Global ETD Search

81	Měření veličin ve stavebních konstrukcích / Meassuring system for building constructions Vladař, Martin January 2015 (has links) This thesis deals with the measurement of physical quantities in building using decentralized system for data collecting. The system consists of Raspberry Pi as a master device of the system. There are three branches connected to this master device. Each branch consists of up to 32 modules for data-concentration from sensors of physical quantities. The Raspberry Pi has implemented web interface for displaying measured values and system administration.
82	Datalogger s rozhraním Ethernet / Datalogger with Ethernet Orávik, Tomáš January 2016 (has links) Thesis deals with Datalogger with Ethernet interface controlled by Raspberry Pi 2. Datalogger is equipped with eight digital inputs and three analogue inputs. It allows storage of measured data into the database on the microSD card. It communicates over an Ethernet interface on the Raspberry Pi. The administration and control of the datalogger is possible trought a web server.
83	An integrated sensor system for early fall detection Bandi, Ajay Kumar 05 1900 (has links) Indiana University-Purdue University Indianapolis (IUPUI) / Physical activity monitoring using wearable sensors give valuable information about patient's neuro activities. Fall among ages of 60 and older in US is a leading cause for injury-related health issues and present serious concern in the public health care sector. If the emergency treatments are not on time, these injuries may result in disability, paralysis, or even death. In this work, we present an approach that early detect fall occurrences. Low power capacitive accelerometers incorporated with microcontroller processing units were utilized to early detect accurate information about fall events. Decision tree algorithms were implemented to set thresholds for data acquired from accelerometers. Data is then verified against their thresholds and the data acquisition decision unit makes the decision to save patients from fall occurrences. Daily activities are logged on an onboard memory chip with Bluetooth option to transfer the data wirelessly to mobile devices. In this work, a system prototype based on neurosignal activities was built and tested against seven different daily human activities for the sake of differentiating between fall and non-fall detection. The developed system features low power, high speed, and high reliability. Eventually, this study will lead to wearable fall detection system that serves important need within the health care sector. In this work Inter-Integrated Circuit (I2C) protocol is used to communicate between the accelerometers and the embedded control system. The data transfer from the Microcontroller unit to the mobile device or laptop is done using Bluetooth technology. Early Fall Detection Bluetooth Arduino I2C Self-care, Health -- Data processing Medical informatics Information technology -- Social aspects Digital electronics -- Research Accelerometers Bluetooth technology Arduino (Programmable controller) Embedded computer systems Biomedical engineering
84	Vision Based Temperature Input in PID-Controlled 3D-Printer Applications : Viability of IR-thermometer thermography for use in 3D printer applications / Termografisk återkoppling för PID-regulatorer i 3D-skrivare Ekelund, Vige, Hilleskog, Jakob January 2022 (has links) In 3D-printers, accurate control of temperature is important and most often a thermistor is used to regulate it. However, while thermistors are cheap, they tend to be quite inaccurate at the wide temperature range of 3D-printers. And since they need to be in contact with the object they are measuring, they have to withstand the temperature that the object operates in. This work explores the possibility and viability of using a contactless solution for temperature feedback for the PID-regulator in 3D-printers instead of thermistors. Originally this work was supposed to use a thermal camera but because of unforeseen shipping problems, the thermal camera did not arrive in time, instead an IR-thermometer was used. The work was done by modifying the software of the 3D-printer to receive temperature from an external source, two available pins on the motherboard of the 3D printer were connected to a Raspberry Pi and with a custom made communication protocol and modified firmware, temperature data could be transferred between them. An IR-thermometer was mounted on the extruder of the 3D-printer, measuring the temperature of the heating block, it was also connected to the Raspberry Pi and its reported temperature was sent to the 3D-printer. To measure the performance of the different solutions, important data was logged and a visual inspection of printed parts were conducted. The results of the work showed that it was possible to replace the thermistor with a contactless IR-thermometer with a print quality that was on par with the original solution. It was also found that the IR-thermometer had a faster response-time to changes in temperature compared to the thermistor. The IR-thermometer should also have a wider object temperature-range than the thermistor but because this work was delimited to one specific thermoplastic material with one temperature-range, this was not tested. In conclusion the contactless solution had a result better than expected and is a promising proof of concept. The price of the contactless solution is magnitudes higher than that of the thermistor but with its promising accuracy and response time to changes in temperature it could be a viable solution for industrial applications. 3D printer PID thermal imaging thermography additive manufacturing CAD programming python c++ electronics marlin IR radiation raspberry pi MLX9061 i2c communication script camera thermometer thermistor polynomial Annan elektroteknik och elektronik
85	Univerzální mikropočítačová jednotka / Universal Microcontroller Unit Kulenda, Vít January 2011 (has links) Master’s thesis contains description parameters of microcontroller ATMEGA644P, also contains differences between older and newer version of microcontrollers ATMEGA644 and ATMEGA644PA. Inside structure of microcontroller, memories and peripherals are described here. The construction of the universal microcontroller unit is main target of this thesis. The unit contains supply, A/D converter, current loop, communication interfaces, temperature sensor, accelerometer and other. The unit collects and saves data, communicates by interfaces and manages other functions. Using devices and circuits are described in this thesis. Development of software for microcontroller(firmware) are positioned to last part of this thesis. This software control functions of all parts positioned on the unit.
86	OpenBSD Hardware Sensors — Environmental Monitoring and Fan Control Murenin, Constantine Aleksandrovich 18 May 2010 (has links) This thesis discusses the motivation, origin, history, design guidelines, API, the device drivers and userland utilities of the hardware sensors framework available in OpenBSD. The framework spans multiple utilities in the base system and the ports tree, is utilised by over 75 drivers, and is considered to be a distinctive and ready-to-use feature that sets OpenBSD apart from many other operating systems, and in its root is inseparable from the OpenBSD experience. The present framework, however, is missing the functionality that would allow the user to interface with the fan-controlling part of the hardware monitors. We therefore discuss the topic of fan control and introduce sysctl-based interfacing with the fan-controlling capabilities of microprocessor system hardware monitors. The discussed prototype implementation reduces the noise and power-consumption characteristics in fans of personal computers, especially of those PCs that are designed from off-the-shelf components. We further argue that our prototype is easier, more intuitive and robust compared to solutions available elsewhere. OpenBSD BSD DragonFly DragonFly BSD FreeBSD NetBSD sensors hw.sensors sysctl fanctl fan control hardware sensors SMBus I2C hardware monitor microprocessor system hardware monitors lm lm_sensors sysmon envsys ACPI BIOS drivers device drivers open source I²C thermal temperature framework monitoring kernel Computer Science
87	OpenBSD Hardware Sensors — Environmental Monitoring and Fan Control Murenin, Constantine Aleksandrovich 18 May 2010 (has links) This thesis discusses the motivation, origin, history, design guidelines, API, the device drivers and userland utilities of the hardware sensors framework available in OpenBSD. The framework spans multiple utilities in the base system and the ports tree, is utilised by over 75 drivers, and is considered to be a distinctive and ready-to-use feature that sets OpenBSD apart from many other operating systems, and in its root is inseparable from the OpenBSD experience. The present framework, however, is missing the functionality that would allow the user to interface with the fan-controlling part of the hardware monitors. We therefore discuss the topic of fan control and introduce sysctl-based interfacing with the fan-controlling capabilities of microprocessor system hardware monitors. The discussed prototype implementation reduces the noise and power-consumption characteristics in fans of personal computers, especially of those PCs that are designed from off-the-shelf components. We further argue that our prototype is easier, more intuitive and robust compared to solutions available elsewhere. OpenBSD BSD DragonFly DragonFly BSD FreeBSD NetBSD sensors hw.sensors sysctl fanctl fan control hardware sensors SMBus I2C hardware monitor microprocessor system hardware monitors lm lm_sensors sysmon envsys ACPI BIOS drivers device drivers open source I²C thermal temperature framework monitoring kernel Computer Science
88	Zabezpečovací systém pro rodinný dům / Security system for family house Sohr, Martin January 2011 (has links) This thesis deals with complete theoretical design of security system for a family house, from the selection of technologies, security principles and selection of elements, theoretical suggestions of their placement to practical realization. I this thesis, securing of entry points, such as doors and windows, is done by magnetic contact sensors. Windows are secured also against breaking of glass. Inner space is secured using motion sensors. Further, the function principle of optical latches as secondary securing element of inner space is explained. The designed security system implements a central control unit, which is able to provide status information on all security elements to the host system. IQRF wireless communication operationg in licence-free is used for communication among elements of the security system. GSM SIM9000 module is used for communication with the security system.
89	Zařízení pro zaznamenávání proudové spotřeby LPWA senzorů / Design of a current data logger for LPWA sensors Mikulášek, Michal January 2020 (has links) This Master thesis deals with the design and construction of a measuring device for measuring and the current consumption logging of sensors using LPWAN (Low Power Wide Area Network) technology. The theoretical part of the thesis firstly summarizes selected LPWAN technologies. Selected technologies, namely: LoRaWAN, Sigfox and Narrowband IoT (NB-IoT), are described more in detail. Further, the current measurement techniques are briefly discussed. The main focus is given to the current shunt measuring methods. The second half of thesis describes procedures conducted during the design and construction of a measuring device. The current measuring is based on the current shunt circuit complemented by the voltage amplification circuit, whose output is subsquently converted into digital form using an AD converter. The thesis describes in great detail the procedures for selecting individual components and important processes used in design of printed circuit boards. An integral part of the measuring device implementation is the design and implementation of control software, which is described in detail and supplemented by workflow charts underlining the entire description. The implementation of the entire measuring device is completed by the design and implementation of the cover box using 3D printing technology. Finally, the specifications of designed device are briefly discussed based on the limits of the used components.
90	Dvoukanálový kontrolér krokových motorů / Two channel stepper motor controller Hýbl, Matouš January 2021 (has links) Cílem této práce je vývoj dvoukanálového kontroléru krokových motorů. V rámci práce je popsán jak vývoj elektroniky, tak vývoj příslušného software. Elektronika kontrolŕu je založena na mikrokontroléru STM32F405 a driverů krokových motorů vyráběných firmou Trinamic. Pro komunikaci s nadřazenými systémy je implementován protokol CANOpen a sběrnice I\textsuperscript{2}C a USB. Elektronika byla navržena v software KiCAD and využívá čtyřvrstvého plošného spoje a moderních výrobních technologií. Co se týká software, byl vyvinut jak firmware pro mikrokontrolér, tak software pro ovládání kontroléru. Obě části software využívají programovacího jazyka Rust, který se zaměřuje na bezpečnost práce s pamětí, rychlost a zero-cost abstrakce. Sekundárním cílem této práce je ukázat, jak lze tento programovací jazyk s výhodou použít pro programování nízkoúrovňového embedded software. Firmware kontroléru implementuje nezávislé řízení pohybu obou os kontroléru a to jak v rychlostním, tak v pozičním režimu a zároveň implementuje bezpečnostní funkce pro případy selhání komunikace. Výsledný kontrolér by měl být použit v rámcí výzkumné skupiny Robotiky a Umělé Inteligence a studenty na Ústavu Automatizace FEKT VUT.

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