Encontrados 27 documentos, a visualizar página 1 de 3
Low cost self-localization system with two beacons
Sobreira, Héber; Moreira, A. Paulo; Esteves, João SenaThe use of mobile robots for advertisement or entertainment purposes has been subject to several approaches without great success, mainly due to the high cost of the robots and their maintenance. This paper presents the self-localization system of an easy to use, low cost yet robust robotic platform which, expectedly, will have an increased value in the market. The low cost self-localization system of the platf...
Characterization of position and orientation measurement uncertainties in a low...
Sobreira, Héber; Moreira, A. Paulo; Esteves, João SenaDue to measurement errors, position and orientation measures provided by mobile platform localization systems remain useless until their respective measurement uncertainties are characterized. This paper presents a method of characterizing position and orientation measurement uncertainties that does not require considerable computing power and has been implemented in an easy to use, low-cost yet robust robotic ...
Microcontroller-driven hydrogen fuel cell car
Queirós, Hugo; Lafuente, António; Sepúlveda, João; Esteves, João SenaThis paper presents a fuel cell car with 8 minutes autonomy, capable of following a white line on a black track, using infrared sensors that detect white and black colors. A servomotor controls its direction. Guidelines to the servomotor are given by a system based on an 8051 microcontroller, according to the information it receives from the infrared sensors. The hydrogen needed by the fuel cell is produced by ...
Miniature thermoelectric power plant
Moreira, António, 1957-; Freitas, Ricardo; Sepúlveda, João; Esteves, João SenaThis paper describes a miniature thermoelectric power plant made with the boiler and the water pump from an old starch iron. It also uses a computer cooling fan, which serves as electric power generator. The boiler vaporizes the water it receives from the water pump. Then, the steam is injected on the turbine of the fan, making it twirl. The voltage generated by the fan is enough to lighten a couple of LEDs. A ...
Partitive mixing of colours interactive device
Veiga, Ricardo; Correia, Raquel; Esteves, João SenaRotating a disk with differently coloured sectors is a well-known means of achieving partitive mixing of colours. Most educational devices applying this technique use a single motor that spins only one disk at a time, requiring different disks to be swapped between them. This paper describes an interactive device equipped with five motors, each one holding its own disk. These motors can be switched on individua...
Computer-controlled model railroad
Pereira, Nino; Castro, Hélder; Sepúlveda, João; Esteves, João SenaModel railroads are good test beds for several scientific experiments on Electromagnetism, Electronics, Automation, Control and Computer Science. Moreover, they are eye-catching structures very well suited for science-fair events. This paper describes a 2m x 1m model railroad layout and a user-friendly program, built with LabVIEW graphical language. The program is able to control train direction and speed, and ...
Handmade series direct current motor
Pedrosa, Delfim; Esteves, João SenaIt is possible to build a variety of very simple – and yet functioning – electric devices using common materials. These devices can be used to verify Electromagnetism fundamentals. Electric currents within magnetic fields originate forces and that is the basic principle of operation of electric motors. This paper describes a universal series motor made with iron bars, insulated copper wire, two small brass plat...
Alternating current and direct current generator
Portela, Pedro Miguel Dourado; Sepúlveda, João; Esteves, João SenaSpinning a wire loop within a uniform magnetic field in a convenient fashion induces a voltage between the loop terminals. This effect can be used to build an electric power generator, such as the one described in this paper. A coil attached to a shaft spins within the magnetic field of a "U" shaped magnet. Three conveniently designed conductive disks allow the electrical load of the generator to be fed either ...
Partitive mixing of colours interactive device
Veiga, Ricardo; Correia, Raquel; Esteves, João SenaRotating a disk with differently coloured sectors is a well-known means of achieving partitive mixing of colours. Most educational devices applying this technique use a single motor that spins only one disk at a time, requiring different disks to be swapped between them. This paper describes an interactive device equipped with five motors, each one holding its own disk. These motors can be switched on individua...
Thermonuclear power plant model
Esteves, João Sena; Sepúlveda, JoãoThis paper describes a model of a thermonuclear power plant with a very detailed electrical substation. The model includes facilities such as an operational railroad, a train shed, a container crane and two diesel oil filling stations. The result is very eye-catching and most suitable for the classroom or science-fair events. A brief technical explanation on the components of real-world nuclear power plants and...
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