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Minidarpa robot - electronic layout design
Groulík, Tomáš ; Burian, František (referee) ; Kopečný, Lukáš (advisor)
Bachelor`s thesis is bent on problems mobile robotics. In forepart is genarally circumscribed architecture AVR and individual used microprocessors. Next part is intend for distance evaluation by the help of ultrasonic sensores and concrete description of used modulus. Last part is specialized in motor control and regulation of DC motor. There are described possibilities of motor control by the help of PWM and used draft of motor control and projecting of regulator.
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Lowcost proximity sensor for mobile robot based on SRF05 sensor
Majerčík, Pavel ; Najman, Jan (referee) ; Krejsa, Jiří (advisor)
This master's thesis deals with determination of properties of the ultrasonic sensor SRF05. It is about finding factors that distort or have other negative effects in any way on the proper functionality of these sensors. First of all, it was necessary to program a chip mounted on signal processing board for correct functionality and operation of sensors. Then a few sets of measurements were done to determine the behaviour of sensors for different distances. In addition, we had to carry out many more measurements to find out the influence of temperature, light conditions, material of the sensed surface or cross-noise caused by the use of multiple sensors. In the next step, the approximate shape of the transmitted ultrasound was investigated to determine the zone of detection. The last task of this thesis was to compare the SRF05 sensors with other ultrasonic sensors from different manufacturers.
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Reverberation Reduction in Transformer-Less Ultrasonic Sensors for Parking Applications
Ledvina, Jan ; Husák, Miroslav (referee) ; Štork, Milan (referee) ; Horský, Pavel (advisor)
Parkovací asistenty jsou dnes běžnou výbavou moderního automobilu. Tato funkce přímo závisí na schopnostech použitých ultrazvukových snímačů. Schopnost měřit krátké vzdálenosti bývá u těchto snímačů omezena reverberacemi (dozvukem). Tyto reverberace jsou nežádoucí jev a tato práce se zabývá možnostmi, jak je potlačit. Záměrně je hledáno řešení pro nově vznikající beztransformátorové snímače. Pro potlačení reverberací je zapotřebí použití tlumících obvodu. V této práci se probírají zejména elektrické tlumící obvody a metody. Na základě rozboru teorie tlumících metod bylo zjištěno, že praktická realizace bude vyžadovat kombinaci více metod. Kombinace sekvence nelineárního tlumení a lineárního tlumení s automaticky doladěným tlumicím obvodem se jevila jako nejlepší volba. Automatické dolaďování zajištuje spolehlivě nastavení tlumícího obvodu bez ohledu na rozptyl obvodových parametrů. Navržený koncept byl rovněž obvodově realizován a vlastnosti tlumících metod byly potvrzeny.
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Smart water pump for water container
Janík, Vladimír ; Lattenberg, Ivo (referee) ; Caha, Tomáš (advisor)
This thesis deals with the implementation of a system for measuring the amount of water in the tank using a 12V water pump. The whole system is controlled by the ESP32 microcontroller. The introduction deals with the theoretical analysis of various principles of measuring the level of liquids. The next part deals with the procedure of the construction of the measuring device and its theoretical analysis. The last part of the work deals with the control of the pump and the individual functions that provide this control. The ultrasonic distance sensor AJ-SR04M was chosen for the implementation of the device. The volume of water in the tank is calculated from its data. The ESP32 microcontroller provides system control via a web interface. The whole system was implemented and tested to measure the volume of water and its pumping in the IBC container.
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Ultrasonic field of level sensors measurement
Hlavatý, Radek ; Fialka, Jiří (referee) ; Beneš, Petr (advisor)
The paper deals with the description of the ultrasonic field around the piezoelectric sensors. The theoretical part serves as an overview for the understanding the ultrasound problematics. More closely studied is the phenomenon of ultrasound wave attenuation. At the end of the theoretical part, three different methods of field measuring were selected and described. The practical part of this work is a more detailed description of the whole measuring system available in the Continental laboratory, that has been put into operation. The system uses a reflection method to measure the ultrasonic field. Automated way of data processing in the form of a script in Python and a macro in Excel was designed. Uncertainties were determined by the test measurements, so was the repeatability of the measured results, that correspond to the physical theory.
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Lowcost proximity sensor for mobile robot based on SRF05 sensor
Majerčík, Pavel ; Najman, Jan (referee) ; Krejsa, Jiří (advisor)
This master's thesis deals with determination of properties of the ultrasonic sensor SRF05. It is about finding factors that distort or have other negative effects in any way on the proper functionality of these sensors. First of all, it was necessary to program a chip mounted on signal processing board for correct functionality and operation of sensors. Then a few sets of measurements were done to determine the behaviour of sensors for different distances. In addition, we had to carry out many more measurements to find out the influence of temperature, light conditions, material of the sensed surface or cross-noise caused by the use of multiple sensors. In the next step, the approximate shape of the transmitted ultrasound was investigated to determine the zone of detection. The last task of this thesis was to compare the SRF05 sensors with other ultrasonic sensors from different manufacturers.
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Mobile robot control system
Bugár, Loránt ; Jílek, Tomáš (referee) ; Hynčica, Ondřej (advisor)
Bachelors project is fixated for creating a mobile robot with a real time operating system. The robot control system is based on a microcontroller Arduino with ARM Cortex-m3 processor. The practical part is dealing with resolving the client-server communication with the UDP protocol, also with the identification of the engine from measured data’s by the Simulink and subsequently designing the PI regulator from the identificated data’s. In he last part of the work the focus is giving to solving the communication with I2C bus and using sensors like : accelerometer, ultrasonic sensor, infra sensor, light sensor, hall sensor and usage of a robotic arm. An application is created for controlling the robot and for visualisation of sensor readings..
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Altitude control of flying robot
Palacký, Tomáš ; Šembera, Jaroslav (referee) ; Baránek, Radek (advisor)
This bachelor’s thesis deals firstly with design and construction of a device for testing of altitude control algorithms of a flying robot. Secondly with creating and testing of an altitude control algorithm in order to apply findings while creating a copter control system. Provided is a selection and analysis of used hardware and software components – microcontroller AVR ATmega, ultrasonic sensor, motor controller and also communication interfaces IC, USART and SPI. Also design and realization of electrical wiring, circuit board and mechanical structure is being described here. The next section includes creation of software for microcontroller and PC application. The altitude control algorithm is developed using a simulation, furthermore tested and tuned for desired behavior.
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Practical verification of EMAT transducer parameters
Zlámal, Michal ; Havránek, Zdeněk (referee) ; Beneš, Petr (advisor)
The challenge is familiar with EMAT transducers, their basic characteristics and principles of operation. Inclusion of the theoretical knowledge acquired in Semester work 1 is based on the practical measurement of the frequency characteristics of transmitting and receiving part of laboratory made EMAT transducers. Based on the measured results should be followed by an improved design of sensor to achieve higher sensitivity with the appropriate shape of frequency response. For generating of exciting signal is expected to use LabVIEW programme environment. For credible results of the measurements in a broad range is needed to make broadband power amplifier for the transmitting and low-noise broadband amplifier for receiving part of EMAT transducer.
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