• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 182
  • 89
  • 83
  • 72
  • 10
  • 7
  • 7
  • 7
  • 7
  • 6
  • 5
  • 4
  • 3
  • 3
  • 2
  • Tagged with
  • 480
  • 181
  • 92
  • 71
  • 71
  • 63
  • 59
  • 53
  • 50
  • 48
  • 47
  • 46
  • 42
  • 41
  • 41
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
131

Sistema automatizado de aquisição, em tempo real, de umidade e temperatura do solo na irrigação / Automated system acquisition in real time, temperature and moisture in irrigation

Diniz, Anibal Mantovani 08 March 2017 (has links)
Submitted by Neusa Fagundes (neusa.fagundes@unioeste.br) on 2017-09-01T19:08:17Z No. of bitstreams: 1 AnibalM_Diniz2017.pdf: 2918535 bytes, checksum: ae39600214cf1d4dcb6e70a9e1eaa150 (MD5) / Made available in DSpace on 2017-09-01T19:08:17Z (GMT). No. of bitstreams: 1 AnibalM_Diniz2017.pdf: 2918535 bytes, checksum: ae39600214cf1d4dcb6e70a9e1eaa150 (MD5) Previous issue date: 2017-03-08 / The modern agriculture is based on the application of techniques, methodologies and equipment that optimize their processes, thus increasing agricultural production, reducing costs and interfering less in nature. An important area of research in Agricultural Engineering is the development and use of equipment and sensors electronic to support increased agricultural productivity. This work presented a contribution to irrigation through the development and use of free software and hardware for direct measurements of soil moisture and temperature values during the plant cycle, thus allowing optimize the use of water in the process. In the system proposal, four moisture sensors were used, one resistive and three capacitive. The research was carried out in the laboratory and the soil used in the experiment was collected at the Experimental Nucleus of Agricultural Engineering of the State University of the West of Paraná. The soil was characterized as typical Distroferric Red Latosol and very clayey texture (66%). The soil was discarded and oven dried, then divided into 20 containers with addition of known water volumes in each. A network of Mesh-type sensors was developed to read and transmit data read to a single Gateway. The sensor node was designed and built with an Arduino Nano, NRF24L01 radio, capacitive sensors of type SHT20 and DHT22 in addition to FC-28 that is resistive. The system also featured a Real Time Clock DS1302, three photovoltaic cells and battery charger circuit. The Gateway circuit that connects the system to the internet was built with an Arduino Uno. Domoticz software was used to store the data and make it available on a server connected to the Internet. The data were obtained from the sensors placed in the containers and one of the results was the cubic modeling of the relationship between each of the sensors, the TDR and the greenhouse method. The values of the coefficient of statistical determination obtained show that the models that best explain the relation between the values obtained by the greenhouse method are the TDR and the resistive sensor, although the other sensors also presented a good coefficient of determination. The consumption of the sensor node board is 168 mW and the distance tested between devices up to 100 m showed that there was no loss of the data packet. The cost obtained from a node was R$ 251.00 and the Gateway R$ 115.00. The cost of a new TDR in Brazil of the model used in the experiment is R$ 176,000.00. Therefore, the analysis of the data presented showed the feasibility of using the sensors proposed in the network and resulted in a model to be applied for each device at a viable cost to the rural producer. / A agricultura moderna está baseada na aplicação de técnicas, metodologias e equipamentos que otimizem os seus processos, aumentando, assim, a produção agrícola, reduzindo custos e interferindo menos na natureza. Uma área importante de pesquisa na Engenharia Agrícola é o desenvolvimento e a utilização de equipamentos e sensores eletrônicos para apoiar o aumento da produtividade agrícola. Este trabalho apresentou uma contribuição para a Irrigação através do desenvolvimento e uso de software e hardware livre para medições diretas das grandezas de umidade e temperatura no solo durante todo o ciclo da planta, permitindo assim que sistemas otimizem a utilização da água no processo. Na proposta do sistema foram utilizados quatro sensores de umidade, um resistivo e três capacitivos. A pesquisa foi realizada em laboratório e o solo utilizado no experimento foi coletado no Núcleo Experimental de Engenharia Agrícola da Universidade Estadual do Oeste do Paraná. O solo foi caracterizado como Latossolo Vermelho Distroférrico típico e textura muito argilosa (66%). O solo foi desterroado e seco em estufa, depois dividido em 20 recipientes com adição de volumes de água conhecidos em cada um deles. Foi desenvolvida uma rede de nós sensores do tipo Mesh para ler e transmitir os dados lidos para um Gateway único. O nó sensor foi projetado e construído com um Arduino Nano, rádio NRF24L01, sensores capacitivos do tipo SHT20 e DHT22 além do FC-28 que é resistivo. O sistema também contou com um Real Time Clock DS1302, três células fotovoltaicas e circuito carregador de bateria. O circuito do Gateway que conecta o sistema à internet foi construído com uma Arduino Uno. Para armazenar os dados e disponibilizá-los utilizou-se o software Domoticz em um servidor conectado à internet. Os dados foram obtidos a partir dos sensores colocados nos recipientes e um dos resultados foi a modelagem cúbica da relação entre cada um dos sensores, o TDR e o método da estufa. Os valores do Coeficiente de Determinação estatística obtidos indicam que os modelos que melhor explicam a relação entre os valores obtidos pelo método da estufa são o da TDR e do sensor resistivo, apesar de que os outros sensores também apresentaram um bom coeficiente de determinação. O consumo da placa do nó sensor é de 168 mW e a distância testada entre os dispositivos até 100 m demonstrou que não houve perdas do pacote de dados. O custo obtido de um nó foi de R$ 251,00 e do Gateway de R$ 115,00. O custo de um TDR novo, no Brasil, do modelo utilizado neste experimento é de R$ 176.000,00. Logo, a análise dos dados apresentada mostrou a viabilidade de se utilizar os sensores propostos em rede e resultou em um modelo a ser aplicado para cada dispositivo a um custo viável ao produtor rural.
132

Desenvolvimento de uma Unidade de Ensino Potencialmente Significativa para o conteúdo de eletrodinâmica orientada por um protótipo interativo que utiliza a plataforma Arduino para controle de dispositivos e medidas elétricas

Araujo, Silvia Costa 13 February 2017 (has links)
Submitted by Renata Lopes (renatasil82@gmail.com) on 2017-05-19T18:09:29Z No. of bitstreams: 1 silviacostaaraujo.pdf: 6821138 bytes, checksum: 97044d89d7994ebf1b2f9414bfe22108 (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2017-05-22T17:22:00Z (GMT) No. of bitstreams: 1 silviacostaaraujo.pdf: 6821138 bytes, checksum: 97044d89d7994ebf1b2f9414bfe22108 (MD5) / Made available in DSpace on 2017-05-22T17:22:00Z (GMT). No. of bitstreams: 1 silviacostaaraujo.pdf: 6821138 bytes, checksum: 97044d89d7994ebf1b2f9414bfe22108 (MD5) Previous issue date: 2017-02-13 / O presente trabalho tem por objetivo relatar o desenvolvimento de um produto educacional de baixo custo para o ensino de eletrodinâmica usando a plataforma Arduino como interface para simulações e aquisição de dados. Para a aplicação desse produto foi desenvolvida uma Unidade de Ensino Potencialmente Significativa (UEPS) com base na Teoria de Aprendizagem Significativa de David Ausubel (2000) proposta por MOREIRA(2006). O protótipo consiste em um conjunto de dispositivos, controlados pelo Arduino, ligados de tal forma que possam simular os diversos circuitos de uma residência. O produto é capaz de demonstrar a potência elétrica e a energia consumida por diversos aparelhos eletroeletrônicos, além de permitir entender o funcionamento de diversos sensores eletrônicos. O dispositivo que foi montado permite fazer medidas da corrente e da tensão elétrica através de uma gaveta interativa. Serão atribuídas licenças permissivas a todo o material desenvolvido para que estudantes, professores, pesquisadores e demais membros da sociedade possam utilizar, estudar, modificar e compartilhar livremente todo o material produzido. A proposta foi implementada em duas turmas do terceiro ano do ensino médio de uma escola pública de um município do interior de Minas Gerais. Os resultados obtidos nos levaram a concluir que a aula se tornou muito mais atrativas e participativas, uma vez que os alunos tiveram a prédisposição para aprender, bem como houve a evolução conceitual e cognitiva, a interação com todo conteúdo teórico e prático, relacionando situações-problema cada vez mais complexas e promovendo uma aprendizagem significativa. / The present work has the objective of reporting the development of a low cost educational product for the teaching of electrodynamics using the Arduino platform as interface for simulations and data acquisition. For the application of this product a Potentially Significant Teaching Unit (UEPS) was developed based on the Significant Learning Theory of David Ausubel (2000) proposed by MOREIRA (2006).The prototype consists of a set of devices, controlled by the Arduino, connected in such a way that they can simulate the different circuits of a residence. The product is able to demonstrate the electric power and the energy consumed by several electronic devices, besides allowing to understand the operation Of various electronic sensors. The device that has been assembled allows to measure current and voltage through an interactive drawer. Permits will be granted to all material developed so that students, teachers, researchers and other members of society can use, study, modify and freely share all the material produced. The proposal was implemented in two classes of the third year of high school in a public school in a municipality in the interior of Minas Gerais. The results lead us to conclude that the class has become much more attractive and participative, since the students had the pre-disposition to learn, as well as the conceptual and cognitive evolution, the interaction with all theoretical and practical content, relating Increasingly complex problem situations and promoting meaningful learning.
133

O uso de Arduino na criação de kit para oficinas de robótica de baixo custo para escolas públicas / Using Arduino kit for creating robotics workshops for low cost public schools

Fabri Junior, Luiz Ariovaldo, 1983- 24 August 2018 (has links)
Orientadores: Marli de Freitas Gomes Hernandez, Paulo Sérgio Martins Pedro / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Tecnologia / Made available in DSpace on 2018-08-24T15:23:29Z (GMT). No. of bitstreams: 1 FabriJunior_LuizAriovaldo_M.pdf: 11888804 bytes, checksum: 4d030c6b8e5616c9ad8f61669c544dfb (MD5) Previous issue date: 2014 / Resumo: Neste trabalho apresentamos o desenvolvimento de um kit para aplicação de oficinas de robótica de baixo custo para introdução às engenharias nas escolas públicas de ensino médio brasileira. Para desenvolver este trabalho foi utilizado a placa microcontrolada Arduino, versão Uno, o Minibloq que é um ambiente de desenvolvimento gráfico para computação física que utiliza blocos para desenvolvimento de programação, também desenvolvemos uma apostila para acompanhamento passos a passo do desenvolvimento das oficinas. Com esta oficina de robótica educacional, pretendemos introduzir conceitos de física, matemática, programação e robótica básica, conceitos que estão estritamente relacionados com as engenharias / Abstract: This paper presents the development of a kit for implementing a robotics workshop for low cost introduction to engineering in the public schools of Brazilian high school. To develop this work microcontrolled Arduino Uno board version was used, Minibloq which is a graphical development environment for physics computation that uses blocks to development programming, we also developed a booklet to follow step by step the development of the workshop. With this educational robotics workshop, we plan to introduce concepts of physics, mathematics, programming and basic robotics concepts that are closely related to engineering / Mestrado / Tecnologia e Inovação / Mestre em Tecnologia
134

Arduinobaserad hundpejl

Larsson, Oskar January 2017 (has links)
En hundpejl är idag något absolut nödvändigt vid löshundsjakt. Anledningen är att jägaren måste veta vart hunden är och helst också vad som sker. Idag när trafiken ökar allt mer är det av vikt att i tid kunna avgöra om hunden är på väg mot en trafikerad väg. Om hunden blir still har man möjlighet att i tid avgöra om den fastnat eller har gått i vatten och har möjlighet att hinna fram i tid för att hjälpa. Och då hundpejlar ofta kostar mer än 2000 kronor så finns det ett önskemål om att ta fram billigare varianter av hundpejlar. Målet i detta projekt är därför att konstruera, montera och programmera en pejl av Arduino UNO och Adafruit FONA 808 som uppfyller de krav, såsom en batteritid på minst 8 timmar och ett precisionsfel på max 5 meter, som en jägare ställer på en pejl som samtidigt är billigare en kommersiell produkt med liknande prestanda. Tillgångavägssättet var sådant att först studerades relevant litteratur såsom Adafruits produktbeskrivning och testkod, sedan testades de olika enskilt funktionerna, skicka, ta bort och läsa SMS samt hämta GPS-koordinater. När det var klart att funktionerna fungerade programmerades en kod som erhåller de egenskaper som en användare önskar sig.  Därefter utvärderades pejlen för att se om den uppfyller de ställda kraven. Det som testades var pejlens vikt, batteritid och positionsnoggrannhet. Vikten mättes på en köksvåg, batteritiden mättes genom att testa batteriladdningen en gång i timmen över tre timmar och positionsnoggrannheten mättes på sådant sätt att pejlens koordinater jämfördes med resultatet från Google Maps och Eniro. Det visade sig att pejlen inte helt uppfyller alla krav, då positionsnoggrannheten inte direkt uppfyller de kraven som är ställda. Dock är enheten fortfarande användningsbar för spårning då den ger en tillräcklig generell area för att kunna hitta en hund på. Pejlen kan även användas i andra syften, till exempel placera den i en bil utifall stöld. Den ger även en bas att vidareutveckla en hundpejl ifrån till exempel skicka ljud till en telefon vilket även intresserar jägare. / A dog tracker is something that is essential when hunting with a dog. The reason is because the hunter needs to know where the dog is always, while preferably as well knowing what happens with the dog. Today, when the traffic is increasing and more, it is of importance to be able to determine whether the dog is heading for a busy road. The tracker also gives the hunter the possibility to rescue the dog if it gets stuck or fall in water. Dog trackers are of importance to the hunter, but they are also expensive, most costs more than 2000 SEK/230 USD, so there is a desire for a cheaper dog tracker that still fulfil the demands that hunters or dog owners require. The goal of this project is to design, build and program a dog tracker from Arduino UNO and Adafruit FONA 808, that meets the requirements stated by a user and at the same time are cheaper than the commercial equivalents. The method used are such that first relevant documents, such as Adafruit product description and testcode, are studied to gain an understanding of the units used. The units were then tested by the testcode to ensure that all parts are working correctly, this was done by testing read, delete and send SMS and get GPS-coordinates. When it was sure that all parts worked correctly a code was programmed that fulfilled all the requirements requested by a user. Then the finished dog tracker was evaluated to ensure that it fulfilled the requirements. Weight, battery time and positioning accuracy was tested, where weight was tested by a kitchen scale, battery time was tested by measuring the loss of charge once an hour over a period of three hours. From what was measured in those three hours a battery time was calculated by extrapolating loss of battery power/hour. The positioning accuracy was measured by using the dog trackers coordinates and comparing them to Google Maps and Eniro coordinates. The conclusion of the project is that the dog tracker didn’t fulfil all the requirements, its positioning accuracy didn’t reach the requirement of max 5-meter error. Though the dog tracker is still usable for tracking because it still gives a good enough positioning for finding a dog. The dog tracker can also be used for other purposes such as placing in a car to track it in event of a theft. The dog tracker also acts as a base for future developments, like using it to send sound which is also of interest for a hunter.
135

Návrh malé modelářské CNC frézky s pohyblivým stolem / Design of small modeling CNC milling machine with movable table

Havlíček, Ondřej January 2019 (has links)
This master thesis deals with the constructional design of small CNC milling machine with a sliding table. The first part of the work describes small CNC milling machines currently available on the market. Based on the result of the literature review, the small CNC milling machine was constructed with respect to the currently available trends, including sizing and drawing documentation of the machine.
136

Příprava scény pro detekci elektronických součástek / Adjustment of scene for electronic devices detection

Hynčica, Tomáš January 2010 (has links)
This work describes development of control hardware and software for automatic production of tuning fork with tip for atomic force microscopy (AFM). A specialized device implementing the problem is developed and tested. The advantage of the proposed solution is the ability to produce the tuning forks with constant parameters, which is an important condition for successful work with the microscope.
137

FunkyBot : Robotrörelser styrda i takt av ljudsignaler

Mörén, Siri, Nauwelaerts de Agé, Ebba January 2023 (has links)
In the following report, a study regarding the control of a dancing robot has been conducted. The study covers whether a robot’s movements can be controlled by a recurring and pacing audio signal at a given BPM, and how well it does so. In order to test this for results, five different BPMs have been played six times each in front of a sound sensor module connected to the robot’s microcontroller to perceive the signal. The reading of this signal then adjusts the speed at which the motors rotate. Two test subjects then pressed a button in the mobile app Soundbrenner each time they found the robot to change its movement. The presses of the button then generated a beat of their own which represents the viewer’s perceived BPM of the dancing robot. This is then used to compare the desired BPM with the BPM delivered by the robot. A maximum BPM for the robot to dance to has also been studied by gradually increasing the given BPM until it no longer could use the signal. The results showed that the robot could stick to the given BPM fairly well. The mean difference between the recorded and the desired beat was 4.9 BPM. At 100 and 140 BPM the sound sensor and microcontroller were most successful in reading the beat, while found it most challenging at 120. However, environmental factors such as noise pollution were a heavyweight cause for misreadings. The results where on the other hand near flawless when the signal was isolated and clear. The maximal beat the robot could follow was read to 239 BPM because of the delay used in the microcontroller’s code. / I följande projekt undersöks styrnnigen av en dansande robot och huruvida den kan, och isåfall hur väl, urföra sina rörelser i takt till ett uppspelat BPM, uppfattat av en ljudsensormodul. För att testa detta har fem olika takter spelats upp sex gånger var. När roboten börjat dansa, har två testpersoner fått klicka på en knapp i mobilappen Soundbrenner när de upplever att roboten byter rörelse. Dessa knapptryck har då alstrat en egen takt som i sin tur jämförs med den takt som faktiskt spelades upp. Även ett maximalt BPM som roboten kan dansa till har uppmäts genom en gradvis ökning tills den inte längre erhöll någon signal. Resultaten visade att roboten klarade av att hålla sig i takt någorlunda väl. Det medelvärde som erhölls för differensen mellan det uppmätta och den önskade takten var 4.9 BPM. Vid 100 och 140 BPM var det lättast för ljudsensorn och mikrokontrollern att göra korrekta mätningar, och svårat vid 120BPM. Dock var omgivningsfaktorer som buller en stor orsak till felläsningar. När signalen var tydlig och isolerad nog var resultaten mycket goda. Den högsta takt roboten kunde följa var 239 BPM på grund av den fördröjning som användes i mikrokontrollerns kod.
138

Design and Construction of an Autonomous Sentry Turret Utilising Computer Vision / Design och konstruktion av ett autonomt vakttorn nyttjande datorseende

Bermhed, Carl, Holst, Jacob January 2023 (has links)
The design and manufacture of a sentry gun turret capable of accurately and rapidly tracking and shooting moving targets was a challenging task that required delving into various engineering disciplines. This bachelor's thesis explores this challenge by presenting the process of construction, as well as the performance results of a turret created using a combination of 3D printing, laser cutting, and metal workshop manufacturing. The subject was chosen to include different aspects of the engineering fields relating to mechatronics, and for the challenge of implementing and designing multiple systems that interconnect to effectively engage with a target. The turret was created as a two-axis robot driven by stepper motors, with a gun driven by compressed air firing 6 mm plastic airsoft pellets using a clocked timing mechanism for rapid automatic firing. It was controlled by a system separated into two parts: a PC running facial recognition and colour identification software as well as performing movement calculations through python and an Arduino micro-computer running C++ controlling stepper motors and other hardware. The turret can accurately identify a target within five meters and with great speed home in and fire at the target with significant power. / Utvecklingen av ett autonomt vakttorn som med god precision och upprepbarhet kan hitta och följa ett mål var en utmanande uppgift som krävde användning av många delar av olika ingenjörsmässiga områden. Denna kandidatexamensuppsats utforskar utmaningen genom att presentera design och framtagningsprocessen samt redovisa prestandan av ett vakttorn tillverkat med 3D-utskrift, metallverkstadsmaskiner, och laserskärning. Ämnet valdes för att inkludera olika fält i nära relation till mekatronik samt för utmaningen i att implementera och integrera elektriska och mekaniska system och på så sätt effektivt hitta och hantera ett mål. Vakttornet är en tvåaxlig robot styrd med stegmotorer som har ett mekaniskt indexerad lufttrycksvapen som helautomatiskt avfyrar 6 mm airsoftkulor. Det mekaniska systemet kontrolleras av ett tvådelat kontrollsystem: en PC som kör ansiktsigenkänning och färgidentifiering i Python samt utför beräkningar för förflyttning utifrån kameradatan, samt en Arduino mikrodator med programvara i C++ som driver stegmotorerna utifrån förflyttningsinstruktionerna. Tornet kan med god precision identifiera, sikta mot och skjuta ett mål inom fem meter med en projektil av noterbar styrka.
139

Digibar : An analysis of the future's bartender / Digibar : En analys av framtidens bartender

Degernäs, Ted, Wenning, Måns January 2023 (has links)
The objective of this project is to provide bars with a cost-effective and straightforward way to increase their output per employee, allowing them to reduce drink prices. To achieve this, we have fully automated the bartender’s process, with staff only required to refill ingredients as they deplete and handle the payment for orders. The prototype has been tested for accuracy in knowing which drink to pour as well as in the precision of how much to pour. In testing, the prototype demonstrated a high level of accuracy in identifying which drink to pour, utilizing a load cell programmed to dispense the drink closest to the measured weight. The pouring accuracy was slightly less precise, particularly at lower volumes, but still met expectations, achieving an average accuracy of 93.75 percent for low volumes, increasing to circa 100 percent for larger volumes. Overall, the goals for the prototype were achieved, and the prototype’s ability to increase efficiency and reduce costs for bars is highly feasible. / Syftet med detta projekt är att erbjuda barer ett kostnadseffektivt och enkelt sätt att öka produktionen per anställd och därmed sänka dryckespriserna. För att uppnå detta har vi fullständigt automatiserat bartenderns process, där personalen endast behöver fylla på ingredienser när de tar slut och hantera betalningen för beställningarna. Prototypen har testats för att säkerställa noggrannhet vid identifiering av vilken dryck som ska hällas upp samt precisionen i hur mycket som ska hällas upp. I tester visade prototypen en hög noggrannhet vid identifiering av vilken dryck som skulle hällas upp, genom att använda en lastcell för att mäta vikten av glaset. Hällnoggrannheten var något mindre precis, särskilt vid lägre volymer, men uppfyllde fortfarande förväntningarna och uppnådde en genomsnittlig noggrannhet på 93,75 procent för de lägsta volymerna, något som steg till cirka 100 procent vid större volymer. Övergripande sett har målen för prototypen uppnåtts och dess för måga att öka effektiviteten och minska kostnaderna förbarer är högst genomförbar.
140

U_Bot : Konstruktionen av en trådlös fjärrstyrd utbåt

Mauritz, Jonatan, Granat, William January 2023 (has links)
Abstract The goal of this project was to design a submarine that could be operated using a wireless game controller. To accomplish this, we used an Playknowlogy board connected to a USB-Host Shield that recieves signals from the game controller and sends them to a USB connected to the USB-Host Shield. The Arduino's built-in libraries interpret the signals, which are then used to control the submarine's movements in three-dimensional space. / Målet med detta projekt var att designa en ubåt som kan styras med en trådlös spelkontroll. För att uppnå detta använde vi en Playknowlogy bräda som var kopplad till en USB-Host Shield. Denna mottog signaler från spelkontrollen och skickade dem sedan vidare till en USB-anslutning på USB-Host Shield. Arduinos inbyggda bibliotek tolkar signalerna, vilka sedan används för att styra ubåtens rörelser i det tredimensionella rummet.

Page generated in 0.0297 seconds