1,720,990 research outputs found
Alternative energy source for lifetime extension of autonomous device.
No full textPurpose of the project – design and research alternative energy source for lifetime extension of autonomous device. By saving energy and supplying it from renewable sources, it is possible to create autonomous device, which could operate a long time without changing or charging batteries. To make commercial device an autonomous, alternative energy source analysis was made, from which results solar energy harvesting was selected. The researches done to calculate energy consumption of commercial device per hour and to measure main solar panel characteristics. To design solar energy harvesting system, which would charge lithium polymer battery of commercial device, in research was calculated consumed and harvested energy per hour. Theoretical evaluation of this system is that, lithium polymer battery capacity of commercial device is insufficient. Also, amount of harvested solar energy is too small that autonomous commercial device could work without shutting down for entire year. Recommendation is to change lithium polymer battery of commercial device into battery with more capacity and increase solar panel area, or use this device during the sunny period, which is from April to September month
Mini car control electronics design.
No full textThis work goal to design a robot, more specifically human uncontrolled mini car which can track light source and avoid obstacles, electronics. In the first part of this work are analysed already made and commercially available similar devices: robotic toys and robotic lawnmowers. In the second part of this work research part are analysed. We will look over the elements which can be used in our work and we will decide which ones we will choose. In the design part of this work are made schemes design, main board design and whole mini car design
Research and development of the portable ultrasonic spectroscopy system.
No full textThe aim of this work is to design and investigate a portable ultrasound system adapted for spectroscopy research. The work presents the principles of ultrasonic spectroscopy, overviews the application areas. The analysis of the commercially available ultrasonic systems was carried out. It was shown that the systems offered on the market are not portable, do not support wireless data transmission. Commercial systems are high cost, because of the high flexibility and excessive amount of controlled parameters. Requirements for the new system design have been rectified. The structure of the system has been designed. The system consists of three main subsystems: i) excitation; ii) receiving and digitizing, and iii) control, synchronization and communication. The aforementioned subsystems have been designed and manufactured as separate devices, in order to quickly and flexibly carry out their research. Parameters measurement system has been designed and methodology created. Analysis of the parameters measurement system and methodology is presented. Components and topologies have been selected based on parameters measurements for different solution variants. Preliminary ultrasound spectroscopy measurements have been carry out using the designed ultrasonic signaling system
Investigation of ultrasonic amplifier input protection circuits.
No full textProtection circuit of receiver amplifier of an ultrasound system working in pulse-echo mode must protect the amplifier from overload and cause the least possible impact on the received signal and minimal strain on the transmitter. The transmission frequency response, recovery time and input impedance depends on the circuit topology. The parameters of all protective circuit topologies must be seen holistically. The analysis of scientific-technical literature review identified key topologies. Suggested parameters of the study and evaluation methodology, study and complex comparison topologies
Design of hardware and software for non-invasive glucometer.
No full textThe aim of this project was to design and manufacture wireless non-invasive glucometer. Determination of blood glucose level is performed using NIR absorption spectroscopy technique. „Bluetooth Low Energy“ interface was chosen for the communication with smart devices. The analytical part is used to present the diabetes mellitus problem, features and capabilities of the other similar products were analyzed. Design of the schematics, printed circuit board and software algorithms are presented in the project section
Mini car navigation design.
No full textThe purpose of this project is to design a mini car navigation. In other words we will determine thermal source location relatively to our mini car. In the first part will briefly discuss what navigation is, as well as investigate similar projects and try to find out their operating principles and areas of application. In the second analysis part we will seek to find out our tasks realization methods. We will discuss about positioning methods as triangulation, trilateration and multilateration. Also provide carried out an analysis of microcontrollers, compare them with each other. In the last part we will seek to design the navigation and the obstacle detour algorithms. Describe the influence of pulse modulation to the mini cars acceleration, deceleration and cornering. We will seek to integrate together all the algorithms described in the general grinders for the full mini car navigation algorithm implementation. Keywords:
Indoor navigation system.
No full textThere is an increasing needs of navigational systems for indoor. The work of navigation system indoor, as well as application of iBeacon technology, is analyzed. iBeacon is based on bluetooth low energy standard. The trilateratation method is chosen after the review of types of distance evaluation because it allows to identify the distance by measuring the signal propagation between two fixed points. The single module is used in order to evaluate the signal’s dependence on the distance, and to estimate the ability of the distance in the first experiment. These experiments are done by Texas Instruments module. A few supporting beacons are used in the next part of experiments. A part of these experiments was intended in order to evaluate the ability of measuring coordinates. They are made by using Minew beacons. The results are processed by a number of different options, trying to get errors as low as possible. It is examined, what influences the errors the most
The research of dependence of optical characteristics of LEDs upon operating mode.
No full textIn this work a brief of the main optical characteristics and parameters of the light sources used in research of LEDs is presented. It includes the following properties: luminous flux, colour temperature, chromaticity, lifetime. An estimation and correction methods and algorithms of variation of the optical characteristics of LEDs found in electrical devices, which require high light quality, is reviewed. The principal characteristics of the research of LEDs are distinguished. The properties of LEDs under investigation are luminous flux, colour coordinates (chromaticity) and current-voltage characteristic. Six types of LEDs, found in modern lighting systems, are chosen for observation. The set consists of amber, lime, cyan, blue and violet colour LEDs. The methodology of LEDs research is formed and experimental work environment, along with equipment, is prepared. The operating mode of LEDs working at 500 mA current in 60 degrees environment (programmable temperature chamber) is set. Under such conditions LEDs ageing is accelerated approximately by a factor of 2. The optical characteristics of LEDs are evaluated ten times at discrete time intervals of 336 hours (2 weeks) using “GL Spectis 1.0 Touch” spectrometer. Results are plotted and luminous flux, where electrical current is 200 mA and 500 mA, approximation and trend line are fitted according to the chosen models. Difference in chromaticity coordinates of LEDs during the investigation is evaluated using statistical means. An example of the effect of variation of LEDs optical characteristics to 1800 K, 2700 K and 6500 K CCT white colour light parameters is provided
Design and investigation of optoelectronic sensor for non-invasive glucometer.
No full textThe objective of the work – design and investigation of optoelectronic sensor for non-invasive glucometer. Work has been analyzed for risks of diabetes and blood glucose monitoring. At work analyzing optical non-invasive method for determining the amount of glucose in the blood and projected noninvasive optoelectronic sensor. In the literature research analyzed diabetes mellitus problem. We investigation noninvasive non-invasive methods for the determination of blood glucose levels. We chose light absorption method. Investigated it. In project part analyzed optoelectronic part geometry. Designed optoelectronic sensor
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