A complete adjustable and automated system has been developed on the base of three blocks: the first one is the mechanical and adjustable structure, which is composed by a mobile base and a rectangular arc, where the ...
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ISBN:
(纸本)9780819496850
A complete adjustable and automated system has been developed on the base of three blocks: the first one is the mechanical and adjustable structure, which is composed by a mobile base and a rectangular arc, where the photo-detector is located. The structure describes semi-spherical trajectories by means of two servomotors. Its lightweight and robustness constitutes two advantages which make it portable. The second stage corresponds to the automation of the structure movements. For controlling the motors and data acquisition, a microcontroller is employed that in turns helps keeping the cost of the overall system low. One of the servomotors is located on the lateral axis of the device;that displaces the sensor along a semi-circular trajectory of 160 degrees, almost half meridians;the other one is located at the base of the illumination source, which enables it to realize an almost complete rotation around its axis. Finally, the last stage is formed by the graphical interface. The communication protocol between the data acquisition stage and the computer is USART. The graphical user interface (GUI) is developed using Visual C#. In the same window the data acquisition deployment and the data graph generator are given;the graphs can be shown in a polar or Cartesian formats showing more than one curve, if necessary, avoiding the use of additional software. The GUI keeps the low cost of the device, obtaining a comprehensive solution to generate the irradiance patterns of light sources.
This paper discusses the tradeoffs of using two different approaches for designing and implementing digital control systems for electrical engineering course projects. The usage of an off-the-shelf microcontroller uni...
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ISBN:
(纸本)9781467313513
This paper discusses the tradeoffs of using two different approaches for designing and implementing digital control systems for electrical engineering course projects. The usage of an off-the-shelf microcontroller unit (MCU) is explored and contrasted to the more traditional approach based on personal computers (PCs), data acquisition cards (DaqCs), and programs like RTW, Lab View, and Matlab/Simulink. We discuss how an MCU-based approach was developed and tested in the design and implementation of a two-loop digital feedback control system for a Ball-and-Beam mechanical system. Results show that by using an MCU it is possible to achieve a performance comparable to that of using PC's and data acquisition cards with the added advantage of exposing students to an experience closer to the actual way most digital control systems are implemented in practice.
A set of reference designs suitable for our student design projects was developed and tested. The purpose is to make them available for students to choose the ones suitable for integration into their projects with con...
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ISBN:
(纸本)9781612844695
A set of reference designs suitable for our student design projects was developed and tested. The purpose is to make them available for students to choose the ones suitable for integration into their projects with confidence. All the reference designs are available on our website. Some of those that are intended for embedded control applications are described in this paper. They are reference designs for DC motor driver, stepper motor driver, and GPS module. These reference designs were adopted into our embedded control projects before. Other reference designs were also developed but due to limited space are not included into this paper but the hyperlinks to them are provided. Some of the interesting projects and their evaluations are also described in this paper. Another aspect of this paper is the description of the structure of the reference designs and the various issues encountered. The information should be useful to those intend to develop reference designs for their own design courses.
This paper explains why the 8-bit microcontroller IP cores are still popular in system on chip designs. It presents R8051XC configurable microcontroller core (developed at Evatronix SA) with a focus on the implemented...
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This paper explains why the 8-bit microcontroller IP cores are still popular in system on chip designs. It presents R8051XC configurable microcontroller core (developed at Evatronix SA) with a focus on the implemented enhancements of this popular instruction set architecture and on the configurability of the core. For microcontrollers embedded in ASIC or ASSP circuits effective support for software development is very important. Therefore on chip debug support (OCDS) solutions developed for R8051XC are presented along with prototyping environment and real time operating system port available for R8051XC follows. Finally application specific solutions based on R8051XC and oriented towards USB-interfaced and Ethernet-interfaced systems have been presented.
The current designs of commercial artificial hands have a low level of innovation. As feedback to the user is difficult to achieve reliably, most devices are simple in design and operation, and limited in functional r...
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The current designs of commercial artificial hands have a low level of innovation. As feedback to the user is difficult to achieve reliably, most devices are simple in design and operation, and limited in functional range. If information on the state of the hand, the forces and any slippage that is occurring is fed back to a microcontroller then more than one degree of freedom can be controlled and a greater and more natural functional range is possible. This paper describes the development of such a device. It outlines the design requirements, the methods of detection of the signals and the training required to operate the hand.
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