to the complexity of power measurement and harvester efficiency is calculated from its parameters. However, this method is not accurate because it neglects mechanical losses and has a large measurement uncertainty. For this reason, the main objective of this work is to find a way to directly measure the harvester power input and thus measure its efficiency by definition, i.e. including mechanical losses. By analyzing the power flow in the harvester power chain, a way to achieve this goal has been found. Then, I have created an automated measurement system that allows to measure the harvester power parameters and also its efficiency including the determination of measurement uncertainties. In the last section, the performance, parameters and especially the two types of efficiency for commercially available harvesters are compared. As expected, the efficiency evaluated according to the definition come out smaller than in the case of its simplified version. However, this ratio varies widely for different harvester types, with the new efficiency being approximately one-third for PZT harvesters but only one-hundredth for PVDF harvesters. This significant difference shows that the different types of harvesters have large differences in mechanical losses, this difference could not be measured until now and thus remained neglected.
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Methods for measuring frequency of vibration
Kunz, Jan ; Šedivá, Soňa (referee) ; Beneš, Petr (advisor)
Bachelor's thesis deals with methods for measuring frequency and phase and comparison their qualities. Thesis describes requirement for these methods and problems occuring during measurement. The part of the work is devoted various types of methods for measuring frequency and phase including a more detailed description of the counter method, weighted least square method and Fourier transform's method. The practical part of this thesis contains comparision of these three types of methods which was implemented to LabVIEW program from National Instruments company. Afterwards they were compared according to proposed methodology and tested on real signals.
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