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Visual inspection of PCB installation
Cherniaev, Egor ; Dobrovský, Ladislav (referee) ; Matoušek, Radomil (advisor)
Vizuální kontrola DPS je významnou oblastí rozvoje aplikované informatiky v elektronickém průmyslu. Předložená práce je věnována teoretickému průzkumu používaných algoritmů pro identifikaci defektů montáže komponent na desky plošných spojů a praktické implementaci systému pro automatizaci obecné vizuální kontroly. Průzkum je primárně zaměřen na případy chybějících komponent, orientaci kapacitorů a kvalitu potisku na desce. Praktická část je věnována návrhu a implementaci vlastního systému na frameworku ROS2. Práce popisuje různé aspekty vývoje a použití daného systému. Součástí práce je veřejně přístupný dataset s více než 300 snímky DPS získanými průmyslovou kamerou. Závěrem je provedeno hodnocení přínosu předložené práce.
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Design of a rotary pendulum with a flexible joint
Palát, Ondřej ; Formánek, Martin (referee) ; Dobossy, Barnabás (advisor)
This Bachelor thesis is focused on design of laboratory equipment with flexible joint. It describes construction, control electronics design, microcontroller programming and mathematical modelling describing flexible joint dynamics. Model parameters were estimated based on measurements. First part also describes market survey and brief description of algorithms used for numeric parameter estimation.
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Design of a spherical microphone array
Voch, Filip ; Schimmel, Jiří (referee) ; Liska, Matej (advisor)
Spherical microphone array is one of the ways to record spatial sound. This paper proposes rigid spherical array for beamforming and mixed order ambisonics using MEMS sensors connected with TDM bus. MEMS sensors are used due to their small size. Digital output signal is transferred to external signal processor using time division multiplexing. This paper describes an approach to design of the array for beamforming using mathematical methods for node layout on a sphere and for ambisonics using spherical harmonic functions. For prototype realization there is created design with uniformly distributed microphones on the sphere. There are flexible printed circuit boards designs for connecting the microphones. Those boards are then connected to central printed circuit board, where are the signals converted to resp. from differential signal for transfer between the array and the signal processor. RJ-45 connectors are being used for this transfer. Microphones are connected to the buses by USB-C connectors. The result is framework solution including 3D model and printed circuit board designs for microphone connection. 3D model is designed in Fusion 360 software and printed circuit boards in KiCad.
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System for Support of Short-Term Car Rentals Based on Carsharing
Vrtal, Petr ; Bidlo, Michal (referee) ; Šimek, Václav (advisor)
The aim of this thesis is to create a system for the transformation of an ordinary passenger car into a vehicle capable of sharing in the form of short-term loans. Vehicle rentals are completely unattended, which was achieved by implementing service applications in the form of an administration and user tool. The administrative application was created using web technologies, primarily Next.js and React. The customer application was implemented with the goal of high portability, and therefore its development was directed to mobile platforms using the React Native framework and the Expo tool. The vehicle is equipped with its own designed IoT end device in the form of a printed circuit board, capable of permanent wireless connection to the network based on LTE-M technology and MQTT protocol. The purpose of this device is to provide current vehicle data obtained by reading communication on the CAN bus, connecting to a standard OBD-II diagnostic port. An important part of the work was the execution of a series of tests of all sub-aspects of the implemented architecture, focusing mainly on reliability, resulting functionality and user-friendliness. The resulting system was tested in real operation and represents a way of non-invasively transforming a regular passenger car into a car capable of sharing.
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Preamplifier for guitar pickups
Raimr, Jakub ; Balík, Miroslav (referee) ; Hanák, Pavel (advisor)
This thesis focuses on design and realization of a 4-channel preamplifier for guitar pickups. The preamplifier is determined to measure balanced spectral characteristics of all four pickups at the same time. The thesis composes of a theoretical introduction about pickups, installation of pickups in the acoustic guitar, measuring spectral characteristics of pickups, design of the preamplifier on a both-sided PCB, realization of the PCB and final measurement using the finished preamplifier. The final product will serve as a~laboratory exercise in the course Hudební elektronika.
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Programmable attenuator for laboratory measurement
Husslik, Tomáš ; Šimka, Marek (referee) ; Polák, Ladislav (advisor)
This thesis deals with the design of a programmable attenuator with digital control. The main objective of the work is to design and create an attenuator with a nominal impedance of 50 , providing adjustable attenuation in the range of 0 to 40 dB, functioning within a bandwidth of 1 to 2 500 MHz. Control of the proposed attenuator is facilitated by a microcontroller that manages the settings of an integrated circuit attenuator. Furthermore, the attenuator features a basic user interface. A PCB was designed for the attenuator and subsequently manufactured. The device was then assembled and its key parameters were measured.
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Lead-free solder joint and environmental impacts
Kudláček, František ; Zatloukal, Miroslav (referee) ; Starý, Jiří (advisor)
The aim of this bachelor thesis is to determine the effect of low-temperature lead-free solder during the aging process. The theoretical part deals with the types of lead-free solders and solder pastes used for the production of electrical circuits. In the practical part we deal with the design and measurement of the PCB. For our analysis, we pay more attention to the solder paste type Sn42Ag1Bi57 and its temperature profile. A four-point measurement method is used for evaluation, which shows us the difference between the measured values.
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Servo-drive control by Zedboard platform
Kozumplík, Miroslav ; Bartík, Ondřej (referee) ; Veselý, Libor (advisor)
The Master`s thesis deals with the creation and implementation of a servo drive control using the Zedboard platform. The aim of the thesis is to describe the method of Field-Oriented Control of synchronous motor with permanent magnets. The FOC algorithm is implemented by using an automatic IP Core generation for the FPGA in the Zynq-7000 SoC. A printed circuit board is designed to interface the Zedboard platform with a real PMSM servo drive. The designed PCB contains a two-level voltage invertor composed of MOSFET transistors, Hall probes for measuring the current through the motor phases and other elements necessary for the control and feedback of the PMSM motor controlled by FOC and SVPWM algorithm.
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LoraWAN gateway for sensor network
Rehberger, Marek ; Juráň, Radovan (referee) ; Krajsa, Ondřej (advisor)
The master thesis deals with the design and implementation of a communication gateway for IoT technology, specifically LoRa / LoraWAN technology. In the practical part, the circuit diagram was developed and the circuit board was constructed in the Fusion360 program, and the software part was created for communication and data collection between the sensor part and the MQTT server.
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