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Realization of USB and LAN interface for incubator
Tydor, Maximilián ; Roubal, Zdeněk (referee) ; Steinbauer, Miloslav (advisor)
This project is focused on communication between PC and microcontroller based application. It presents few available ways to do so via modern, popular and widely used communication protocols such as USB or Ethernet. The goal of this project is to enable the microcontroller to communicate with PC and via this connection transfer the data from and to a controled application so the PC user will be able to read the actual state of the device and change its settings. As a CPU an ATmega16 is used with convertor from UART to USB type FT232BM produced by FTDI company and a UART to Ethernet convertor from Lantronix Inc. called XPort.
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Accurate wattmeter for measure power loss in feromagnetic controlled AVR
Smutný, Martin ; Drexler, Petr (referee) ; Roubal, Zdeněk (advisor)
Electronic wattmeters excel in very small (up to negligible) own consumption. The basiccomponents of these devices is the multiplier - a circuit whose output voltage is proportional to the product of input voltage. Wattmeter is a device that contains two coils, one of which is the current coil voltage and the second coil. Current coil is connected in series with the measured electrical circuit and the voltage measuredparallel to the coil circuit. Current flowing through the coil current causes a magnetic field is proportional to the current flowing through the phase shift and. Electromagnetic fields of both coils influence each other in case of measurements in a DC circuit, the resultingdeflection proportional to both voltage and current. When measured in AC electrical powercircuits can be determined using the effective values of current and voltage, and their mutualphase shift. A magnetic induction B can be determined using mean values. An analog multiplier are circuits, that are realized multiplication of two analog signals. They can be made by suitable connection (according to function) discreet parts. Nowadays there are integrated circuits in advance function, whose internal structure is made by complex of circuits with operating ampfliers and other circuits. These circuits have a very high accuracy of arithmetic operation which is mostly better than 1%. The analog multiplier are used in situation, when we need realize multiplication, division, exponentation, square root extraction and logarithmic calculation of analog signals.
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Temperature and humidity measuring station for Ionmeter
Kadaňka, Karel ; Roubal, Zdeněk (referee) ; Szabó, Zoltán (advisor)
This bachelor’s thesis describes the design of meteorological station of Ionmeter. Meteorological station is controlled by the Arduino platform, which evaluates the measured data and sends them wireless into the initial concept of Ionmeter. In the first part, the particular measured variables (temperature, humidity, pressure, carbon dioxide concentration, UV radiation and amount of dust particles) are described. It also describes the brief principle of the formation of air ions and their influence of the human organism. The following chapters are dedicated to the description of each component, the description of the weather station program and the initial concept of Ionmeter. The last chapter describes the construction of the meteorological station itself.
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Accurate wattmeter for measure power loss in ferrite core
Zdražil, Lukáš ; Steinbauer, Miloslav (referee) ; Roubal, Zdeněk (advisor)
Losses in ferromagnetic materials can be measured by a wattmeter. They can be divided into eddy current losses and hysteresis losses. Loss measurements are performed on closed samples. Wattmeters should be accurate and sensitive. There are electrodynamic wattmeters used which reach the maximum deflection at a power factor less than one. Another possible way how to measure losses is by the usage of special electronic circuits. The main part of these circuits is called an analog multiplier. The analog multiplier performs a product of two input signals, especially voltage or current. For these purposes a lot of integrated circuits have been developed. The biggest producers are companies such as Analog Devices and Texas Instruments.
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Design and construction of measuring equipment for lightning research
Kirsanov, Ivan ; Krajsa, Ondřej (referee) ; Roubal, Zdeněk (advisor)
The main aim of this semester work is the design of meter of an electrostatic field in the open landscape. The theoretical part focuses on describing the theory of the creation of an electrostatic field and on proven measurement methods. The practical part of the bachelor's work is focused on the design of a measuring instrument, selection of components and justification. The practical part includes a block diagram of wiring.
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The low level measurement for determination air ion concentration
Šot, Jan ; Steinbauer, Miloslav (referee) ; Roubal, Zdeněk (advisor)
This work deals with the possibilities of small current amplification to measure the concentration of air ions using the Aspiration condenser method. The work analyzes the connection containing precision operational amplifiers and the air ions measurement method. Two amplifiers, namely an instrumentation amplifier containing an integrated circuit INA116 recording the voltage drop on shunt and a current to voltage converter, have been designed and created to measure ion concentrations. The results of measurement show that using the instrumentation amplifier means lower measurement uncertainties of type A measurement than when using the current to voltage converter.
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Thermoregulator of piezoelectric crystal unit
Roubal, Zdeněk ; Vágner, Petr (referee) ; Kasal, Miroslav (advisor)
This thesis deals with thermal stabilization of crystal oscillators. A simple thermostat of piezoelectric crystal unit is designed in first part. Main emphasis is set to low input power. The second part deals with crystal oscillators with 102,5MHz and 10MHz frequency. They are simulated with Ansoft Designer software. Both of these oscilators are measured for short term and midterm frequency stability.
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Detection of absolute position of object based on relative change of phase
Demydenko, Serhii ; Roubal, Zdeněk (referee) ; Steinbauer, Miloslav (advisor)
The goal of this work is to present a new method of position detection for autonomous systems. The method suggests usage of classical triangulation technique for which the main input, the angle value, is measured using a new approach, which implies measurement of the phase difference between two wireless receivers physically placed in a specific manner. The mutual placement of the receivers is defined by the selected frequency of the transmitted signal, namely its wavelength. The thesis describes the method itself, its simulated model and some practical issues and limitations.
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Logging station for humid environments
Pavlík, Jan ; Roubal, Zdeněk (referee) ; Szabó, Zoltán (advisor)
This thesis is about the design of a meteorological station deployed in a wet environment and its construction. The station will be used for measuring meteorological instrumentation in caves, because of that the station was designed to minimize its power consumption. Firmware was designed, to allow remote control of the station. A major part of the thesis is concerned with selection and description of the sensors and components used. Near the end of the thesis the control algorithm, communication interface and construction of the device is described.
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