i-magazine - Artigos On Line

Artigos on-line:

BASCOM - 8051: Windows BASIC compiler for 8051

I believe that most of us made our first programming steps in BASIC, because it was so easy to work with. Now imagine the same easiness in BASIC programming, but this time with microcontroller programming...

Dallas's Buttons or Touch Memory

Something new again. Its function is to control the entry of a room by unauthorized personnel and record if one is late. It looks simple. It reminds you of a button battery. If you lose it, you’ll never find it! You cannot even make a copy. But, it is a real thing! All these ‘anomalies’ are advantages looking from the other side of the coin. In the past, simple keys were replaced by magnetic cards, which were thin and small and could be kept in a wallet...

Mapping

The memory area of Intel’s 8051 is divided in two blocks each of 64KB. The signal PSEN enables access to external ROM, i.e. EPROM. The signals RD and WR enable reading and writing from an external RAM. In this way it is not only possible to address 64KB of ROM and 64KB of RAM memory, it is also possible to overlap ROM and RAM...

Light Dimming Regulation

This project is a light dimmer. It regulates the intensity of a standard bulb. This is an illustration of how we can use microcontrollers to control the current to a globe. In this article you can also find out how to connect a microcontroller to an AC power line, and to a triac. The same thing can be done using a triac,diac, and a few resistors and capacitors. There are numbers of electrical schematics available on the net, describing how to do this. My unit is powered directly from an AC line. Powering from the line enables the microcontroller to directly trigger a triac (for example - triggering without an opto-triac) and show how to generate the necessary program for the microcontroller.

Pulse Counter with PIC

Pulse counters are widely present in everyday life and it is hard to imagine that one day people will stop using them. Almost every museum counts visitors, as well as theaters, shopping centers, department stores, fast-food restaurants and many others. In industry each production control includes counting. In addition, market tests are performed by counting sold goods. In sports, the quality of a game is shown by attendance. There are occasions when not only physical values are counted, but many other measurements: phone pulses, time, revolutions, liquids, etc. etc....

Who's Singing Out There?

Even though sound has many advantages; until recently a connection between a machine and a human was mainly established by light indicators. Sound only draw one’s attention and in rare occasions to carry information. In other words, sound was used to signal that something happened, but not for what happened. The reason is obvious: to make a simple, ambiguous and cheap sound indicator was not easy. Until recently, when we met ISD circuits…

Spread spectrum transceiver controlled by PIC

In modern telecommunications spread spectrum methods are widely present. It doesn't matter if we use a frequency hopping method, direct sequence method or time hopping method, these aspects have a lot in common:
· Excellent signal/noise ratio,
· Efficient usage of radio spectrum,
· High immunity to jamming and minimized danger of 'listening'.
Fast development of microcontrollers provides usage of these devices in modern telecommunications. This article is to present the simplicity of a transceiver based on the spread spectrum method of frequency hopping...

VISUAL DESIGNER 4.0

"When we talk about designing a data acquisition system, we usually think about finding the most practical and optimal solution - both in hardware and software." ...

Fuzzy Logic Controllers

A wide range of opportunities has opened in the field of digitally controlled systems. Digitally measured information can be rapidly processed and complex systems are easily controlled.
The diversity of controlling software allows more creativity. A new approach in controlling was introduced, using fuzzy regulators. Anyone familiar with this process can easily implement a solution, by simply writing and changing the program code...

Silicon Rabbits

Flexibility is a characteristic in their favor - showed to be warmly welcomed. We find them all around us, from toys to the most complex uses in industry.

Real-Time Debugging Highly Integrated Embedded Wireless Devices

Highly integrated wireless solutions continue to increase in demand, as silicon providers respond with a broad array of intellectual property, increasingly dense technologies, and an industry-wide focus on System-On-Chip (SOC) design tools and integration methodologies.

MMC 2107 A 32-bit System on a Chip with FLASH

Distribution channel customers designing high-performance, cost- and power-sensitive applications, such as vending machines, building management and heating-ventilation-air conditioning (HVAC) systems, exercise equipment and lighting control need highly integrated microcontrollers off-the-shelf, to reduce system component count and fit their product requirements.

Convert Analog into Digital Challenge - Project

This competition was organized by TI together with other sponsors. The prize money totaled $60.000. First prize was $5.000. Many of the rewards were components, software, books and development tools.
This article describes my project, sent to TI for the competition. I have also provided two files, sch and pcb. You can download them at the bottom of the article...

Who Is Magdalene?

Magdalene is a code name for a robotic hand, which is being developed in our offices at the moment. The name - it just happened that some of us spelled it out...and here comes Magdalene...

PIC FUN

Set the kids up with this little project and before you know it they’ll be addicted to electronics.

DSP in data acquisition

The Positron Brain from the Isaac Asimov's SF novels - is still SF, but there is a simple fact coming out of this. We all are surrounded by a large number of "devices" whose "behavior" is fairly complicated and demands "constant monitoring of the outside world, and answering to its impulses"...

Dual Core Architecture for Cellular Handsets

The exponential growth of the wireless communications industry has created a multitude of new products with advanced features that allow users to stay in touch with every aspect of their lives wherever they may be.

TELECOMUNICAÇÕES

ATD - ATM Traffic.pdf - 94,6 KB
ROCHOL, Juergen, DIEMER, Mouriac Halem, POZZEBON, Silvia. ATD: ATM Traffic Discriminator. In: SECOND LATIN AMERICAN NETWORK AND MANAGEMENT SYMPOSIUM, 2001, Belo Horizonte. Network Management as a Strategy for Evolution and Development. Belo Horizonte: UFMG/ICEx/DCC, 2001. v.1. p.170-181.

Avaliação de Desempenho.pdf - 76,1 KB
AMORIM, Dorian, ROCHOL, Juergen. Avaliação de Desempenho do Protocolo de Adaptação ATM tipo 2 (AAL2). In: XXVII CONFERÊNCIA LATINOAMERICANA DE INFORMÁTICA - CLEI2001, 2001, Mérida - Venezuela. Proceedeings of the XXVII Conferência Latinoamericana de Informática. Mérida, Venezuela: Universidad de Los Andes, 2001. v.1.

Caracterização Adaptativa.pdf - 101 KB
ROCHOL, Juergen, DIEMER, Mouriac Halem, POZZEBON, Silvia. Caracterização Adaptatíva de Fluxos de Tráfego em ATM. In: XXVII CONFERÊNCIA LATINOAMERICANA DE INFORMÁTICA - CLEI2001, 2001, Mérida, Venezuela. Mérida: Universidad de Los Andes, 2001.

Voz sobre IP - 113 KB
SITOLINO, Claudio, ROCHOL, Juergen. Voz sobre IP: Um Estudo Experimental. In: XXVII CONFERÊNCIA LATINOAMERICANA DE INFORMÁTICA - CLEI2001, 2001, Mérida - Venezuela. Proceedings of the XXVII Conferência Latinoamericana de Informática. Mérida - Venezuela: Universidade de Los Andes, 2001. v.1.

Redes Locais sem Fio.pdf - 176 KB
ROCHOL, Juergen, PRANGE, Cristian Ramos. Análise de Desempenho por Simulação da Subcamada MAC do Padrão IEEE 802.11 para Redes Locais sem Fio. In: XVI SIMPÓSIO BRASILEIRO DE REDES DE COMPUTADORES, 1998, Rio de Janeiro RJ. Anais do XVI Simpósio Brasileiro de Redes de Computadores. 1998. p.206-220.

Redes de Banda Larga.pdf - 476 KB
ROCHOL, Juergen. Redes de Banda Larga com Integração de Serviços. In: V ESCOLA REGIONAL DE INFORMÁTICA DA SBC REGIONAL SUL, 1997, Santa Maria RS. Anais da V Escola Regional de Informática da SBC Regional Sul. 1997. p.181-209.

Segurança em Sistemas de Comunicação Pessoal.pdf - 153 KB
ROCHOL, Juergen, GALIANO, Herbert Luna. Segurança em Sistemas de Comunicação Pessoal - Um Estudo Comparativo da Interconexão de Sistemas Heterogeneos. In: XV SIMPÓSIO BRASILEIRO DE REDES DE COMPUTADORES, 1997, São Carlos SP. Anais do XV Simpósio Brasileiro de Redes de Computadores. 1997. p.245-261.

Análise Comparativa dos Sistemas AMPS.pdf - 260 KB
ROCHOL, Juergen, PUFAL, H, BARCELOS, M B. Análise Comparativa dos Sistemas AMPS, TDMA e CDMA de Telefonia Celular Móvel para Serviços de Comunicação de Dados. In: XIII SIMPÓSIO BRASILEIRO DE TELECOMUNICAÇÕES, 1995, Águas de Lindoia SP. 1995. p.557-562.

Comunicação de Dados em Redes Celulares.pdf - 241 KB
ROCHOL, Juergen, BARCELOS, M B, PUFAL, H. Comunicação de Dados em Redes Célulares de Telefonia Móvel (RCTM). In: XIII SIMPÓSIO BRASILEIRO DE REDES DE COMPUTADORES, 1995, Belo Horizonte. Anais XIII SBRC. 1995. p.247-264.

Proposta de um Serviço de Comunicação de Dados.pdf - 169 KB
ROCHOL, Juergen, BOISSON, José Roberto. Proposta de um Serviço de Comunicação de Dados no Sistema DS-CDMA de Telefonia Celular Móvel baseado na IS-95 da EIA?TIA. In: XIII SIMPÓSIO BRASILEIRO DE TELECOMUNICAÇÕES, 1995, Águas de Lindoia SP. Anais do XIII Simpósio Brasileiro de Telecomunicações. 1995. p.137-142.

Conversor de Interface.pdf - 144 KB
ROCHOL, Juergen, AITA, André. Conversor de Interface G.703 de 2,048Mbit/s para Interface V.35 do CCITT. In: XII SIMPÓSIO BRASILEIRO DE REDES DE COMPUTADORES, 1994, Curitiba. 12 SBRC 12o. Simposio Brasileiro de Redes de Computadores. Manoel Camilo de Oliveira Penna Neto, 1994. v.II. p.711-724.

Implementação em EPLDs.pdf - 123 KB
ROCHOL, Juergen, PARISOTO, A M, TERRAZAS, A, BAMPI, Sergio. Implementação de EPLDs de Módulos Integráveis de um Modem Banda Base. In: VIII SIMPÓSIO BRASILEIRO DE CONCEPÇÃO DE CIRCUITOS INTEGRADOS, 1994, Gramado RS. Anais do VIII Simpósio Bradileiro de Concepção de Circuitos Integrados. 1994. p.191-200.