Lighting Compensator Using a Diode LED as Light Sensor and Actuator

En este trabajo se presenta un sistema electrónico capaz de controlar la polarización directa e inversa aplicada en las terminales de un Diodo Emisor de Luz (LED) lo cual permite configurarlo como actuador y sensor de luz conmutadamente, con la finalidad de diseñar un sistema que permita compensar niveles de potencia lumínica a un valor fijado por el usuario. Se describe el diseño electrónico conformado por un bloque análogo y un procesador de bajo desempeño Arduino UNO, que permitió validar: el funcionamiento del LED en su dualidad de operación y el algoritmo implementado. Para el montaje desarrollado fue posible definir una ecuación experimental que permite determinar el nivel de potencia lumínica que debe ser aportado por el LED compensador, adicionalmente se calculó el porcentaje PWM que debe ser aplicado en sus terminales. A través del montaje implementado fue posible hacer la medición de la fotocorriente entregada por el LED configurado como sensor de luz y posteriormente convertirla a voltaje por medio del acondicionamiento análogo. Finalmente se logró un algoritmo que permite realizar la compensación de potencia lumínica.This work presents an electronic system capable of controlling the direct and inverse polarization applied to the terminals of a LED diode; this allows configuring it as an actuator and light sensor interchangeably. The final goal is to design a system that compensates levels, set by the user, of luminesce potency. The design is described by an Analog block and a low-tech processor Arduino UNO. The Arduino UNO allowed for the functioning of the LED to operate dually by the implemented algorithm. An equation for the developed set was defined experimentally which determines the luminesce potency that the compensating LED should provide; the duty cycle for the PWM applied to the LED terminals was calculated too. Through the developed set it was possible to measure the photocurrent given by the LED configured as light sensor and then turn it into a voltage through the analog block. FInally an algorithm was obtained to compensate luminesce potency

NASA Automated Rendezvous and Capture Review. Executive summary

In support of the Cargo Transfer Vehicle (CTV) Definition Studies in FY-92, the Advanced Program Development division of the Office of Space Flight at NASA Headquarters conducted an evaluation and review of the United States capabilities and state-of-the-art in Automated Rendezvous and Capture (AR&C). This review was held in Williamsburg, Virginia on 19-21 Nov. 1991 and included over 120 attendees from U.S. government organizations, industries, and universities. One hundred abstracts were submitted to the organizing committee for consideration. Forty-two were selected for presentation. The review was structured to include five technical sessions. Forty-two papers addressed topics in the five categories below: (1) hardware systems and components; (2) software systems; (3) integrated systems; (4) operations; and (5) supporting infrastructure

NASA Tech Briefs, April 1995

This issue of the NASA Tech Briefs has a special focus section on video and imaging, a feature on the NASA invention of the year, and a resource report on the Dryden Flight Research Center. The issue also contains articles on electronic components and circuits, electronic systems, physical sciences, materials, computer programs, mechanics, machinery, manufacturing/fabrication, mathematics and information sciences and life sciences. In addition to the standard articles in the NASA Tech brief, this contains a supplement entitled "Laser Tech Briefs" which features an article on the National Ignition Facility, and other articles on the use of Lasers

Robust Controller for Delays and Packet Dropout Avoidance in Solar-Power Wireless Network

Solar Wireless Networked Control Systems (SWNCS) are a style of distributed control systems where sensors, actuators, and controllers are interconnected via a wireless communication network. This system setup has the benefit of low cost, flexibility, low weight, no wiring and simplicity of system diagnoses and maintenance. However, it also unavoidably calls some wireless network time delays and packet dropout into the design procedure. Solar lighting system offers a clean environment, therefore able to continue for a long period. SWNCS also offers multi Service infrastructure solution for both developed and undeveloped countries. The system provides wireless controller lighting, wireless communications network (WI-FI/WIMAX), CCTV surveillance, and wireless sensor for weather measurement which are all powered by solar energy

Mechatronics examples for teaching modeling, dynamics, and control

Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.Includes bibliographical references (leaves 109-110).This thesis presents the development of a single-axis magnetic suspension. The intention is to use this system as a classroom demo for an introductory course on modeling, dynamics, and control. We solve this classic nonlinear controls problem with feedback linearization; the main advantage with this technique is operating point independency. However, it is highly sensitive to modeling errors and unpredicted plant behavior. We overcome these barriers by using a model based on both theory and experimentally determined behavior. This paper details the theory, modeling, and implementation, concluding with performance analysis.by Yi Xie.M.Eng

Ultrasonic Radars based Military Security System for Identification of Trespassers

The purpose of this project is to design and construct automatic missile detection and destroying system.  This system is designed to detect the target (missile) moving in multiple directions. The target destroying system moves automatically in the direction of missile and fires it upon fixing the target. This system consists of an intelligent sonar-based object tracking system that continuously monitors the target.  Upon detecting the target, it sends the target’s location to a Central Control System.  The Central Control System takes the action of moving the firing mechanism in the direction of target (missile). Upon fixing the direction, it sends the control command to firing system for attacking the target. In this project we are making use of ultrasonic radar system and a DC geared motor driven firing unit interfaced with a Microcontroller based control unit. The ultrasonic sensor movement is maintained by the servo motor fixed within it. The servo motor is made to revolve through fixed angles; if object is detected then the angle position is sent as the input to the launcher fixed servo motor. The launcher will release the missile fixed within it because the Ultrasonic sensors covers larger sensing distance, and it can detect the target in all the lighting conditions (day or night). The programming of Microcontroller is done using Embedded ‘C’

NASA Tech Briefs, August 1992

Topics include: Electronic Components and Circuits; Electronic Systems; Physical Sciences; Materials; Computer Programs; Mechanics; Machinery; Fabrication Technology; Mathematics and Information Sciences; Life Sciences

Design and Control of Power Converters 2019

In this book, 20 papers focused on different fields of power electronics are gathered. Approximately half of the papers are focused on different control issues and techniques, ranging from the computer-aided design of digital compensators to more specific approaches such as fuzzy or sliding control techniques. The rest of the papers are focused on the design of novel topologies. The fields in which these controls and topologies are applied are varied: MMCs, photovoltaic systems, supercapacitors and traction systems, LEDs, wireless power transfer, etc